The creation and display of functional images showing where the blood is flowing into the MYOCARDIUM by following over time the distribution of tracers injected into the blood stream.
A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial, sagittal, and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that, unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other, SPECT requires physical collimation to line up the photons, which results in the loss of many available photons and hence degrades the image.
The circulation of blood through the CORONARY VESSELS of the HEART.
Treatment process involving the injection of fluid into an organ or tissue.
A technetium imaging agent used to reveal blood-starved cardiac tissue during a heart attack.
Unstable isotopes of thallium that decay or disintegrate emitting radiation. Tl atoms with atomic weights 198-202, 204, and 206-210 are thallium radioisotopes.
Organic compounds that contain technetium as an integral part of the molecule. These compounds are often used as radionuclide imaging agents.
A phosphodiesterase inhibitor that blocks uptake and metabolism of adenosine by erythrocytes and vascular endothelial cells. Dipyridamole also potentiates the antiaggregating action of prostacyclin. (From AMA Drug Evaluations Annual, 1994, p752)
Compounds that are used in medicine as sources of radiation for radiotherapy and for diagnostic purposes. They have numerous uses in research and industry. (Martindale, The Extra Pharmacopoeia, 30th ed, p1161)
Tomography using single-photon emitting RADIONUCLIDES to create images that are captured in times corresponding to various points in the cardiac cycle.
The hollow, muscular organ that maintains the circulation of the blood.
The creation and display of functional images showing where the blood flow reaches by following the distribution of tracers injected into the blood stream.
Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchronizer or gating device. Analysis of right ventricular function is difficult with this technique; that is best evaluated by first-pass ventriculography (VENTRICULOGRAPHY, FIRST-PASS).
Controlled physical activity which is performed in order to allow assessment of physiological functions, particularly cardiovascular and pulmonary, but also aerobic capacity. Maximal (most intense) exercise is usually required but submaximal exercise is also used.
A disorder of cardiac function caused by insufficient blood flow to the muscle tissue of the heart. The decreased blood flow may be due to narrowing of the coronary arteries (CORONARY ARTERY DISEASE), to obstruction by a thrombus (CORONARY THROMBOSIS), or less commonly, to diffuse narrowing of arterioles and other small vessels within the heart. Severe interruption of the blood supply to the myocardial tissue may result in necrosis of cardiac muscle (MYOCARDIAL INFARCTION).
Unstable isotopes of rubidium that decay or disintegrate emitting radiation. Rb atoms with atomic weights 79-84, and 86-95 are radioactive rubidium isotopes.
Radiography of the vascular system of the heart muscle after injection of a contrast medium.
A heavy, bluish white metal, atomic number 81, atomic weight [204.382; 204.385], symbol Tl.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
Organic compounds that contain phosphorus as an integral part of the molecule. Included under this heading is broad array of synthetic compounds that are used as PESTICIDES and DRUGS.
Unstable isotopes of nitrogen that decay or disintegrate emitting radiation. N atoms with atomic weights 12, 13, 16, 17, and 18 are radioactive nitrogen isotopes.
An imbalance between myocardial functional requirements and the capacity of the CORONARY VESSELS to supply sufficient blood flow. It is a form of MYOCARDIAL ISCHEMIA (insufficient blood supply to the heart muscle) caused by a decreased capacity of the coronary vessels.
A nucleoside that is composed of ADENINE and D-RIBOSE. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter.
Substances used to allow enhanced visualization of tissues.
Generally, restoration of blood supply to heart tissue which is ischemic due to decrease in normal blood supply. The decrease may result from any source including atherosclerotic obstruction, narrowing of the artery, or surgical clamping. Reperfusion can be induced to treat ischemia. Methods include chemical dissolution of an occluding thrombus, administration of vasodilator drugs, angioplasty, catheterization, and artery bypass graft surgery. However, it is thought that reperfusion can itself further damage the ischemic tissue, causing MYOCARDIAL REPERFUSION INJURY.
Binary classification measures to assess test results. Sensitivity or recall rate is the proportion of true positives. Specificity is the probability of correctly determining the absence of a condition. (From Last, Dictionary of Epidemiology, 2d ed)
Tomography using radioactive emissions from injected RADIONUCLIDES and computer ALGORITHMS to reconstruct an image.
Drugs used to cause dilation of the blood vessels.
Any visible result of a procedure which is caused by the procedure itself and not by the entity being analyzed. Common examples include histological structures introduced by tissue processing, radiographic images of structures that are not naturally present in living tissue, and products of chemical reactions that occur during analysis.
The veins and arteries of the HEART.
The ratio of maximum blood flow to the MYOCARDIUM with CORONARY STENOSIS present, to the maximum equivalent blood flow without stenosis. The measurement is commonly used to verify borderline stenosis of CORONARY ARTERIES.
NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).
Radionuclide ventriculography where a bolus of radionuclide is injected and data are recorded from one pass through the heart ventricle. Left and right ventricular function can be analyzed independently during this technique. First-pass ventriculography is preferred over GATED BLOOD-POOL IMAGING for assessing right ventricular function.
The statistical reproducibility of measurements (often in a clinical context), including the testing of instrumentation or techniques to obtain reproducible results. The concept includes reproducibility of physiological measurements, which may be used to develop rules to assess probability or prognosis, or response to a stimulus; reproducibility of occurrence of a condition; and reproducibility of experimental results.
Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.
Improvement of the quality of a picture by various techniques, including computer processing, digital filtering, echocardiographic techniques, light and ultrastructural MICROSCOPY, fluorescence spectrometry and microscopy, scintigraphy, and in vitro image processing at the molecular level.
In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.
The hemodynamic and electrophysiological action of the left HEART VENTRICLE. Its measurement is an important aspect of the clinical evaluation of patients with heart disease to determine the effects of the disease on cardiac performance.
Recording of the moment-to-moment electromotive forces of the HEART as projected onto various sites on the body's surface, delineated as a scalar function of time. The recording is monitored by a tracing on slow moving chart paper or by observing it on a cardioscope, which is a CATHODE RAY TUBE DISPLAY.
Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.
An imaging technique using compounds labelled with short-lived positron-emitting radionuclides (such as carbon-11, nitrogen-13, oxygen-15 and fluorine-18) to measure cell metabolism. It has been useful in study of soft tissues such as CANCER; CARDIOVASCULAR SYSTEM; and brain. SINGLE-PHOTON EMISSION-COMPUTED TOMOGRAPHY is closely related to positron emission tomography, but uses isotopes with longer half-lives and resolution is lower.
Narrowing or constriction of a coronary artery.
A condition in which the LEFT VENTRICLE of the heart was functionally impaired. This condition usually leads to HEART FAILURE; MYOCARDIAL INFARCTION; and other cardiovascular complications. Diagnosis is made by measuring the diminished ejection fraction and a depressed level of motility of the left ventricular wall.
A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.
The muscle tissue of the HEART. It is composed of striated, involuntary muscle cells (MYOCYTES, CARDIAC) connected to form the contractile pump to generate blood flow.
The circulation of the BLOOD through the MICROVASCULAR NETWORK.
A versatile contrast medium used for DIAGNOSTIC X-RAY RADIOLOGY.
A method of recording heart motion and internal structures by combining ultrasonic imaging with exercise testing (EXERCISE TEST) or pharmacologic stress.
A catecholamine derivative with specificity for BETA-1 ADRENERGIC RECEPTORS. It is commonly used as a cardiotonic agent after CARDIAC SURGERY and during DOBUTAMINE STRESS ECHOCARDIOGRAPHY.
The symptom of paroxysmal pain consequent to MYOCARDIAL ISCHEMIA usually of distinctive character, location and radiation. It is thought to be provoked by a transient stressful situation during which the oxygen requirements of the MYOCARDIUM exceed that supplied by the CORONARY CIRCULATION.
A complex of gadolinium with a chelating agent, diethylenetriamine penta-acetic acid (DTPA see PENTETIC ACID), that is given to enhance the image in cranial and spinal MRIs. (From Martindale, The Extra Pharmacopoeia, 30th ed, p706)
Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.
Isotopes that exhibit radioactivity and undergo radioactive decay. (From Grant & Hackh's Chemical Dictionary, 5th ed & McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The amount of BLOOD pumped out of the HEART per beat, not to be confused with cardiac output (volume/time). It is calculated as the difference between the end-diastolic volume and the end-systolic volume.
Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures.
The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)
Tomography using x-ray transmission and a computer algorithm to reconstruct the image.
The presence of an increased amount of blood in a body part or an organ leading to congestion or engorgement of blood vessels. Hyperemia can be due to increase of blood flow into the area (active or arterial), or due to obstruction of outflow of blood from the area (passive or venous).
The span of viability of a tissue or an organ.
The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.
The flow of BLOOD through or around an organ or region of the body.
The measurement of visualization by radiation of any organ after a radionuclide has been injected into its blood supply. It is used to diagnose heart, liver, lung, and other diseases and to measure the function of those organs, except renography, for which RADIOISOTOPE RENOGRAPHY is available.
Tellurium. An element that is a member of the chalcogen family. It has the atomic symbol Te, atomic number 52, and atomic weight 127.60. It has been used as a coloring agent and in the manufacture of electrical equipment. Exposure may cause nausea, vomiting, and CNS depression.
Small uniformly-sized spherical particles, of micrometer dimensions, frequently labeled with radioisotopes or various reagents acting as tags or markers.
Elements of limited time intervals, contributing to particular results or situations.
Freedom from activity.
Electronic instruments that produce photographs or cathode-ray tube images of the gamma-ray emissions from organs containing radionuclide tracers.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
The production of an image obtained by cameras that detect the radioactive emissions of an injected radionuclide as it has distributed differentially throughout tissues in the body. The image obtained from a moving detector is called a scan, while the image obtained from a stationary camera device is called a scintiphotograph.
Compounds that contain the radical R2C=N.OH derived from condensation of ALDEHYDES or KETONES with HYDROXYLAMINE. Members of this group are CHOLINESTERASE REACTIVATORS.
A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.
A type of imaging technique used primarily in the field of cardiology. By coordinating the fast gradient-echo MRI sequence with retrospective ECG-gating, numerous short time frames evenly spaced in the cardiac cycle are produced. These images are laced together in a cinematic display so that wall motion of the ventricles, valve motion, and blood flow patterns in the heart and great vessels can be visualized.
The restoration of blood supply to the myocardium. (From Dorland, 28th ed)
A colorless alkaline gas. It is formed in the body during decomposition of organic materials during a large number of metabolically important reactions. Note that the aqueous form of ammonia is referred to as AMMONIUM HYDROXIDE.
Combination or superimposition of two images for demonstrating differences between them (e.g., radiograph with contrast vs. one without, radionuclide images using different radionuclides, radiograph vs. radionuclide image) and in the preparation of audiovisual materials (e.g., offsetting identical images, coloring of vessels in angiograms).
A specialty field of radiology concerned with diagnostic, therapeutic, and investigative use of radioactive compounds in a pharmaceutical form.
The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).
Maintenance of blood flow to an organ despite obstruction of a principal vessel. Blood flow is maintained through small vessels.
A prediction of the probable outcome of a disease based on a individual's condition and the usual course of the disease as seen in similar situations.
Unstable isotopes of oxygen that decay or disintegrate emitting radiation. O atoms with atomic weights 13, 14, 15, 19, and 20 are radioactive oxygen isotopes.
The first artificially produced element and a radioactive fission product of URANIUM. Technetium has the atomic symbol Tc, atomic number 43, and atomic weight 98.91. All technetium isotopes are radioactive. Technetium 99m (m=metastable) which is the decay product of Molybdenum 99, has a half-life of about 6 hours and is used diagnostically as a radioactive imaging agent. Technetium 99 which is a decay product of technetium 99m, has a half-life of 210,000 years.
Pathological conditions involving the HEART including its structural and functional abnormalities.
ANGINA PECTORIS or angina-like chest pain with a normal coronary arteriogram and positive EXERCISE TEST. The cause of the syndrome is unknown. While its recognition is of clinical importance, its prognosis is excellent. (Braunwald, Heart Disease, 4th ed, p1346; Jablonski Dictionary of Syndromes & Eponymic Diseases, 2d ed). It is different from METABOLIC SYNDROME X, a syndrome characterized by INSULIN RESISTANCE and HYPERINSULINEMIA, that has increased risk for cardiovascular disease.
Pressure, burning, or numbness in the chest.
Liquid perfluorinated carbon compounds which may or may not contain a hetero atom such as nitrogen, oxygen or sulfur, but do not contain another halogen or hydrogen atom. This concept includes fluorocarbon emulsions and fluorocarbon blood substitutes.
A commonly used x-ray contrast medium. As DIATRIZOATE MEGLUMINE and as Diatrizoate sodium, it is used for gastrointestinal studies, angiography, and urography.
Observation of a population for a sufficient number of persons over a sufficient number of years to generate incidence or mortality rates subsequent to the selection of the study group.
Dilation of an occluded coronary artery (or arteries) by means of a balloon catheter to restore myocardial blood supply.
Levels within a diagnostic group which are established by various measurement criteria applied to the seriousness of a patient's disorder.
Devices or objects in various imaging techniques used to visualize or enhance visualization by simulating conditions encountered in the procedure. Phantoms are used very often in procedures employing or measuring x-irradiation or radioactive material to evaluate performance. Phantoms often have properties similar to human tissue. Water demonstrates absorbing properties similar to normal tissue, hence water-filled phantoms are used to map radiation levels. Phantoms are used also as teaching aids to simulate real conditions with x-ray or ultrasonic machines. (From Iturralde, Dictionary and Handbook of Nuclear Medicine and Clinical Imaging, 1990)
Prolonged dysfunction of the myocardium after a brief episode of severe ischemia, with gradual return of contractile activity.
Contractile activity of the MYOCARDIUM.
The qualitative or quantitative estimation of the likelihood of adverse effects that may result from exposure to specified health hazards or from the absence of beneficial influences. (Last, Dictionary of Epidemiology, 1988)
A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.
A graphic means for assessing the ability of a screening test to discriminate between healthy and diseased persons; may also be used in other studies, e.g., distinguishing stimuli responses as to a faint stimuli or nonstimuli.
Hospital department responsible for the administration and management of nuclear medicine services.
Unstable isotopes of fluorine that decay or disintegrate emitting radiation. F atoms with atomic weights 17, 18, and 20-22 are radioactive fluorine isotopes.
Neoplasm drug therapy involving an extracorporeal circuit with temporary exclusion of the tumor-bearing area from the general circulation during which high concentrations of the drug are perfused to the isolated part.
Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.
Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).
The lower right and left chambers of the heart. The right ventricle pumps venous BLOOD into the LUNGS and the left ventricle pumps oxygenated blood into the systemic arterial circulation.
Separation systems containing a relatively long-lived parent radionuclide which produces a short-lived daughter in its decay scheme. The daughter can be periodically extracted (milked) by means of an appropriate eluting agent.
Studies in which individuals or populations are followed to assess the outcome of exposures, procedures, or effects of a characteristic, e.g., occurrence of disease.
Types of spiral computed tomography technology in which multiple slices of data are acquired simultaneously improving the resolution over single slice acquisition technology.
Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.
Markedly reduced or absent REPERFUSION in an infarct zone following the removal of an obstruction or constriction of an artery.
The number of times the HEART VENTRICLES contract per unit of time, usually per minute.
A class of compounds of the type R-M, where a C atom is joined directly to any other element except H, C, N, O, F, Cl, Br, I, or At. (Grant & Hackh's Chemical Dictionary, 5th ed)
PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.
Diseases that do not exhibit symptoms.
Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series.
An aspect of personal behavior or lifestyle, environmental exposure, or inborn or inherited characteristic, which, on the basis of epidemiologic evidence, is known to be associated with a health-related condition considered important to prevent.
Studies used to test etiologic hypotheses in which inferences about an exposure to putative causal factors are derived from data relating to characteristics of persons under study or to events or experiences in their past. The essential feature is that some of the persons under study have the disease or outcome of interest and their characteristics are compared with those of unaffected persons.
Delivery of drugs into an artery.
Agents that have a strengthening effect on the heart or that can increase cardiac output. They may be CARDIAC GLYCOSIDES; SYMPATHOMIMETICS; or other drugs. They are used after MYOCARDIAL INFARCT; CARDIAC SURGICAL PROCEDURES; in SHOCK; or in congestive heart failure (HEART FAILURE).
Computed tomography where there is continuous X-ray exposure to the patient while being transported in a spiral or helical pattern through the beam of irradiation. This provides improved three-dimensional contrast and spatial resolution compared to conventional computed tomography, where data is obtained and computed from individual sequential exposures.
The circulation of blood through the BLOOD VESSELS of the BRAIN.
Theoretical representations that simulate the behavior or activity of the cardiovascular system, processes, or phenomena; includes the use of mathematical equations, computers and other electronic equipment.
A form of heart block in which the electrical stimulation of HEART VENTRICLES is interrupted at either one of the branches of BUNDLE OF HIS thus preventing the simultaneous depolarization of the two ventricles.
Compounds that selectively bind to and activate ADENOSINE A2 RECEPTORS.
A distribution in which a variable is distributed like the sum of the squares of any given independent random variable, each of which has a normal distribution with mean of zero and variance of one. The chi-square test is a statistical test based on comparison of a test statistic to a chi-square distribution. The oldest of these tests are used to detect whether two or more population distributions differ from one another.
Volume of circulating BLOOD. It is the sum of the PLASMA VOLUME and ERYTHROCYTE VOLUME.
The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.
Water-soluble proteins found in egg whites, blood, lymph, and other tissues and fluids. They coagulate upon heating.
Examinations used to diagnose and treat heart conditions.
Radioactive substances added in minute amounts to the reacting elements or compounds in a chemical process and traced through the process by appropriate detection methods, e.g., Geiger counter. Compounds containing tracers are often said to be tagged or labeled. (Hawley's Condensed Chemical Dictionary, 12th ed)
A group of diseases in which the dominant feature is the involvement of the CARDIAC MUSCLE itself. Cardiomyopathies are classified according to their predominant pathophysiological features (DILATED CARDIOMYOPATHY; HYPERTROPHIC CARDIOMYOPATHY; RESTRICTIVE CARDIOMYOPATHY) or their etiological/pathological factors (CARDIOMYOPATHY, ALCOHOLIC; ENDOCARDIAL FIBROELASTOSIS).
A technique for assisting the circulation by decreasing the afterload of the left ventricle and augmenting the diastolic pressure. It may be achieved by intra-aortic balloon, or by implanting a special pumping device in the chest, or externally by applying a negative pressure to the lower extremities during cardiac systole.
A congenital cardiovascular malformation in which the AORTA arises entirely from the RIGHT VENTRICLE, and the PULMONARY ARTERY arises from the LEFT VENTRICLE. Consequently, the pulmonary and the systemic circulations are parallel and not sequential, so that the venous return from the peripheral circulation is re-circulated by the right ventricle via aorta to the systemic circulation without being oxygenated in the lungs. This is a potentially lethal form of heart disease in newborns and infants.
Computer systems or networks designed to provide radiographic interpretive information.
Irreversible cessation of all bodily functions, manifested by absence of spontaneous breathing and total loss of cardiovascular and cerebral functions.
Genetically developed small pigs for use in biomedical research. There are several strains - Yucatan miniature, Sinclair miniature, and Minnesota miniature.
A plant species of the family POLYGONACEAE. Itadori tea is prepared from the root of this genus.
Positive test results in subjects who do not possess the attribute for which the test is conducted. The labeling of healthy persons as diseased when screening in the detection of disease. (Last, A Dictionary of Epidemiology, 2d ed)
The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.
Computer programs based on knowledge developed from consultation with experts on a problem, and the processing and/or formalizing of this knowledge using these programs in such a manner that the problems may be solved.
The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.
Measurement of intracardiac blood flow using an M-mode and/or two-dimensional (2-D) echocardiogram while simultaneously recording the spectrum of the audible Doppler signal (e.g., velocity, direction, amplitude, intensity, timing) reflected from the moving column of red blood cells.
The physiological widening of BLOOD VESSELS by relaxing the underlying VASCULAR SMOOTH MUSCLE.
Small encapsulated gas bubbles (diameters of micrometers) that can be used as CONTRAST MEDIA, and in other diagnostic and therapeutic applications. Upon exposure to sufficiently intense ultrasound, microbubbles will cavitate, rupture, disappear, release gas content. Such characteristics of the microbubbles can be used to enhance diagnostic tests, dissolve blood clots, and deliver drugs or genes for therapy.
Statistical models used in survival analysis that assert that the effect of the study factors on the hazard rate in the study population is multiplicative and does not change over time.
Imaging of a ventricle of the heart after the injection of a radioactive contrast medium. The technique is less invasive than cardiac catheterization and is used to assess ventricular function.
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
Surgical therapy of ischemic coronary artery disease achieved by grafting a section of saphenous vein, internal mammary artery, or other substitute between the aorta and the obstructed coronary artery distal to the obstructive lesion.
A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).
A conical fibro-serous sac surrounding the HEART and the roots of the great vessels (AORTA; VENAE CAVAE; PULMONARY ARTERY). Pericardium consists of two sacs: the outer fibrous pericardium and the inner serous pericardium. The latter consists of an outer parietal layer facing the fibrous pericardium, and an inner visceral layer (epicardium) resting next to the heart, and a pericardial cavity between these two layers.
A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.
VASCULAR DISEASES that are associated with DIABETES MELLITUS.
The compound is given by intravenous injection to do POSITRON-EMISSION TOMOGRAPHY for the assessment of cerebral and myocardial glucose metabolism in various physiological or pathological states including stroke and myocardial ischemia. It is also employed for the detection of malignant tumors including those of the brain, liver, and thyroid gland. (From Martindale, The Extra Pharmacopoeia, 30th ed, p1162)
The study of the heart, its physiology, and its functions.
Period of contraction of the HEART, especially of the HEART VENTRICLES.
The posture of an individual lying face down.
A nonparametric method of compiling LIFE TABLES or survival tables. It combines calculated probabilities of survival and estimates to allow for observations occurring beyond a measurement threshold, which are assumed to occur randomly. Time intervals are defined as ending each time an event occurs and are therefore unequal. (From Last, A Dictionary of Epidemiology, 1995)
Sulfur hexafluoride. An inert gas used mainly as a test gas in respiratory physiology. Other uses include its injection in vitreoretinal surgery to restore the vitreous chamber and as a tracer in monitoring the dispersion and deposition of air pollutants.
A set of techniques used when variation in several variables has to be studied simultaneously. In statistics, multivariate analysis is interpreted as any analytic method that allows simultaneous study of two or more dependent variables.
A method of producing a high-quality scan by digitizing and subtracting the images produced by high- and low-energy x-rays.
The amount of radiation energy that is deposited in a unit mass of material, such as tissues of plants or animal. In RADIOTHERAPY, radiation dosage is expressed in gray units (Gy). In RADIOLOGIC HEALTH, the dosage is expressed by the product of absorbed dose (Gy) and quality factor (a function of linear energy transfer), and is called radiation dose equivalent in sievert units (Sv).
The minute vessels that connect the arterioles and venules.
The ratio of alveolar ventilation to simultaneous alveolar capillary blood flow in any part of the lung. (Stedman, 25th ed)
The unfavorable effect of environmental factors (stressors) on the physiological functions of an organism. Prolonged unresolved physiological stress can affect HOMEOSTASIS of the organism, and may lead to damaging or pathological conditions.
Radiography of blood vessels after injection of a contrast medium.
The long-term (minutes to hours) administration of a fluid into the vein through venipuncture, either by letting the fluid flow by gravity or by pumping it.
A hypoperfusion of the BLOOD through an organ or tissue caused by a PATHOLOGIC CONSTRICTION or obstruction of its BLOOD VESSELS, or an absence of BLOOD CIRCULATION.
The innermost layer of the heart, comprised of endothelial cells.
An isoenzyme of creatine kinase found in the CARDIAC MUSCLE.
The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
The hemodynamic and electrophysiological action of the HEART VENTRICLES.
Gadolinium. An element of the rare earth family of metals. It has the atomic symbol Gd, atomic number 64, and atomic weight 157.25. Its oxide is used in the control rods of some nuclear reactors.
A form of CARDIAC MUSCLE disease that is characterized by ventricular dilation, VENTRICULAR DYSFUNCTION, and HEART FAILURE. Risk factors include SMOKING; ALCOHOL DRINKING; HYPERTENSION; INFECTION; PREGNANCY; and mutations in the LMNA gene encoding LAMIN TYPE A, a NUCLEAR LAMINA protein.
Establishment of the level of a quantifiable effect indicative of a biologic process. The evaluation is frequently to detect the degree of toxic or therapeutic effect.
Conditions or pathological processes associated with the disease of diabetes mellitus. Due to the impaired control of BLOOD GLUCOSE level in diabetic patients, pathological processes develop in numerous tissues and organs including the EYE, the KIDNEY, the BLOOD VESSELS, and the NERVE TISSUE.
Organic compounds containing the -CN radical. The concept is distinguished from CYANIDES, which denotes inorganic salts of HYDROGEN CYANIDE.
A method of non-invasive, continuous measurement of MICROCIRCULATION. The technique is based on the values of the DOPPLER EFFECT of low-power laser light scattered randomly by static structures and moving tissue particulates.
Agents that affect the rate or intensity of cardiac contraction, blood vessel diameter, or blood volume.
A family of percutaneous techniques that are used to manage CORONARY OCCLUSION, including standard balloon angioplasty (PERCUTANEOUS TRANSLUMINAL CORONARY ANGIOPLASTY), the placement of intracoronary STENTS, and atheroablative technologies (e.g., ATHERECTOMY; ENDARTERECTOMY; THROMBECTOMY; PERCUTANEOUS TRANSLUMINAL LASER ANGIOPLASTY). PTCA was the dominant form of PCI, before the widespread use of stenting.
A non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiological procedures.
A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include ADENINE and GUANINE, constituents of nucleic acids, as well as many alkaloids such as CAFFEINE and THEOPHYLLINE. Uric acid is the metabolic end product of purine metabolism.
Post-systolic relaxation of the HEART, especially the HEART VENTRICLES.
Improvement in the quality of an x-ray image by use of an intensifying screen, tube, or filter and by optimum exposure techniques. Digital processing methods are often employed.
Studies determining the effectiveness or value of processes, personnel, and equipment, or the material on conducting such studies. For drugs and devices, CLINICAL TRIALS AS TOPIC; DRUG EVALUATION; and DRUG EVALUATION, PRECLINICAL are available.
A condition in which HEART VENTRICLES exhibit impaired function.
Small-scale tests of methods and procedures to be used on a larger scale if the pilot study demonstrates that these methods and procedures can work.
A guanidine analog with specific affinity for tissues of the sympathetic nervous system and related tumors. The radiolabeled forms are used as antineoplastic agents and radioactive imaging agents. (Merck Index, 12th ed) MIBG serves as a neuron-blocking agent which has a strong affinity for, and retention in, the adrenal medulla and also inhibits ADP-ribosyltransferase.
Expenditure of energy during PHYSICAL ACTIVITY. Intensity of exertion may be measured by rate of OXYGEN CONSUMPTION; HEAT produced, or HEART RATE. Perceived exertion, a psychological measure of exertion, is included.
A volatile vasodilator which relieves ANGINA PECTORIS by stimulating GUANYLATE CYCLASE and lowering cytosolic calcium. It is also sometimes used for TOCOLYSIS and explosives.
A noble gas with the atomic symbol Xe, atomic number 54, and atomic weight 131.30. It is found in the earth's atmosphere and has been used as an anesthetic.
Molecules which contain an atom or a group of atoms exhibiting an unpaired electron spin that can be detected by electron spin resonance spectroscopy and can be bonded to another molecule. (McGraw-Hill Dictionary of Chemical and Technical Terms, 4th ed)
An effective non-ionic, water-soluble contrast agent which is used in myelography, arthrography, nephroangiography, arteriography, and other radiographic procedures. Its low systemic toxicity is the combined result of low chemotoxicity and low osmolality.
The condition of an anatomical structure's being dilated beyond normal dimensions.
A type of MAGNETIC RESONANCE IMAGING that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications.
Inorganic or organic compounds derived from phosphine (PH3) by the replacement of H atoms. (From Grant & Hackh's Chemical Dictionary, 5th ed)
The condition of an anatomical structure's being constricted beyond normal dimensions.
Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.
Disease having a short and relatively severe course.
Use of infusions of FIBRINOLYTIC AGENTS to destroy or dissolve thrombi in blood vessels or bypass grafts.
The posture of an individual lying face up.
The use of combination of imaging techniques or platforms (e.g., MRI SCAN and PET SCAN) encompassing aspects of anatomical, functional, or molecular imaging methods.
Triiodo-substituted derivatives of BENZOIC ACID.

Predicting breast attenuation in patients undergoing myocardial perfusion scintigraphy: a digital x-ray study. (1/557)

Attenuation artifacts are the most common sources of error in myocardial single-photon emission computed tomography (SPECT) imaging. Breast artifacts are the most frequent causes of false positive planar images in female subjects. The purpose of this study was to predict breast adverse attenuation by measuring breast tissue thickness with digital x-ray. Sixty-five consecutive female patients with angina pectoris, who were referred to myocardial perfusion scintigraphy were enrolled in this study. Eighteen patients with normal perfusion imaging and normal coronary angiography composed the first group, whereas the second group consisted of 28 patients with a positive exercise electrocardiogram with anterior ischemia on myocardial perfusion imaging and greater than 50% left anterior descending artery stenosis on angiography. Nineteen patients in the third group had normal exercise electrocardiograms and normal coronary angiographies, but anterior ischemia on perfusion imaging. Digital x-ray records were obtained for measuring breast tissue thickness and Hounsfield density. The rate of breast adverse attenuation was 40% (19/47) in patients with anterior ischemia. The sensitivity and specificity of the prediction of breast adverse attenuation (lateral density less than 550 Hounsfield) were 79% and 11%, respectively. When breast attenuation for a breast thickness greater than 6 cm measured in the left anterior oblique view was predicted, the sensitivity and specificity were 79% and 93%, respectively. In conclusion, breast thickness greater than 6 cm measured from the left anterior oblique view with digital x-ray can predict breast adverse attenuation in female patients, and thereby may decrease the number of unnecessary invasive diagnostic procedures to be performed.  (+info)

Left ventricular dyssynchrony assessed by two three-dimensional imaging modalities: phase analysis of gated myocardial perfusion SPECT and tri-plane tissue Doppler imaging. (2/557)

PURPOSE: To compare left ventricular (LV) dyssynchrony assessment by phase analysis from gated myocardial perfusion SPECT (GMPS) with LV dyssynchrony assessment by tri-plane tissue Doppler imaging (TDI). Baseline LV dyssynchrony assessed with standard deviation (SD) of time-to-peak systolic velocity of 12 LV segments (Ts-SD) with TDI has proven to be a powerful predictor of response to CRT. Information on LV dyssynchrony can also be provided by GMPS with phase analysis of regional LV maximal count changes throughout the cardiac cycle. METHODS: Forty heart failure patients, referred for evaluation of potential eligibility for CRT, underwent both 3D echocardiography, with tri-plane TDI, and resting GMPS. From tri-plane TDI, Ts-SD was used as a validated parameter of LV dyssynchrony and compared with different indices (histogram bandwidth, phase SD, histogram skewness and kurtosis) derived from phase analysis of GMPS. RESULTS: Histogram bandwidth and phase SD showed good correlation with Ts-SD (r=0.77 and r=0.74, p<0.0001, respectively). Patients with substantial LV dyssynchrony assessed with tri-plane TDI (Ts-SD >or=33 ms) had also significantly higher values of histogram bandwidth and phase SD. CONCLUSIONS: The results of this study support the use of phase analysis by GMPS to evaluate LV dyssynchrony. Histogram bandwidth and phase SD showed the best correlation with Ts-SD assessed with tri-plane TDI and appeared the most optimal variables for assessment of LV dyssynchrony with GMPS.  (+info)

(99m)Tc-sestamibi uptake in rat skeletal muscle and heart: physiological determinants and correlations. (3/557)

The lipophilic cationic radiotracer (99m)Tc-sestamibi, known to be concentrated within mitochondria, is widely used for myocardial perfusion and to a lesser extent for muscle metabolism imaging. However, the exact distribution pattern in skeletal muscle has not been yet studied in detail. The present study aims to investigate the (99m)Tc-sestamibi uptake in rat skeletal muscle and myocardium in relation to their metabolic characteristics. (99m)Tc-sestamibi was i.v. administered in twenty adult male Wistar rats and uptake, as percent of injected dose per tissue gram (%ID/g), in the myocardium, soleus, extensor digitorum longus and gastrocnemius muscles was assessed 2 h after the injection. Muscle uptake was also correlated with myocardial uptake, muscle weight and body weight. Skeletal muscle (99m)Tc-sestamibi uptake was a small (9-16 %) fraction of that found in myocardium (1.71+/-0.63 %ID/g). Among the three hindlimb muscles considered, the slow-oxidative soleus muscle showed the highest uptake (0.28+/-0.16 %ID/g). Metabolically diverse parts of the gastrocnemius muscle showed different uptake. Skeletal muscle uptake was positively correlated with myocardial uptake and both were negatively correlated with tissue and body weight. Skeletal muscle and myocardium (99m)Tc-sestamibi uptake is related to their metabolic profile. Myocardium, with an exceptional rich mitochondrial concentration, shows much higher (99m)Tc-sestamibi uptake compared to skeletal muscles. Among muscles, uptake is dependent on their mitochondrial content. Evidence of matching exists between myocardial and muscle uptake, and both are size-dependent.  (+info)

Direct comparison between pharmacological stress with adenosine triphosphate disodium and exercise stress myocardial perfusion imagings. (4/557)

 (+info)

High spatial resolution myocardial perfusion cardiac magnetic resonance for the detection of coronary artery disease. (5/557)

 (+info)

Low-flow perfusion of guinea pig isolated hearts with 26 degrees C air-saturated Lifor solution for 20 hours preserves function and metabolism. (6/557)

 (+info)

Semi-automated analysis of dynamic changes in myocardial contrast from real-time three-dimensional echocardiographic images as a basis for volumetric quantification of myocardial perfusion. (7/557)

 (+info)

Recurrent myocardial infarction in a young football player with antithrombin III deficiency. (8/557)

Acute myocardial infarction is a rare condition in young athletes. One of the causes could be a hypercoagulable state due to congenital antithrombin III deficiency, together with a prothrombotic state soon after strenuous physical training. We present the case of myocardial reinfarction in young football player with antithrombin III deficiency, treated with primary percutaneous coronary intervention and drug eluting stent, as well as the functional repercussions of continuous intensive physical activity.  (+info)

Myocardial ischemia can be caused by a variety of factors, including coronary artery disease, high blood pressure, diabetes, and smoking. It can also be triggered by physical exertion or stress.

There are several types of myocardial ischemia, including:

1. Stable angina: This is the most common type of myocardial ischemia, and it is characterized by a predictable pattern of chest pain that occurs during physical activity or emotional stress.
2. Unstable angina: This is a more severe type of myocardial ischemia that can occur without any identifiable trigger, and can be accompanied by other symptoms such as shortness of breath or vomiting.
3. Acute coronary syndrome (ACS): This is a condition that includes both stable angina and unstable angina, and it is characterized by a sudden reduction in blood flow to the heart muscle.
4. Heart attack (myocardial infarction): This is a type of myocardial ischemia that occurs when the blood flow to the heart muscle is completely blocked, resulting in damage or death of the cardiac tissue.

Myocardial ischemia can be diagnosed through a variety of tests, including electrocardiograms (ECGs), stress tests, and imaging studies such as echocardiography or cardiac magnetic resonance imaging (MRI). Treatment options for myocardial ischemia include medications such as nitrates, beta blockers, and calcium channel blockers, as well as lifestyle changes such as quitting smoking, losing weight, and exercising regularly. In severe cases, surgical procedures such as coronary artery bypass grafting or angioplasty may be necessary.

The buildup of plaque in the coronary arteries is often caused by high levels of low-density lipoprotein (LDL) cholesterol, smoking, high blood pressure, diabetes, and a family history of heart disease. The plaque can also rupture, causing a blood clot to form, which can completely block the flow of blood to the heart muscle, leading to a heart attack.

CAD is the most common type of heart disease and is often asymptomatic until a serious event occurs. Risk factors for CAD include:

* Age (men over 45 and women over 55)
* Gender (men are at greater risk than women, but women are more likely to die from CAD)
* Family history of heart disease
* High blood pressure
* High cholesterol
* Diabetes
* Smoking
* Obesity
* Lack of exercise

Diagnosis of CAD typically involves a physical exam, medical history, and results of diagnostic tests such as:

* Electrocardiogram (ECG or EKG)
* Stress test
* Echocardiogram
* Coronary angiography

Treatment for CAD may include lifestyle changes such as a healthy diet, regular exercise, stress management, and quitting smoking. Medications such as beta blockers, ACE inhibitors, and statins may also be prescribed to manage symptoms and slow the progression of the disease. In severe cases, surgical intervention such as coronary artery bypass grafting (CABG) or percutaneous coronary intervention (PCI) may be necessary.

Prevention of CAD includes managing risk factors such as high blood pressure, high cholesterol, and diabetes, quitting smoking, maintaining a healthy weight, and getting regular exercise. Early detection and treatment of CAD can help to reduce the risk of complications and improve quality of life for those affected by the disease.

Coronary disease is often caused by a combination of genetic and lifestyle factors, such as high blood pressure, high cholesterol levels, smoking, obesity, and a lack of physical activity. It can also be triggered by other medical conditions, such as diabetes and kidney disease.

The symptoms of coronary disease can vary depending on the severity of the condition, but may include:

* Chest pain or discomfort (angina)
* Shortness of breath
* Fatigue
* Swelling of the legs and feet
* Pain in the arms and back

Coronary disease is typically diagnosed through a combination of physical examination, medical history, and diagnostic tests such as electrocardiograms (ECGs), stress tests, and cardiac imaging. Treatment for coronary disease may include lifestyle changes, medications to control symptoms, and surgical procedures such as angioplasty or bypass surgery to improve blood flow to the heart.

Preventative measures for coronary disease include:

* Maintaining a healthy diet and exercise routine
* Quitting smoking and limiting alcohol consumption
* Managing high blood pressure, high cholesterol levels, and other underlying medical conditions
* Reducing stress through relaxation techniques or therapy.

There are different types of myocardial infarctions, including:

1. ST-segment elevation myocardial infarction (STEMI): This is the most severe type of heart attack, where a large area of the heart muscle is damaged. It is characterized by a specific pattern on an electrocardiogram (ECG) called the ST segment.
2. Non-ST-segment elevation myocardial infarction (NSTEMI): This type of heart attack is less severe than STEMI, and the damage to the heart muscle may not be as extensive. It is characterized by a smaller area of damage or a different pattern on an ECG.
3. Incomplete myocardial infarction: This type of heart attack is when there is some damage to the heart muscle but not a complete blockage of blood flow.
4. Collateral circulation myocardial infarction: This type of heart attack occurs when there are existing collateral vessels that bypass the blocked coronary artery, which reduces the amount of damage to the heart muscle.

Symptoms of a myocardial infarction can include chest pain or discomfort, shortness of breath, lightheadedness, and fatigue. These symptoms may be accompanied by anxiety, fear, and a sense of impending doom. In some cases, there may be no noticeable symptoms at all.

Diagnosis of myocardial infarction is typically made based on a combination of physical examination findings, medical history, and diagnostic tests such as an electrocardiogram (ECG), cardiac enzyme tests, and imaging studies like echocardiography or cardiac magnetic resonance imaging.

Treatment of myocardial infarction usually involves medications to relieve pain, reduce the amount of work the heart has to do, and prevent further damage to the heart muscle. These may include aspirin, beta blockers, ACE inhibitors or angiotensin receptor blockers, and statins. In some cases, a procedure such as angioplasty or coronary artery bypass surgery may be necessary to restore blood flow to the affected area.

Prevention of myocardial infarction involves managing risk factors such as high blood pressure, high cholesterol, smoking, diabetes, and obesity. This can include lifestyle changes such as a healthy diet, regular exercise, and stress reduction, as well as medications to control these conditions. Early detection and treatment of heart disease can help prevent myocardial infarction from occurring in the first place.

The severity of coronary stenosis can range from mild to severe, with blockages ranging from 15% to over 90%. In mild cases, lifestyle changes and medication may be enough to manage symptoms. However, more severe cases typically require interventional procedures such as angioplasty or bypass surgery to improve blood flow to the heart.

There are several potential causes of LVD, including:

1. Coronary artery disease: The buildup of plaque in the coronary arteries can lead to a heart attack, which can damage the left ventricle and impair its ability to function properly.
2. Heart failure: When the heart is unable to pump enough blood to meet the body's needs, it can lead to LVD.
3. Cardiomyopathy: This is a condition where the heart muscle becomes weakened or enlarged, leading to impaired function of the left ventricle.
4. Heart valve disease: Problems with the heart valves can disrupt the normal flow of blood and cause LVD.
5. Hypertension: High blood pressure can cause damage to the heart muscle and lead to LVD.
6. Genetic factors: Some people may be born with genetic mutations that predispose them to developing LVD.
7. Viral infections: Certain viral infections, such as myocarditis, can inflame and damage the heart muscle, leading to LVD.
8. Alcohol or drug abuse: Substance abuse can damage the heart muscle and lead to LVD.
9. Nutritional deficiencies: A diet lacking essential nutrients can lead to damage to the heart muscle and increase the risk of LVD.

Diagnosis of LVD typically involves a physical exam, medical history, and results of diagnostic tests such as electrocardiograms (ECGs), echocardiograms, and stress tests. Treatment options for LVD depend on the underlying cause, but may include medications to improve cardiac function, lifestyle changes, and in severe cases, surgery or other procedures.

Preventing LVD involves taking steps to maintain a healthy heart and reducing risk factors such as high blood pressure, smoking, and obesity. This can be achieved through a balanced diet, regular exercise, stress management, and avoiding substance abuse. Early detection and treatment of underlying conditions that increase the risk of LVD can also help prevent the condition from developing.

Angina pectoris is a medical condition that is characterized by recurring chest pain or discomfort due to reduced blood flow and oxygen supply to the heart muscle, specifically the myocardium. It is also known as stable angina or effort angina. The symptoms of angina pectoris typically occur during physical activity or emotional stress and are relieved by rest.

The term "angina" comes from the Latin word for "strangulation," which refers to the feeling of tightness or constriction in the chest that is associated with the condition. Angina pectoris can be caused by atherosclerosis, or the buildup of plaque in the coronary arteries, which supply blood to the heart muscle. This buildup can lead to the formation of atherosclerotic plaques that can narrow the coronary arteries and reduce blood flow to the heart muscle, causing chest pain.

There are several types of angina pectoris, including:

1. Stable angina: This is the most common type of angina and is characterized by predictable and reproducible symptoms that occur during specific situations or activities, such as exercise or emotional stress.
2. Unstable angina: This type of angina is characterized by unpredictable and changing symptoms that can occur at rest or with minimal exertion. It is often a sign of a more severe underlying condition, such as a heart attack.
3. Variant angina: This type of angina occurs during physical activity, but the symptoms are not relieved by rest.
4. Prinzmetal's angina: This is a rare type of angina that occurs at rest and is characterized by a feeling of tightness or constriction in the chest.

The diagnosis of angina pectoris is typically made based on a combination of physical examination, medical history, and diagnostic tests such as electrocardiogram (ECG), stress test, and imaging studies. Treatment for angina pectoris usually involves lifestyle modifications, such as regular exercise, a healthy diet, and stress management, as well as medications to relieve symptoms and reduce the risk of complications. In some cases, surgery or other procedures may be necessary to treat the underlying condition causing the angina.

In some cases, hyperemia can be a sign of a more serious underlying condition that requires medical attention. For example, if hyperemia is caused by an inflammatory or infectious process, it may lead to tissue damage or organ dysfunction if left untreated.

Hyperemia can occur in various parts of the body, including the skin, muscles, organs, and other tissues. It is often diagnosed through physical examination and imaging tests such as ultrasound, computed tomography (CT), or magnetic resonance imaging (MRI). Treatment for hyperemia depends on its underlying cause, and may include antibiotics, anti-inflammatory medications, or surgery.

In the context of dermatology, hyperemia is often used to describe a condition called erythema, which is characterized by redness and swelling of the skin due to increased blood flow. Erythema can be caused by various factors, such as sun exposure, allergic reactions, or skin infections. Treatment for erythema may include topical medications, oral medications, or other therapies depending on its underlying cause.

There are many different types of heart diseases, including:

1. Coronary artery disease: The buildup of plaque in the coronary arteries, which supply blood to the heart muscle, leading to chest pain or a heart attack.
2. Heart failure: When the heart is unable to pump enough blood to meet the body's needs, leading to fatigue, shortness of breath, and swelling in the legs.
3. Arrhythmias: Abnormal heart rhythms, such as atrial fibrillation or ventricular tachycardia, which can cause palpitations, dizziness, and shortness of breath.
4. Heart valve disease: Problems with the heart valves, which can lead to blood leaking back into the chambers or not being pumped effectively.
5. Cardiomyopathy: Disease of the heart muscle, which can lead to weakened heart function and heart failure.
6. Heart murmurs: Abnormal sounds heard during a heartbeat, which can be caused by defects in the heart valves or abnormal blood flow.
7. Congenital heart disease: Heart defects present at birth, such as holes in the heart or abnormal blood vessels.
8. Myocardial infarction (heart attack): Damage to the heart muscle due to a lack of oxygen, often caused by a blockage in a coronary artery.
9. Cardiac tamponade: Fluid accumulation around the heart, which can cause compression of the heart and lead to cardiac arrest.
10. Endocarditis: Infection of the inner lining of the heart, which can cause fever, fatigue, and heart valve damage.

Heart diseases can be diagnosed through various tests such as electrocardiogram (ECG), echocardiogram, stress test, and blood tests. Treatment options depend on the specific condition and may include lifestyle changes, medication, surgery, or a combination of these.

The symptoms of microvascular angina are similar to those of stable angina, including chest pain or discomfort, shortness of breath, and fatigue. However, microvascular angina episodes can be more frequent and unpredictable than stable angina, and may occur at rest or with minimal exertion.

The diagnosis of microvascular angina is based on a combination of clinical symptoms, physical examination findings, and diagnostic tests such as electrocardiography (ECG), echocardiography, and coronary angiography. Treatment for microvascular angina typically involves medications to relax the blood vessels and improve blood flow to the heart, as well as lifestyle changes such as regular exercise and a healthy diet. In severe cases, surgical intervention may be necessary.

Microvascular angina is considered a syndrome rather than a disease, and it is believed to be caused by a combination of genetic and environmental factors, including smoking, high blood pressure, and high cholesterol levels. It is more common in people who are middle-aged or older, and affects men and women equally.

Overall, microvascular angina is a serious condition that can have a significant impact on quality of life, and it is important for individuals who experience symptoms to seek medical attention to receive an accurate diagnosis and appropriate treatment. With proper management, many people with microvascular angina are able to lead active and fulfilling lives.

There are several possible causes of chest pain, including:

1. Coronary artery disease: The most common cause of chest pain is coronary artery disease, which occurs when the coronary arteries that supply blood to the heart become narrowed or blocked. This can lead to a heart attack if the blood flow to the heart muscle is severely reduced.
2. Heart attack: A heart attack occurs when the heart muscle becomes damaged or dies due to a lack of oxygen and nutrients. This can cause severe chest pain, as well as other symptoms such as shortness of breath, lightheadedness, and fatigue.
3. Acute coronary syndrome: This is a group of conditions that occur when the blood flow to the heart muscle is suddenly blocked or reduced, leading to chest pain or discomfort. In addition to heart attack, acute coronary syndrome can include unstable angina and non-ST-segment elevation myocardial infarction (NSTEMI).
4. Pulmonary embolism: A pulmonary embolism occurs when a blood clot forms in the lungs and blocks the flow of blood to the heart, causing chest pain and shortness of breath.
5. Pneumonia: An infection of the lungs can cause chest pain, fever, and difficulty breathing.
6. Costochondritis: This is an inflammation of the cartilage that connects the ribs to the breastbone (sternum), which can cause chest pain and tenderness.
7. Tietze's syndrome: This is a condition that occurs when the cartilage and muscles in the chest are injured, leading to chest pain and swelling.
8. Heart failure: When the heart is unable to pump enough blood to meet the body's needs, it can cause chest pain, shortness of breath, and fatigue.
9. Pericarditis: An inflammation of the membrane that surrounds the heart (pericardium) can cause chest pain, fever, and difficulty breathing.
10. Precordial catch syndrome: This is a condition that occurs when the muscles and tendons between the ribs become inflamed, causing chest pain and tenderness.

These are just a few of the many possible causes of chest pain. If you are experiencing chest pain, it is important to seek medical attention right away to determine the cause and receive proper treatment.

During myocardial stunning, the heart muscle cells experience a temporary reduction in contractility and an increase in the amount of lactic acid produced. This can lead to symptoms such as chest pain, shortness of breath, and fatigue. In severe cases, myocardial stunning can progress to myocardial infarction (heart attack) or cardiac arrest.

Myocardial stunning is often seen in athletes who engage in intense exercise, such as marathon runners or professional football players. It can also occur in people with pre-existing heart conditions, such as coronary artery disease or hypertension.

Treatment of myocardial stunning typically involves addressing the underlying cause, such as reducing stress on the heart or improving blood flow to the myocardium. In severe cases, medications such as nitrates or beta blockers may be used to reduce the workload on the heart and improve contractility. In some cases, hospitalization may be necessary to monitor the condition and provide appropriate treatment.

Prevention of myocardial stunning involves taking steps to reduce the risk factors for heart disease, such as maintaining a healthy diet, exercising regularly, and managing stress. It is also important to seek medical attention if symptoms of myocardial stunning are present, as prompt treatment can help prevent more severe complications.

The "no-reflow" phenomenon is defined as the absence of hyperemia (increased blood flow) in the myocardium after successful reperfusion therapy, which includes primary percutaneous coronary intervention (PCI) or thrombolysis. It is characterized by a decrease in the size of the infarct area, but not complete resolution of the infarction.

The no-reflow phenomenon can be diagnosed using various techniques such as echocardiography, cardiac magnetic resonance imaging (MRI), and single-photon emission computed tomography (SPECT) myocardial perfusion imaging. Treatment for the no-reflow phenomenon is aimed at addressing the underlying cause, such as managing blood pressure, controlling blood sugar levels, and administering medications to reduce inflammation and improve coronary blood flow.

In summary, the no-reflow phenomenon is a complex condition that can occur after reperfusion therapy, characterized by reduced or absent blood flow to certain areas of the heart muscle despite adequate perfusion pressure. Prompt diagnosis and appropriate treatment are essential to prevent further damage and improve outcomes in patients with this condition.

The term "asymptomatic" means "not showing symptoms."

In medical terminology, the word asymptomatic is used to describe a person who has a disease or condition but does not show any symptoms. Symptoms are changes in the body or mind that indicate the presence of a disease or condition. For example, fever, pain, and fatigue are all symptoms of an infection.

Asymptomatic diseases can be difficult to diagnose because they do not cause any noticeable symptoms. In many cases, these diseases are only discovered through routine medical testing or exams. For example, a person may have high blood pressure without knowing it, as there are usually no noticeable symptoms until the condition is advanced.

The importance of screening tests and early diagnosis

Screening tests are medical tests that are performed on people who do not have any symptoms of a disease or condition. These tests are designed to detect diseases or conditions before they cause any noticeable symptoms. Examples of screening tests include blood pressure checks, cholesterol tests, mammograms, and colonoscopies.

Early diagnosis is critical for successfully treating many asymptomatic diseases. When a disease or condition is detected early, it can be treated more effectively before it causes any significant damage. In some cases, early diagnosis may even prevent the development of complications.

The importance of screening tests and early diagnosis cannot be overstated. By detecting diseases or conditions before they cause symptoms, individuals can receive treatment before any long-term damage occurs. This can help to improve their quality of life, increase their lifespan, and reduce the risk of complications.

The importance of screening tests and early diagnosis is particularly important for certain populations, such as older adults or those with a family history of certain diseases or conditions. These individuals may be at a higher risk for developing certain asymptomatic diseases, and screening tests can help to detect these conditions before they cause any noticeable symptoms.

The benefits of early diagnosis include:

1. Improved treatment outcomes: When a disease or condition is detected early, it can be treated more effectively before it causes any significant damage. This can improve the chances of successful treatment and reduce the risk of complications.
2. Prevention of long-term damage: By detecting diseases or conditions before they cause any noticeable symptoms, individuals can receive treatment before any long-term damage occurs. This can help to preserve their quality of life and increase their lifespan.
3. Reduced healthcare costs: Early diagnosis can reduce healthcare costs by preventing the need for more expensive treatments or hospitalizations that may be required if a condition is allowed to progress untreated.
4. Increased awareness: Screening tests and early diagnosis can increase awareness of certain diseases or conditions, which can lead to increased education and advocacy efforts aimed at prevention and treatment.
5. Improved patient outcomes: Early diagnosis can lead to improved patient outcomes by allowing for earlier intervention and treatment, which can improve the chances of successful treatment and reduce the risk of complications.
6. Reduced suffering: By detecting diseases or conditions before they cause any noticeable symptoms, individuals can receive treatment before they experience any unnecessary suffering.
7. Increased survival rates: Early diagnosis can lead to increased survival rates for certain diseases or conditions, particularly those that are more treatable when detected early.
8. Better management of chronic conditions: Screening tests and early diagnosis can help individuals with chronic conditions to manage their condition more effectively, which can improve their quality of life and increase their lifespan.
9. Improved patient satisfaction: Early diagnosis can lead to improved patient satisfaction by providing individuals with a sense of control over their health and well-being.
10. Reduced anxiety: By detecting diseases or conditions before they cause any noticeable symptoms, individuals may experience reduced anxiety about their health and well-being.

Overall, early diagnosis has the potential to significantly improve patient outcomes and quality of life for individuals with a wide range of medical conditions. It is important for healthcare providers to prioritize early diagnosis and screening tests in order to provide the best possible care for their patients.

There are three main types of bundle branch blocks:

1. Right bundle branch block (RBBB): This occurs when the electrical conduction bundle that carries the heart's rhythm from the right atrium to the right ventricle is damaged or diseased.
2. Left bundle branch block (LBBB): This occurs when the electrical conduction bundle that carries the heart's rhythm from the left atrium to the left ventricle is damaged or diseased.
3. Bifascicular bundle branch block: This occurs when two of the electrical conduction bundles are damaged or diseased.

Symptoms of bundle branch block may include:

* Heart palpitations
* Slow or irregular heartbeat
* Shortness of breath
* Fatigue
* Dizziness or lightheadedness
* Chest pain or discomfort

Diagnosis of bundle branch block is typically made using an electrocardiogram (ECG) test, which measures the electrical activity of the heart. Treatment options for BBB may include medications to regulate the heartbeat, cardiac resynchronization therapy (CRT) to help both ventricles beat together, or implantable cardioverter-defibrillator (ICD) to prevent life-threatening arrhythmias. In some cases, surgery may be necessary to repair or replace damaged heart tissue.

It is important to note that bundle branch block can increase the risk of developing other cardiac conditions such as heart failure, atrial fibrillation, and ventricular tachycardia. Therefore, it is essential for individuals with BBB to work closely with their healthcare provider to manage their condition and reduce the risk of complications.

There are several types of cardiomyopathies, each with distinct characteristics and symptoms. Some of the most common forms of cardiomyopathy include:

1. Hypertrophic cardiomyopathy (HCM): This is the most common form of cardiomyopathy and is characterized by an abnormal thickening of the heart muscle, particularly in the left ventricle. HCM can lead to obstruction of the left ventricular outflow tract and can increase the risk of sudden death.
2. Dilated cardiomyopathy: This type of cardiomyopathy is characterized by a decrease in the heart's ability to pump blood effectively, leading to enlargement of the heart and potentially life-threatening complications such as congestive heart failure.
3. Restrictive cardiomyopathy: This type of cardiomyopathy is characterized by stiffness of the heart muscle, which makes it difficult for the heart to fill with blood. This can lead to shortness of breath and fatigue.
4. Left ventricular non-compaction (LVNC): This is a rare type of cardiomyopathy that occurs when the left ventricle does not properly compact, leading to reduced cardiac function and potentially life-threatening complications.
5. Cardiac amyloidosis: This is a condition in which abnormal proteins accumulate in the heart tissue, leading to stiffness and impaired cardiac function.
6. Right ventricular cardiomyopathy (RVCM): This type of cardiomyopathy is characterized by impaired function of the right ventricle, which can lead to complications such as pulmonary hypertension and heart failure.
7. Endocardial fibroelastoma: This is a rare type of cardiomyopathy that occurs when abnormal tissue grows on the inner lining of the heart, leading to reduced cardiac function and potentially life-threatening complications.
8. Cardiac sarcoidosis: This is a condition in which inflammatory cells accumulate in the heart, leading to impaired cardiac function and potentially life-threatening complications.
9. Hypertrophic cardiomyopathy (HCM): This is a condition in which the heart muscle thickens, leading to reduced cardiac function and potentially life-threatening complications such as arrhythmias and sudden death.
10. Hypokinetic left ventricular cardiomyopathy: This type of cardiomyopathy is characterized by decreased contraction of the left ventricle, leading to reduced cardiac function and potentially life-threatening complications such as heart failure.

It's important to note that some of these types of cardiomyopathy are more common in certain populations, such as hypertrophic cardiomyopathy being more common in young athletes. Additionally, some types of cardiomyopathy may have overlapping symptoms or co-occurring conditions, so it's important to work with a healthcare provider for an accurate diagnosis and appropriate treatment.

In a normal heart, the aorta arises from the left ventricle and the pulmonary artery arises from the right ventricle. In TGV, the positions of these vessels are reversed, with the aorta arising from the right ventricle and the pulmonary artery arising from the left ventricle. This can lead to a variety of complications, including cyanosis (blue discoloration of the skin), tachycardia (rapid heart rate), and difficulty breathing.

TGV is often diagnosed during infancy or early childhood, and treatment typically involves surgery to repair the defect. In some cases, a procedure called an arterial switch may be performed, in which the aorta and pulmonary artery are surgically reversed to their normal positions. In other cases, a heart transplant may be necessary. With proper treatment, many individuals with TGV can lead active and healthy lives. However, they may require ongoing monitoring and care throughout their lives to manage any potential complications.

In medical terms, death is defined as the irreversible cessation of all bodily functions that are necessary for life. This includes the loss of consciousness, the absence of breathing, heartbeat, and other vital signs. Brain death, which occurs when the brain no longer functions, is considered a definitive sign of death.

The medical professionals use various criteria to determine death, such as:

1. Cessation of breathing: When an individual stops breathing for more than 20 minutes, it is considered a sign of death.
2. Cessation of heartbeat: The loss of heartbeat for more than 20 minutes is another indicator of death.
3. Loss of consciousness: If an individual is unresponsive and does not react to any stimuli, it can be assumed that they have died.
4. Brain death: When the brain no longer functions, it is considered a definitive sign of death.
5. Decay of body temperature: After death, the body's temperature begins to decrease, which is another indicator of death.

In some cases, medical professionals may use advanced technologies such as electroencephalography (EEG) or functional magnetic resonance imaging (fMRI) to confirm brain death. These tests can help determine whether the brain has indeed ceased functioning and if there is no hope of reviving the individual.

It's important to note that while death is a natural part of life, it can be a difficult and emotional experience for those who are left behind. It's essential to provide support and care to the family members and loved ones of the deceased during this challenging time.

1) They share similarities with humans: Many animal species share similar biological and physiological characteristics with humans, making them useful for studying human diseases. For example, mice and rats are often used to study diseases such as diabetes, heart disease, and cancer because they have similar metabolic and cardiovascular systems to humans.

2) They can be genetically manipulated: Animal disease models can be genetically engineered to develop specific diseases or to model human genetic disorders. This allows researchers to study the progression of the disease and test potential treatments in a controlled environment.

3) They can be used to test drugs and therapies: Before new drugs or therapies are tested in humans, they are often first tested in animal models of disease. This allows researchers to assess the safety and efficacy of the treatment before moving on to human clinical trials.

4) They can provide insights into disease mechanisms: Studying disease models in animals can provide valuable insights into the underlying mechanisms of a particular disease. This information can then be used to develop new treatments or improve existing ones.

5) Reduces the need for human testing: Using animal disease models reduces the need for human testing, which can be time-consuming, expensive, and ethically challenging. However, it is important to note that animal models are not perfect substitutes for human subjects, and results obtained from animal studies may not always translate to humans.

6) They can be used to study infectious diseases: Animal disease models can be used to study infectious diseases such as HIV, TB, and malaria. These models allow researchers to understand how the disease is transmitted, how it progresses, and how it responds to treatment.

7) They can be used to study complex diseases: Animal disease models can be used to study complex diseases such as cancer, diabetes, and heart disease. These models allow researchers to understand the underlying mechanisms of the disease and test potential treatments.

8) They are cost-effective: Animal disease models are often less expensive than human clinical trials, making them a cost-effective way to conduct research.

9) They can be used to study drug delivery: Animal disease models can be used to study drug delivery and pharmacokinetics, which is important for developing new drugs and drug delivery systems.

10) They can be used to study aging: Animal disease models can be used to study the aging process and age-related diseases such as Alzheimer's and Parkinson's. This allows researchers to understand how aging contributes to disease and develop potential treatments.

The exact cause of HCM is not fully understood, but it is thought to be related to a combination of genetic and environmental factors. Some people with HCM have a family history of the condition, and it is also more common in certain populations such as athletes and individuals with a history of hypertension or diabetes.

Symptoms of HCM can vary from person to person and may include shortness of breath, fatigue, palpitations, and chest pain. In some cases, HCM may not cause any symptoms at all and may be detected only through a physical examination or diagnostic tests such as an echocardiogram or electrocardiogram (ECG).

Treatment for HCM typically focuses on managing symptoms and reducing the risk of complications. This may include medications to reduce blood pressure, control arrhythmias, or improve heart function, as well as lifestyle modifications such as regular exercise and a healthy diet. In some cases, surgery or other procedures may be necessary to treat HCM.

Prognosis for individuals with HCM varies depending on the severity of the condition and the presence of any complications. With appropriate treatment and management, many people with HCM can lead active and fulfilling lives, but it is important to receive regular monitoring and care from a healthcare provider to manage the condition effectively.

There are several types of diabetic angiopathies, including:

1. Peripheral artery disease (PAD): This occurs when the blood vessels in the legs and arms become narrowed or blocked, leading to reduced blood flow and oxygen supply to the limbs.
2. Peripheral neuropathy: This is damage to the nerves in the hands and feet, which can cause pain, numbness, and weakness.
3. Retinopathy: This is damage to the blood vessels in the retina, which can lead to vision loss and blindness.
4. Nephropathy: This is damage to the kidneys, which can lead to kidney failure and the need for dialysis.
5. Cardiovascular disease: This includes heart attack, stroke, and other conditions that affect the heart and blood vessels.

The risk of developing diabetic angiopathies increases with the duration of diabetes and the level of blood sugar control. Other factors that can increase the risk include high blood pressure, high cholesterol, smoking, and a family history of diabetes-related complications.

Symptoms of diabetic angiopathies can vary depending on the specific type of complication and the location of the affected blood vessels or nerves. Common symptoms include:

* Pain or discomfort in the arms, legs, hands, or feet
* Numbness or tingling sensations in the hands and feet
* Weakness or fatigue in the limbs
* Difficulty healing wounds or cuts
* Vision changes or blindness
* Kidney problems or failure
* Heart attack or stroke

Diagnosis of diabetic angiopathies typically involves a combination of physical examination, medical history, and diagnostic tests such as ultrasound, MRI, or CT scans. Treatment options vary depending on the specific type of complication and may include:

* Medications to control blood sugar levels, high blood pressure, and high cholesterol
* Lifestyle changes such as a healthy diet and regular exercise
* Surgery to repair or bypass affected blood vessels or nerves
* Dialysis for kidney failure
* In some cases, amputation of the affected limb

Preventing diabetic angiopathies involves managing diabetes effectively through a combination of medication, lifestyle changes, and regular medical check-ups. Early detection and treatment can help prevent or delay the progression of complications.

There are several types of ischemia, including:

1. Myocardial ischemia: Reduced blood flow to the heart muscle, which can lead to chest pain or a heart attack.
2. Cerebral ischemia: Reduced blood flow to the brain, which can lead to stroke or cognitive impairment.
3. Peripheral arterial ischemia: Reduced blood flow to the legs and arms.
4. Renal ischemia: Reduced blood flow to the kidneys.
5. Hepatic ischemia: Reduced blood flow to the liver.

Ischemia can be diagnosed through a variety of tests, including electrocardiograms (ECGs), stress tests, and imaging studies such as CT or MRI scans. Treatment for ischemia depends on the underlying cause and may include medications, lifestyle changes, or surgical interventions.

There are two main types of heart failure:

1. Left-sided heart failure: This occurs when the left ventricle, which is the main pumping chamber of the heart, becomes weakened and is unable to pump blood effectively. This can lead to congestion in the lungs and other organs.
2. Right-sided heart failure: This occurs when the right ventricle, which pumps blood to the lungs, becomes weakened and is unable to pump blood effectively. This can lead to congestion in the body's tissues and organs.

Symptoms of heart failure may include:

* Shortness of breath
* Fatigue
* Swelling in the legs, ankles, and feet
* Swelling in the abdomen
* Weight gain
* Coughing up pink, frothy fluid
* Rapid or irregular heartbeat
* Dizziness or lightheadedness

Treatment for heart failure typically involves a combination of medications and lifestyle changes. Medications may include diuretics to remove excess fluid from the body, ACE inhibitors or beta blockers to reduce blood pressure and improve blood flow, and aldosterone antagonists to reduce the amount of fluid in the body. Lifestyle changes may include a healthy diet, regular exercise, and stress reduction techniques. In severe cases, heart failure may require hospitalization or implantation of a device such as an implantable cardioverter-defibrillator (ICD) or a left ventricular assist device (LVAD).

It is important to note that heart failure is a chronic condition, and it requires ongoing management and monitoring to prevent complications and improve quality of life. With proper treatment and lifestyle changes, many people with heart failure are able to manage their symptoms and lead active lives.

There are several possible causes of dilated cardiomyopathy, including:

1. Coronary artery disease: This is the most common cause of dilated cardiomyopathy, and it occurs when the coronary arteries become narrowed or blocked, leading to a decrease in blood flow to the heart muscle.
2. High blood pressure: Prolonged high blood pressure can cause the heart muscle to become weakened and enlarged.
3. Heart valve disease: Dysfunctional heart valves can lead to an increased workload on the heart, which can cause dilated cardiomyopathy.
4. Congenital heart defects: Some congenital heart defects can lead to an enlarged heart and dilated cardiomyopathy.
5. Alcohol abuse: Chronic alcohol abuse can damage the heart muscle and lead to dilated cardiomyopathy.
6. Viral infections: Some viral infections, such as myocarditis, can cause inflammation of the heart muscle and lead to dilated cardiomyopathy.
7. Genetic disorders: Certain genetic disorders, such as hypertrophic cardiomyopathy, can cause dilated cardiomyopathy.
8. Obesity: Obesity is a risk factor for developing dilated cardiomyopathy, particularly in younger people.
9. Diabetes: Diabetes can increase the risk of developing dilated cardiomyopathy, especially if left untreated or poorly controlled.
10. Age: Dilated cardiomyopathy is more common in older adults, with the majority of cases occurring in people over the age of 65.

It's important to note that many people with these risk factors will not develop dilated cardiomyopathy, and some people without any known risk factors can still develop the condition. If you suspect you or someone you know may have dilated cardiomyopathy, it's important to consult a healthcare professional for proper diagnosis and treatment.

1. Heart Disease: High blood sugar levels can damage the blood vessels and increase the risk of heart disease, which includes conditions like heart attacks, strokes, and peripheral artery disease.
2. Kidney Damage: Uncontrolled diabetes can damage the kidneys over time, leading to chronic kidney disease and potentially even kidney failure.
3. Nerve Damage: High blood sugar levels can damage the nerves in the body, causing numbness, tingling, and pain in the hands and feet. This is known as diabetic neuropathy.
4. Eye Problems: Diabetes can cause changes in the blood vessels of the eyes, leading to vision problems and even blindness. This is known as diabetic retinopathy.
5. Infections: People with diabetes are more prone to developing skin infections, urinary tract infections, and other types of infections due to their weakened immune system.
6. Amputations: Poor blood flow and nerve damage can lead to amputations of the feet or legs if left untreated.
7. Cognitive Decline: Diabetes has been linked to an increased risk of cognitive decline and dementia.
8. Sexual Dysfunction: Men with diabetes may experience erectile dysfunction, while women with diabetes may experience decreased sexual desire and vaginal dryness.
9. Gum Disease: People with diabetes are more prone to developing gum disease and other oral health problems due to their increased risk of infection.
10. Flu and Pneumonia: Diabetes can weaken the immune system, making it easier to catch the flu and pneumonia.

It is important for people with diabetes to manage their condition properly to prevent or delay these complications from occurring. This includes monitoring blood sugar levels regularly, taking medication as prescribed by a doctor, and following a healthy diet and exercise plan. Regular check-ups with a healthcare provider can also help identify any potential complications early on and prevent them from becoming more serious.

There are several types of ventricular dysfunction, including:

1. Left ventricular dysfunction: This occurs when the left ventricle, which is the main pumping chamber of the heart, becomes weakened or impaired. This can lead to reduced cardiac output and can increase the risk of heart failure.
2. Right ventricular dysfunction: This occurs when the right ventricle, which pumps blood into the lungs, becomes weakened or impaired. This can lead to pulmonary hypertension and other complications.
3. Biventricular dysfunction: This occurs when both the left and right ventricles become weakened or impaired. This can lead to severe cardiac impairment and increased risk of heart failure.

Ventricular dysfunction can be diagnosed through a variety of tests, including echocardiography, stress testing, and cardiac magnetic resonance imaging (MRI). Treatment options depend on the underlying cause of the dysfunction and may include medications, lifestyle changes, or surgical interventions. In some cases, implantable devices such as pacemakers or defibrillators may be recommended to help regulate the heart rhythm and improve function.

There are many different causes of pathological dilatation, including:

1. Infection: Infections like tuberculosis or abscesses can cause inflammation and swelling in affected tissues, leading to dilatation.
2. Inflammation: Inflammatory conditions like rheumatoid arthritis or Crohn's disease can cause dilatation of blood vessels and organs.
3. Heart disease: Conditions like heart failure or coronary artery disease can lead to dilatation of the heart chambers or vessels.
4. Liver or spleen disease: Dilatation of the liver or spleen can occur due to conditions like cirrhosis or splenomegaly.
5. Neoplasms: Tumors can cause dilatation of affected structures, such as blood vessels or organs.

Pathological dilatation can lead to a range of symptoms depending on the location and severity of the condition. These may include:

1. Swelling or distension of the affected structure
2. Pain or discomfort in the affected area
3. Difficulty breathing or swallowing (in the case of dilatation in the throat or airways)
4. Fatigue or weakness
5. Pale or clammy skin
6. Rapid heart rate or palpitations
7. Shortness of breath (dyspnea)

Diagnosis of pathological dilatation typically involves a combination of physical examination, imaging studies like X-rays or CT scans, and laboratory tests to identify the underlying cause. Treatment depends on the specific condition and may include medications, surgery, or other interventions to address the underlying cause and relieve symptoms.

Some examples of pathologic constrictions include:

1. Stenosis: A narrowing or constriction of a blood vessel or other tubular structure, often caused by the buildup of plaque or scar tissue.
2. Asthma: A condition characterized by inflammation and constriction of the airways, which can make breathing difficult.
3. Esophageal stricture: A narrowing of the esophagus that can cause difficulty swallowing.
4. Gastric ring constriction: A narrowing of the stomach caused by a band of tissue that forms in the upper part of the stomach.
5. Anal fissure: A tear in the lining of the anus that can cause pain and difficulty passing stools.

Pathologic constrictions can be caused by a variety of factors, including inflammation, infection, injury, or genetic disorders. They can be diagnosed through imaging tests such as X-rays, CT scans, or endoscopies, and may require surgical treatment to relieve symptoms and improve function.

Examples of acute diseases include:

1. Common cold and flu
2. Pneumonia and bronchitis
3. Appendicitis and other abdominal emergencies
4. Heart attacks and strokes
5. Asthma attacks and allergic reactions
6. Skin infections and cellulitis
7. Urinary tract infections
8. Sinusitis and meningitis
9. Gastroenteritis and food poisoning
10. Sprains, strains, and fractures.

Acute diseases can be treated effectively with antibiotics, medications, or other therapies. However, if left untreated, they can lead to chronic conditions or complications that may require long-term care. Therefore, it is important to seek medical attention promptly if symptoms persist or worsen over time.

Cicatrix is a term used to describe the scar tissue that forms after an injury or surgery. It is made up of collagen fibers and other cells, and its formation is a natural part of the healing process. The cicatrix can be either hypertrophic (raised) or atrophic (depressed), depending on the severity of the original wound.

The cicatrix serves several important functions in the healing process, including:

1. Protection: The cicatrix helps to protect the underlying tissue from further injury and provides a barrier against infection.
2. Strength: The collagen fibers in the cicatrix give the scar tissue strength and flexibility, allowing it to withstand stress and strain.
3. Support: The cicatrix provides support to the surrounding tissue, helping to maintain the shape of the affected area.
4. Cosmetic appearance: The appearance of the cicatrix can affect the cosmetic outcome of a wound or surgical incision. Hypertrophic scars are typically red and raised, while atrophic scars are depressed and may be less noticeable.

While the formation of cicatrix is a normal part of the healing process, there are some conditions that can affect its development or appearance. For example, keloid scars are raised, thick scars that can form as a result of an overactive immune response to injury. Acne scars can also be difficult to treat and may leave a lasting impression on the skin.

In conclusion, cicatrix is an important part of the healing process after an injury or surgery. It provides protection, strength, support, and can affect the cosmetic appearance of the affected area. Understanding the formation and functions of cicatrix can help medical professionals to better manage wound healing and improve patient outcomes.

There are several different types of calcinosis, each with its own unique causes and symptoms. Some common forms of calcinosis include:

1. Dystrophic calcinosis: This type of calcinosis occurs in people with muscular dystrophy, a group of genetic disorders that affect muscle strength and function. Dystrophic calcinosis can cause calcium deposits to form in the muscles, leading to muscle weakness and wasting.
2. Metastatic calcinosis: This type of calcinosis occurs when cancer cells spread to other parts of the body and cause calcium deposits to form. Metastatic calcinosis can occur in people with a variety of different types of cancer, including breast, lung, and prostate cancer.
3. Idiopathic calcinosis: This type of calcinosis occurs for no apparent reason, and the exact cause is not known. Idiopathic calcinosis can affect people of all ages and can cause calcium deposits to form in a variety of different tissues.
4. Secondary calcinosis: This type of calcidosis occurs as a result of an underlying medical condition or injury. For example, secondary calcinosis can occur in people with kidney disease, hyperparathyroidism (a condition in which the parathyroid glands produce too much parathyroid hormone), or traumatic injuries.

Treatment for calcinosis depends on the underlying cause and the severity of the condition. In some cases, treatment may involve managing the underlying disease or condition that is causing the calcium deposits to form. Other treatments may include medications to reduce inflammation and pain, physical therapy to improve mobility and strength, and surgery to remove the calcium deposits.

1. Accessory coronary arteries: These are extra coronary arteries that arise from the aortic sinus or the pulmonary trunk and supply blood to the heart muscle.
2. Coronary artery fistula: This is an abnormal connection between two coronary arteries or between a coronary artery and another cardiac structure, such as the left atrium or ventricle.
3. Coronary artery malformations: These are abnormalities in the origin, course, or termination of the coronary arteries.
4. Coronary atherosclerosis: This is the buildup of plaque in the coronary arteries, which can lead to reduced blood flow to the heart muscle and increase the risk of heart attack.
5. Coronary vasospasm: This is a temporary narrowing of the coronary arteries, often triggered by stress or certain medications.

Coronary vessel anomalies can be diagnosed using various imaging tests such as angiography, CT scans, and MRI. Treatment options for these anomalies depend on the severity of the condition and may include medications, lifestyle changes, or surgical interventions. It is important to identify and address coronary vessel anomalies to prevent or manage cardiac conditions such as heart attack, heart failure, and arrhythmias.

MRI can occur in various cardiovascular conditions, such as myocardial infarction (heart attack), cardiac arrest, and cardiac surgery. The severity of MRI can range from mild to severe, depending on the extent and duration of the ischemic event.

The pathophysiology of MRI involves a complex interplay of various cellular and molecular mechanisms. During ischemia, the heart muscle cells undergo changes in energy metabolism, electrolyte balance, and cell membrane function. When blood flow is restored, these changes can lead to an influx of calcium ions into the cells, activation of enzymes, and production of reactive oxygen species (ROS), which can damage the cells and their membranes.

The clinical presentation of MRI can vary depending on the severity of the injury. Some patients may experience chest pain, shortness of breath, and fatigue. Others may have more severe symptoms, such as cardiogenic shock or ventricular arrhythmias. The diagnosis of MRI is based on a combination of clinical findings, electrocardiography (ECG), echocardiography, and cardiac biomarkers.

The treatment of MRI is focused on addressing the underlying cause of the injury and managing its symptoms. For example, in patients with myocardial infarction, thrombolysis or percutaneous coronary intervention may be used to restore blood flow to the affected area. In patients with cardiac arrest, cardiopulmonary resuscitation (CPR) and other life-saving interventions may be necessary.

Prevention of MRI is crucial in reducing its incidence and severity. This involves aggressive risk factor management, such as controlling hypertension, diabetes, and dyslipidemia, as well as smoking cessation and stress reduction. Additionally, patients with a history of MI should adhere to their medication regimen, which may include beta blockers, ACE inhibitors or ARBs, statins, and aspirin.

In conclusion, myocardial injury with ST-segment elevation (MRI) is a life-threatening condition that requires prompt recognition and treatment. While the clinical presentation can vary depending on the severity of the injury, early diagnosis and management are crucial in reducing morbidity and mortality. Prevention through aggressive risk factor management and adherence to medication regimens is also essential in preventing MRI.

Some examples of the use of 'Death, Sudden, Cardiac' in medical contexts include:

1. Sudden cardiac death (SCD) is a major public health concern, affecting thousands of people each year in the United States alone. It is often caused by inherited heart conditions, such as hypertrophic cardiomyopathy or long QT syndrome.
2. The risk of sudden cardiac death is higher for individuals with a family history of heart disease or other pre-existing cardiovascular conditions.
3. Sudden cardiac death can be prevented by prompt recognition and treatment of underlying heart conditions, as well as by avoiding certain risk factors such as smoking, physical inactivity, and an unhealthy diet.
4. Cardiopulmonary resuscitation (CPR) and automated external defibrillators (AEDs) can be effective in restoring a normal heart rhythm during sudden cardiac death, especially when used promptly after the onset of symptoms.

There are several types of embolism, including:

1. Pulmonary embolism: A blood clot that forms in the lungs and blocks the flow of blood to the heart.
2. Cerebral embolism: A blood clot or other foreign substance that blocks the flow of blood to the brain.
3. Coronary embolism: A blood clot that blocks the flow of blood to the heart muscle, causing a heart attack.
4. Intestinal embolism: A blood clot or other foreign substance that blocks the flow of blood to the intestines.
5. Fat embolism: A condition where fat enters the bloodstream and becomes lodged in a blood vessel, blocking the flow of blood.

The symptoms of embolism can vary depending on the location of the blockage, but may include:

* Pain or tenderness in the affected area
* Swelling or redness in the affected limb
* Difficulty breathing or shortness of breath
* Chest pain or pressure
* Lightheadedness or fainting
* Rapid heart rate or palpitations

Treatment for embolism depends on the underlying cause and the severity of the blockage. In some cases, medication may be used to dissolve blood clots or break up the blockage. In other cases, surgery may be necessary to remove the foreign substance or repair the affected blood vessel.

Prevention is key in avoiding embolism, and this can include:

* Managing underlying conditions such as high blood pressure, diabetes, or heart disease
* Avoiding long periods of immobility, such as during long-distance travel
* Taking blood-thinning medication to prevent blood clots from forming
* Maintaining a healthy weight and diet to reduce the risk of fat embolism.

The underlying cause of ACS is typically a blockage in one of the coronary arteries, which supply blood to the heart muscle. This blockage can be caused by atherosclerosis, a condition in which plaque builds up in the arteries and narrows them, or by a blood clot that forms in the artery and blocks the flow of blood.

The diagnosis of ACS is typically made based on a combination of symptoms, physical examination findings, and results of diagnostic tests such as electrocardiograms (ECGs) and blood tests. Treatment for ACS usually involves medications to dissolve blood clots and reduce the amount of work the heart has to do, as well as procedures such as angioplasty or coronary artery bypass surgery to restore blood flow to the heart.

Preventive measures for ACS include managing risk factors such as high blood pressure, high cholesterol, smoking, and diabetes, as well as increasing physical activity and eating a healthy diet. Early diagnosis and treatment of ACS can help reduce the risk of complications and improve outcomes for patients.

There are several types of hypercholesterolemia, including:

1. Familial hypercholesterolemia: This is an inherited condition that causes high levels of low-density lipoprotein (LDL) cholesterol, also known as "bad" cholesterol, in the blood.
2. Non-familial hypercholesterolemia: This type of hypercholesterolemia is not inherited and can be caused by a variety of factors, such as a high-fat diet, lack of exercise, obesity, and certain medical conditions, such as hypothyroidism or polycystic ovary syndrome (PCOS).
3. Mixed hypercholesterolemia: This type of hypercholesterolemia is characterized by high levels of both LDL and high-density lipoprotein (HDL) cholesterol in the blood.

The diagnosis of hypercholesterolemia is typically made based on a physical examination, medical history, and laboratory tests, such as a lipid profile, which measures the levels of different types of cholesterol and triglycerides in the blood. Treatment for hypercholesterolemia usually involves lifestyle changes, such as a healthy diet and regular exercise, and may also include medication, such as statins, to lower cholesterol levels.

LVH can lead to a number of complications, including:

1. Heart failure: The enlarged left ventricle can become less efficient at pumping blood throughout the body, leading to heart failure.
2. Arrhythmias: The abnormal electrical activity in the heart can lead to irregular heart rhythms.
3. Sudden cardiac death: In some cases, LVH can increase the risk of sudden cardiac death.
4. Atrial fibrillation: The enlarged left atrium can lead to atrial fibrillation, a common type of arrhythmia.
5. Mitral regurgitation: The enlargement of the left ventricle can cause the mitral valve to become incompetent, leading to mitral regurgitation.
6. Heart valve problems: The enlarged left ventricle can lead to heart valve problems, such as mitral regurgitation or aortic stenosis.
7. Coronary artery disease: LVH can increase the risk of coronary artery disease, which can lead to a heart attack.
8. Pulmonary hypertension: The enlarged left ventricle can lead to pulmonary hypertension, which can further strain the heart and increase the risk of complications.

Evaluation of LVH typically involves a physical examination, medical history, electrocardiogram (ECG), echocardiography, and other diagnostic tests such as stress test or cardiac MRI. Treatment options for LVH depend on the underlying cause and may include medications, lifestyle changes, and in some cases, surgery or other interventions.

During ventricular remodeling, the heart muscle becomes thicker and less flexible, leading to a decrease in the heart's ability to fill with blood and pump it out to the body. This can lead to shortness of breath, fatigue, and swelling in the legs and feet.

Ventricular remodeling is a natural response to injury, but it can also be exacerbated by factors such as high blood pressure, diabetes, and obesity. Treatment for ventricular remodeling typically involves medications and lifestyle changes, such as exercise and a healthy diet, to help manage symptoms and slow the progression of the condition. In some cases, surgery or other procedures may be necessary to repair or replace damaged heart tissue.

The process of ventricular remodeling is complex and involves multiple cellular and molecular mechanisms. It is thought to be driven by a variety of factors, including changes in gene expression, inflammation, and the activity of various signaling pathways.

Overall, ventricular remodeling is an important condition that can have significant consequences for patients with heart disease. Understanding its causes and mechanisms is crucial for developing effective treatments and improving outcomes for those affected by this condition.

There are two main types of systemic scleroderma: diffuse cutaneous systemic sclerosis (DCSS) and limited cutaneous systemic sclerosis (LCSS). DCSS is characterized by skin thickening and scar formation over the trunk, arms, and legs, while LCSS is characterized by skin tightening and patches of scaly skin on the hands and face.

The symptoms of systemic scleroderma can include:

* Skin hardening and tightening
* Fatigue
* Joint pain and stiffness
* Muscle weakness
* Swallowing difficulties
* Heartburn and acid reflux
* Shortness of breath
* Raynaud's phenomenon (pale or blue-colored fingers and toes in response to cold temperatures or stress)

The exact cause of systemic scleroderma is not known, but it is believed to involve a combination of genetic and environmental factors. Treatment options for systemic scleroderma include medications to manage symptoms such as pain, stiffness, and swallowing difficulties, as well as physical therapy and lifestyle modifications to improve quality of life.

In summary, systemic scleroderma is a chronic autoimmune disease that affects multiple systems in the body, causing skin hardening and thickening, fatigue, joint pain, and other symptoms. While there is no cure for systemic scleroderma, treatment options are available to manage symptoms and improve quality of life.

Synonyms: RV dysfunction

See also: Left Ventricular Dysfunction, Cardiac Dysfunction, Heart Failure

Note: This term is not a formal medical diagnosis but rather a descriptive term used to indicate the specific location of cardiac dysfunction. A more comprehensive diagnosis would require further evaluation and testing by a healthcare provider.

Coronary Thrombosis can cause a range of symptoms including chest pain, shortness of breath, lightheadedness and fatigue. The severity of the symptoms depends on the location and size of the clot. In some cases, the condition may be asymptomatic and diagnosed incidentally during a medical examination or imaging test.

Diagnosis of Coronary Thrombosis is typically made using electrocardiogram (ECG), blood tests and imaging studies such as angiography or echocardiography. Treatment options include medications to dissolve the clot, surgery to open or bypass the blocked artery or other interventional procedures such as angioplasty or stenting.

Prevention of Coronary Thrombosis includes managing risk factors such as high blood pressure, high cholesterol levels, smoking and diabetes through lifestyle changes and medications. Early detection and treatment can help reduce the risk of complications and improve outcomes for patients with this condition.

From 1993 to 2001, myocardial perfusion scans in the US increased >6%/y with "no justification". Myocardial perfusion imaging ... "Resurrection of Thallium-201 for Myocardial Perfusion Imaging". JACC: Cardiovascular Imaging. 2 (3): 283-285. doi:10.1016/j. ... Myocardial perfusion imaging or scanning (also referred to as MPI or MPS) is a nuclear medicine procedure that illustrates the ... Myocardial+Perfusion+Imaging at the US National Library of Medicine Medical Subject Headings (MeSH) Lee, J. C.; West, M. J.; ...
"Myocardial perfusion scintigraphy: the evidence". European Journal of Nuclear Medicine and Molecular Imaging. 31 (2): 261-291. ... This imaging technique has a sensitivity of around 90%. Resting images are useful only for detecting tissue damage, while ... The drug is injected at peak stress and then imaging is performed. The resulting two sets of images are compared with each ... Two sets of images are acquired. For one set, 99mTc MIBI is injected while the patient is at rest and then the myocardium is ...
"Myocardial perfusion scintigraphy: the evidence". European Journal of Nuclear Medicine and Molecular Imaging. 31 (2): 261-291. ... Some isocyanide complexes are used in medical imaging. Several thousand isocyanides are known, but the coordination chemistry ...
82Rb is widely used in myocardial perfusion imaging. This isotope undergoes rapid uptake by myocardiocytes, which makes it a ... "Story of rubidium-82 and advantages for myocardial perfusion PET imaging". Frontiers in Medicine. 2: 65. doi:10.3389/fmed. ... "Diagnostic Accuracy of Rubidium-82 Myocardial Perfusion Imaging With Hybrid Positron Emission Tomography/Computed Tomography in ... "Generator-produced rubidium-82 positron emission tomography myocardial perfusion imaging-From basic aspects to clinical ...
... images shows the heart as it contracts over the interval from one R wave to the next. Gated myocardial perfusion imaging has ... Gated SPECT is a nuclear medicine imaging technique, typically for the heart in myocardial perfusion imagery. An ... Kuikka, Jyrki T (2007). "Myocardial Perfusion Imaging with Combined Single-photon Emission Computed Tomography and Multislice ... DePasquale, Eugene (25 February 2003). "Role of Myocardial Perfusion Imaging in Managing CAD". Medscape. Retrieved 28 September ...
... such as functional cardiac or brain imaging. Myocardial perfusion imaging (MPI) is a form of functional cardiac imaging, used ... Elhendy et al., "Dobutamine Stress Myocardial Perfusion Imaging in Coronary Artery Disease", J Nucl Med 2002 43: 1634-1646. ... Elhendy, A; Bax, JJ; Poldermans, D (2002). "Dobutamine stress myocardial perfusion imaging in coronary artery disease". Journal ... gated myocardial SPECT can be used to obtain quantitative information about myocardial perfusion, thickness, and contractility ...
... water for PET myocardial perfusion imaging and for brain imaging. It has an atomic mass of 15.0030656(5), and a half-life of ... "Current and Future Status of PET Myocardial Perfusion Tracers". Current Cardiovascular Imaging Reports. 8 (1): 333-343. doi: ...
Chemistry portal Myocardial perfusion imaging "Standard Atomic Weights: Thallium". CIAAW. 2009. Dong, Z.-C.; Corbett, J. D. ( ... and Risk Stratification of Coronary Artery Disease by Thallium-201 Myocardial Perfusion Scintigraphy 155". Cardiac SPECT ... Jain, Diwakar; Zaret, Barry L. (2005). "Nuclear imaging in cardiovascular medicine". In Clive Rosendorff (ed.). Essential ... it has good imaging characteristics without an excessive patient-radiation dose. It is the most popular isotope used for ...
Williams, M.C.; Newby, D.E. (2016-08-01). "CT myocardial perfusion imaging: current status and future directions". Clinical ... This may also be used on the brain, where CT perfusion imaging can often detect poor brain perfusion well before it is detected ... CT perfusion imaging is a specific form of CT to assess flow through blood vessels whilst injecting a contrast agent. Blood ... These cross-sectional images are made up of small units of pixels or voxels. Pixels in an image obtained by CT scanning are ...
One of the main uses is myocardial perfusion imaging. As a result of changes in the blood-brain barrier in brain tumors, ... allowing the use of radioisotope rubidium-82 in nuclear medicine to locate and image brain tumors. Rubidium-82 has a very short ...
Uses of NM perfusion scanning include Ventilation/perfusion scans of lungs, myocardial perfusion imaging of the heart, and ... Myocardial perfusion imaging (MPI) is a form of functional cardiac imaging, used for the diagnosis of ischemic heart disease. ... Elhendy A, Bax J, Poldermans D (2002). "Dobutamine Stress Myocardial Perfusion Imaging in Coronary Artery Disease*". J Nucl Med ... with a Tl-201 myocardial perfusion study with dipyridamole, rest images can be acquired as little as two-hours post stress). ...
doi:10.1016/S0735-1097(02)80780-X. Anand, D. V; Lahiri, A (2003). "Myocardial perfusion imaging versus biochemical markers in ... Sabharwal, N K (2003). "Role of myocardial perfusion imaging for risk stratification in suspected or known coronary artery ... He also developed TC-99m tetrofosmin (Myoview) for myocardial perfusion imaging in man in conjunction with Amersham ... Contributed in early diagnostic imaging in asymptomatic diabetes. Referenced in the guidelines of imaging in diabetes- American ...
Myocardial perfusion imaging can be abnormal in 30% of patients. Coronary angiogram: Normal Other causes of chest pain must be ... Angiograms may be useful and conclusive when microvascular angina they offer a detailed image of the heart. However, they ... shown to improve angina and myocardial ischemia Statins Aspirin Clopidogrel ACE inhibitors and ARBs Lifestyle changes such as ...
The best known example of a nuclear stress test is myocardial perfusion imaging. Typically, a radiotracer (Tc-99 sestamibi, ... "The role of radionuclide myocardial perfusion imaging for asymptomatic individuals". Journal of Nuclear Cardiology. 18 (1): 3- ... echocardiogram images are obtained. The two echocardiogram images are then compared to assess for any abnormalities in wall ... The images obtained are similar to the ones obtained during a full surface echocardiogram, commonly referred to as ...
"Magnetic resonance first-pass myocardial perfusion imaging: clinical validation and future applications". J Magn Reson Imaging ... Cardiac magnetic resonance imaging perfusion (cardiac MRI perfusion, CMRI perfusion), also known as stress CMR perfusion, is a ... CMR perfusion is increasingly used in cardiac imaging to test for inducible myocardial ischaemia and has been well validated ... This is called a perfusion defect and usually represents myocardial ischaemia. It may be seen on both the rest and stress scans ...
February 1993). "Technetium-99m-tetrofosmin as a new radiopharmaceutical for myocardial perfusion imaging". Journal of Nuclear ... December 2005). "Risk stratification of patients with angina pectoris by stress 99mTc-tetrofosmin myocardial perfusion imaging ... Imaging normally begins 15 minutes following injection. Kelly JD, Forster AM, Higley B, Archer CM, Booker FS, Canning LR, et al ... Patients should be encouraged to void their bladders as soon as the images are gathered, and as often as possible after the ...
Contrast medium is given intravenously to assess myocardial perfusion and LGE. Phase contrast imaging may be used to quantify ... Pages using multiple image with auto scaled images, Webarchive template wayback links, Cardiac imaging, Magnetic resonance ... T2-weighted imaging is mainly used to detect myocardial edema which may develop in acute myocarditis or infarction. Phase- ... A positive result is evident from an inducible myocardial perfusion defect. Cost and availability mean that its use is often ...
... is used to tag ammonia molecules for PET myocardial perfusion imaging. Nitrogen-13 is used in medical PET imaging ... some of which facilitate co-generation of other light radionuclides for diagnostic imaging. Nitrogen-13 plays a significant ...
It is marketed under the brand name Cardiogen-82 by Bracco Diagnostics for use in Myocardial perfusion imaging. It is rapidly ... "Manufacture of strontium-82/rubidium-82 generators and quality control of rubidium-82 chloride for myocardial perfusion imaging ... "Noninvasive assessment of coronary stenoses by myocardial perfusion imaging during pharmacologic coronary vasodilation. VIII. ... can be used to identify regions of heart muscle that are receiving poor blood flow in a technique called PET perfusion imaging ...
Both adenosine and dipyridamole, which act on the A2A receptor, are used in myocardial perfusion imaging. Purinergic signalling ... Palani G, Ananthasubramaniam K (2013). "Regadenoson: review of its established role in myocardial perfusion imaging and ...
Cardiac PET and Cardiac SPECT including myocardial perfusion imaging. A physician may recommend cardiac imaging to support a ... SPECT is most commonly used for myocardial perfusion imaging to detect ischemic heart disease. Coronary catheterization uses ... Cardiac imaging refers to non-invasive imaging of the heart using ultrasound, magnetic resonance imaging (MRI), computed ... PET enables visual image analysis of multiple different metabolic chemical processes and is thus one of the most flexible ...
Stress testing with myocardial perfusion imaging[citation needed] It is sometimes treated by surgery. Subclavian steal syndrome ... or right ventricle may cause steal syndrome under conditions like myocardial infarction and possible angina or ventricular ...
"Significance of ST depression during exercise treadmill stress and adenosine infusion myocardial perfusion imaging". The ... ischemia Non Q-wave myocardial infarction Reciprocal changes in acute Q-wave myocardial infarction (e.g., ST depression in ... It is often a sign of myocardial ischemia, of which coronary insufficiency is a major cause. Other ischemic heart diseases ... leads I & aVL with acute inferior myocardial infarction) ST segment depression and T-wave changes may be seen in patients with ...
2012)." Evaluation of Discrete Angles Rotation Degradation for Myocardial Perfusion Imaging", EANM Annual Congress 2012. C. Liu ... F. Autrusseau and J. Guédon, "A joint multiple description-encryption image algorithm," in International Conference on Image ... application to medical imaging of trabecular bone," in SPIE Medical Imaging, 2010, vol. 7623, p. 762317. C. Zhang, J. Dong, J. ... in Medical Imaging 2008: Physics of Medical Imaging, 2008, vol. 6913, p. 69133F. M. Babel, B. Parrein, O. Déforges, N. Normand ...
"Comparison of exercise radionuclide angiocardiography and thallium-201 myocardial perfusion imaging in coronary artery disease ... He and other colleagues at Emory collaborated on the development of new quantitative techniques for cardiac SPECT imaging. ... imaging, supported by General Electric Medical Systems. ...
... and Risk Stratification of Coronary Artery Disease by Thallium-201 Myocardial Perfusion Scintigraphy 155". Cardiac SPECT ... It is a radiopharmaceutical, as it has good imaging characteristics without excessive patient radiation dose. It is the most ... imaging (2nd ed.). Lippincott Williams & Wilkins. pp. 155-178. ISBN 978-0-7817-2007-6. Archived from the original on 2017-02-22 ...
It produces hyperemia quickly and maintains it for a duration that is useful for radionuclide myocardial perfusion imaging. The ...
A potential PET myocardial perfusion imaging agent". Nuclear Medicine and Biology. 42 (10): 804-808. doi:10.1016/j.nucmedbio. ... F-FDG for PET imaging of folate receptor-positive tumors". Nuclear Medicine and Biology. 39 (6): 864-70. doi:10.1016/j. ... Reductive amination of hydrophilic 18F-fluoro-2-deoxyglucose with lipophilic amines for development of potential PET imaging ...
October 2006). "Relationship between myocardial perfusion and dysfunction in diabetic cardiomyopathy: a study of quantitative ... and nuclear imaging. Potential risks of the investigation (e.g. exposure to radiation) and diagnostic utility should be weighed ... impaired myocardial contractility and myocardial fibrosis. Additionally, it may lead to microvascular dysfunction, either ... A major source of increased myocardial stiffness is crosslinking between AGEs and collagen. In fact, a hallmark of uncontrolled ...
Additionally echocardiography, myocardial perfusion imaging, and cardiac stress testing is not recommended in those at low risk ... Chou R (March 2015). "Cardiac screening with electrocardiography, stress echocardiography, or myocardial perfusion imaging: ... Mental stress-induced myocardial ischemia is associated with an increased risk of heart problems in those with previous heart ... CVD includes coronary artery diseases (CAD) such as angina and myocardial infarction (commonly known as a heart attack). Other ...
30 mg/dL (increased) Creatinine > 1.5 mg/dL (increased) Cranial imaging is not used for diagnosis of this condition. However, ... Treatment of HHS begins with reestablishing tissue perfusion using intravenous fluids. People with HHS can be dehydrated by 8 ... myocardial infarction, stroke or another acute illness. A relative insulin deficiency leads to a serum glucose that is usually ... myocardial infarction, sepsis) Certain medications (glucocorticoids, beta-blockers, thiazide diuretics, calcium channel ...
"Imaging assessment of cardioprotection mediated by a dodecafluoropentane oxygen-carrier administered during myocardial ... or a better indication of the level of blood perfusion or blood volume in an area of interest. The bubbles persist in the blood ... Lantheus Medical Imaging. "DEFINITY® (Perflutren Lipid Microsphere) Injectable Suspension, Revised 2011" (PDF). U.S. Food and ... ISBN 978-0-12-759760-7. Cheng, Kenneth T. (2004). "Perflexane-Lipid Microspheres". Molecular Imaging and Contrast Agent ...
In the last decade, similar to myocardial infarction treatment, thrombolytic drugs were introduced in the therapy of cerebral ... "Syndrome" may be replaced by "hemorrhage" if imaging demonstrates a bleed. See Internet Stroke Center. "Oxford Stroke Scale". ... can be used to encourage perfusion to the penumbra. Robbins and Cotran pathologic basis of disease. Vinay Kumar, Abul K. Abbas ... Later publications distinguish between "syndrome" and "infarct", based on evidence from imaging. " ...
Ultrasound image of the inferior vena cava (IVC) in a person with cardiac tamponade. Note that the IVC is large and changes ... The effusion can occur rapidly (as in the case of trauma or myocardial rupture), or over a more gradual period of time (as in ... "severe deterioration of end-organ perfusion." Some of the symptoms, as a consequence, include abdominal pain due to liver ... Apical ultrasound image of the heart in a person with cardiac tamponade. Note how the right atrial collapses during systole. ...
Wait times for scheduled diagnostic services range from 4 weeks for bone density tests to 20 weeks for a myocardial perfusion ... The clinical scanner enables the Centre to do echo-planar imaging, producing images at video rates; the interventional MRI ... "Diagnostic Imaging Program". WRHA. 2008. Retrieved 25 September 2009. "Department of Diagnostic Imaging". St. Boniface Hospital ... Research carried out at the centre has been published in the Journal of Magnetic Resonance Imaging. The I. H. Asper Clinical ...
For example, a myocardial infarction that occurs immediately after the repair is normally related to the procedure and not the ... CT angiography (CTA) imaging has, in particular, made a key contribution to planning, success, durability in this complex area ... With increased drainage of spinal fluid, the intrathecal pressure decreases which allows for increase blood perfusion to the ... Diagnostic angiography images are captured of the aorta to determine the location of the patient's renal arteries, so the stent ...
The use of image guidance helps to confirm appropriate needle placement. This includes common imaging modalities used in joint ... As the perfusion to a limb diminishes further pain in the foot can occur even at rest and in fact the tissues of the foot can ... Coronary ischemia results in myocardial infarction, also known as a heart attack. The coronary arteries were one of the ... and include image-guided biopsy of a tumor or injection of an imaging contrast agent into a hollow structure, such as a blood ...
Lee, VS; Resnick, D; Tiu, SS; Sanger, JJ; Nazzaro, CA; Israel, GM; Simonetti, OP (2004). "MR imaging evaluation of myocardial ... and perfusion, noninvasively using ultra-low dose gadolinium-contrast enhanced MRI. These techniques were applied to the ... As the director of Cardiothoracic MR imaging at NYU, Lee developed new MR methods for fast cardiac imaging and for improved ... Israel, GM; Lee, VS; Edye, M; Krinsky, GA; Lavelle, MT; Diflo, T; Weinreb, JC (2002). "Comprehensive MR imaging evaluation of ...
Color Doppler images are generally combined with gray scale (B-mode) images to display duplex ultrasonography images. Uses ... Finally, applications in quantitative perfusion (relative measurement of blood flow) have emerged for identifying early patient ... in echocardiography to improve delineation of left ventricle for visualizing contractibility of heart muscle after a myocardial ... C-mode: A C-mode image is formed in a plane normal to a B-mode image. A gate that selects data from a specific depth from an A- ...
Gottlieb was the first to suggest that autophagy served a protective role in the setting of myocardial stress. These concepts, ... They also developed advanced proteomic methods to interrogate mitochondria (Mitoplex) and to image mitochondrial turnover ( ... "Dynamic Proteomic and miRNA Analysis of Polysomes from Isolated Mouse Heart After Langendorff Perfusion". Journal of Visualized ... Her research primarily focuses on the molecular basis of myocardial ischemia/reperfusion injury and in developing ways to ...
... or Mpi may refer to: Magnetic particle imaging, an emerging non-invasive tomographic technique Myocardial perfusion imaging ...
This organotechnetium compound is applied for myocardial imaging. The d6 electron configuration is highly stable due to its low ... The first generation do not localize specifically and are considered perfusion agents. Second generation has a peptide based ... They are most widely used as a radiopharmaceutical imaging agent. Most commonly as Coordination complexes, although ... A vast majority of technetium compounds used in radiopharmaceutical imaging and diagnosis are inorganic coordination complexes ...
Validation of fluorescence angiography for intraoperative assessment and quantification of myocardial perfusion] (Dissertation ... "A Review of Indocyanine Green Fluorescent Imaging in Surgery". International Journal of Biomedical Imaging. 2012: 940585. doi: ... ICG is used as a marker in the assessment of the perfusion of tissues and organs in many areas of medicine. The light needed ... A digital video camera allows the absorption of the ICG fluorescence to be recorded in real time, which means that perfusion ...
Imaging tests such as stress radionuclide myocardial perfusion imaging or stress echocardiography can confirm a diagnosis when ... It should be determined if a person is at high risk for myocardial infarction before conducting imaging tests to make a ... Myocardial infarction: diagnosis and investigations - GPnotebook, retrieved November 27, 2006. DE Fenton et al. Myocardial ... Gross examination may reveal signs of myocardial infarction.[citation needed] A one-week-old myocardial infarction of the ...
... and can be aided by the use of different imaging modalities such as magnetic resonance imaging, PET scan, CT scan, and X-ray ... In medical and surgical therapy, revascularization is the restoration of perfusion to a body part or organ that has had ... When those cannot be done, transmyocardial revascularization or percutaneous myocardial revascularization, done with a laser, ... The surgery is also indicated to treat ischemic wounds (inadequate tissue perfusion) in some forms of chronic wounds, such as ...
There are multiple benefits from using radiation from medical imaging. Screening imaging exams are used to catch cancer early, ... Common medical tests and treatments involving radiation include X-rays, CT scans, mammography, lung ventilation and perfusion ... "Acute Myocardial Infarct". Radiologic Clinics of North America. 57 (1): 45-55. doi:10.1016/j.rcl.2018.08.006. ISSN 1557-8275. ... The risk of low dose radiation in medical imaging is unproven. It is difficult to establish risk due to low dose radiation. ...
Radionuclide myocardial perfusion imaging (RMPI) is used to assess the effect of coronary artery disease on the heart. From ... Advanced medical imaging used to be provided only in hospitals and privately owned imaging centers, and, with some notable ... many of the studies on imaging have not taken into account the role of technological improvements in the increase of imaging ... Physicians who own imaging machinery can derive profit by collecting both of these fees. For example, when a patient is seen at ...
The major risk with oral agents is ischemic symptoms (e.g., angina pectoris, myocardial infarction, or stroke) due to an ... and imaging of the head (CAT scan and/or MRI). Since decreasing blood pressure is essential, anti-hypertensive medication is ... is typically transient as the vascular disease tends to resolve and renal perfusion improves over one to three months. ...
... to form two-dimensional images in a similar process to the capture of x-ray images. In contrast, SPECT and positron emission ... The perfusion phase of the test involves the intravenous injection of radioactive technetium macro aggregated albumin (Tc99m- ... and post-stress thallium may indicate areas that will benefit from myocardial revascularization. Redistribution indicates the ... Scintillography is an imaging method of nuclear events provoked by collisions or charged current interactions among nuclear ...
Myocardial perfusion imaging (MPI) is a nuclear medicine procedure that uses special radiotracers to trace how fast they are ... Myocardial perfusion imaging (MPI) is a nuclear medicine procedure that uses special radiotracers (or imaging agents) to trace ... Myocardial Perfusion Imaging (Cardiac Nuclear Medicine Stress Test). Vernon Jubilee Hospital. 2101 - 32nd Street Vernon BC V1T ...
Automatic Quantification of Liver-heart Cross Talk for Quality Assessment in SPECT Myocardial Perfusion Imaging. Title. ... Automatic Quantification of Liver-heart Cross Talk for Quality Assessment in SPECT Myocardial Perfusion Imaging. ... Center for Computational Imaging and Personalized Diagnostics Wickenden 523, 216.368.8519 (legal notice) ...
Angina pectoris is the result of myocardial ischemia caused by an imbalance between myocardial blood supply and oxygen demand. ... Nuclear Imaging. Myocardial perfusion scintigraphy. Thallium Tl 201 and technetium Tc 99m sestamibi are the most frequently ... 4, 24] It increases coronary perfusion and reduces myocardial oxygen demand by diastolic augmentation of the central aortic ... The number of affected myocardial segments is predictive of long-term survival. Smaller perfusion defects are usually ...
Signs of CHF are demonstrated in the image below. ... ECG-gated myocardial perfusion imaging. The high photon flux of ... makes it feasible to acquire myocardial perfusion images in an ECG-gated mode. ECG-gated myocardial perfusion images may be ... ECG-gated SPECT imaging is considered the state of the art of radionuclide myocardial perfusion imaging. [5, 6, 7, 8, 1, 9] ... ECG-gated SPECT imaging is considered the state of the art of radionuclide myocardial perfusion imaging. ...
Myocardial perfusion imaging with contrast echocardiography. / Lindner, Jonathan R.; Kaul, Sanjiv. Clinical Nuclear Cardiology ... Lindner, J. R., & Kaul, S. (2010). Myocardial perfusion imaging with contrast echocardiography. In Clinical Nuclear Cardiology ... Myocardial perfusion imaging with contrast echocardiography. In Clinical Nuclear Cardiology. Elsevier Inc. 2010. p. 297-308 doi ... Lindner, JR & Kaul, S 2010, Myocardial perfusion imaging with contrast echocardiography. in Clinical Nuclear Cardiology. ...
Myocardial perfusion imaging (MPI) identifies abnormalities that occur early in the ischemic cascade leading to angina. ... Myocardial perfusion imaging (MPI) identifies abnormalities that occur early in the ischemic cascade leading to angina. This ... Relationship Between Myocardial Perfusion Imaging Abnormalities on Positron Emission Tomography and Anginal Symptoms, ...
Reliable segmentation of the myocardium offers the potential to perform pixel level perfusion assessment. • A deep learning ... A CMR perfusion sequence provides a time series of 2D images for dynamic contrast enhancement of the heart. Accurate myocardial ... Conclusions: Our results showed that the LV myocardial segmentation of CMR perfusion images is best performed using a ... of the perfusion images is essential for quantitative analysis and it can facilitate automated pixel-wise myocardial perfusion ...
Myocardial perfusion imaging for preoperative risk stratification. Weinstein H, Steingart R. Weinstein H, et al. J Nucl Med. ...
Transmission of hepatitis C virus during myocardial perfusion imaging in an outpatient clinic. Am J Cardiol. 2011;108:126-132. ...
Contrast-enhanced first pass myocardial perfusion imaging: correlation between myocardial blood flow in dogs at rest and during ... A) Perfusion defects detected from change analysis estimated from time-averaged myocardial uptake images at rest and stress ( ... CMR imaging of edema in myocardial infarction using cine balanced steady-state free precession. JACC Cardiovasc Imaging. 2011;4 ... Selective adenosine agonists and myocardial perfusion imaging. J Nucl Cardiol. 2012;19:126-141. ...
Serum caffeine levels after 24-hour abstention: clinical implications on dipyridamole Tl myocardial perfusion imaging. J Nucl ... Xanthine interference with dipyridamole-thallium-201 myocardial imaging. Pharmacother 1995;29:425-7. View abstract. ... False-negative dipyridamole-thallium-201 myocardial imaging after caffeine infusion. J Nucl.Med. 1991;32:1538-1541. View ...
The Association of Alanine Aminotransferase Levels With Myocardial Perfusion Imaging and Cardiovascular Morbidity.. Yardeni D, ... 4-HNE Immunohistochemistry and Image Analysis for Detection of Lipid Peroxidation in Human Liver Samples Using Vitamin E ...
Improved quantification of small hearts for gated myocardial perfusion imaging K. Nakajima, K. Okuda, K. Nystrom, J. Richter, D ... Diagnostic Performance of Artificial Neural Network for Detecting Ischemia in Myocardial Perfusion Imaging ... Diagnostic accuracy of an artificial neural network compared with statistical quantitation of myocardial perfusion images: a ... The added value of ECG-gating for the diagnosis of myocardial infarction using myocardial perfusion scintigraphy and artificial ...
Ammonia N-13 Myocardial Blood Flow Absolute Quantification by PET in Patients With Known or Suspected CAD (Ammonia MAP) ... Myocardial Ischemia , Arteriosclerosis , Vascular Diseases , Coronary Artery Disease , ... myocardial perfusion imaging guidelines when stress perfusion imaging is required Yes for myocardial perfusion imaging ... Not sure for myocardial perfusion imaging guidelines when stress perfusion imaging is required exclusion criteria 2 ...
General Cardiology As It Relates To Image Interpretation. *Risk Stratification. *Myocardial Perfusion Imaging ...
Dynamic CT myocardial perfusion without image registration.. Hubbard L; Malkasian S; Molloi S. Sci Rep; 2022 Jul; 12(1):12608. ... Low dose dynamic CT myocardial perfusion imaging using a statistical iterative reconstruction method.. Tao Y; Chen GH; Hacker ... Correlation of iodine uptake and perfusion parameters between dual-energy CT imaging and first-pass dual-input perfusion CT in ... 4. Dynamic CT perfusion measurement in a cardiac phantom.. Ziemer BP; Hubbard L; Lipinski J; Molloi S. Int J Cardiovasc Imaging ...
Quantification of myocardial perfusion reserve (MPR) using vasodilator stress cardiac magnetic resonance is increasingly used ... MPR index (MPRi) was determined from first-pass myocardial perfusion images during stress and rest using the upslope ratio, ... Relation of Myocardial Perfusion Reserve and Left Ventricular Ejection Fraction in Ischemic and Nonischemic Cardiomyopathy Shuo ... Example of stress perfusion images and the corresponding time intensity curves obtained at stress and rest in a patient with ...
Development of Novel SPECT Radiotracers for Imaging Myocardial Perfusion and Inflammation. June 15. Lisa Mielniczuk, MD, UOHI. ...
Value of C-reactive protein/albumin ratio for predicting ischemia in myocardial perfusion scintigraphy. Mol Imaging Radionucl ...
Staff Clinician for Molecular Biomedical Imaging Laboratory (MBIL) ... Right and left ventricular myocardial perfusion reserves correlate with right ventricular function and pulmonary hemodynamics ... Extracellular volume imaging by magnetic resonance imaging provides insights into overt and sub-clinical myocardial pathology. ... Myocardial T1 and extracellular volume fraction mapping at 3 tesla.. Lee JJLiu SNacif MSUgander MHan JKawel NSibley CTKellman P ...
Stress-rest myocardial perfusion imaging was performed to assess myocardial infarction and perfusion abnormalities (perfusion ... Methods: Before ICD implantation, patients underwent 123-I MIBG and myocardial perfusion imaging. Early and late 123-I MIBG ( ... 123-iodine metaiodobenzylguanidine imaging, implantable cardioverter-defibrillator, sympathetic denervation, ventricular ... Objectives: The purpose of this study was to evaluate whether 123-iodine metaiodobenzylguanidine (123-I MIBG) imaging predicts ...
In a study of 3911 patients given intravenous dipyridamole as an adjunct to thallium myocardial perfusion imaging, two types of ... When thallium myocardial perfusion imaging is performed with intravenous dipyridamole, parenteral aminophylline should be ... Dipyridamole Injection is indicated as an alternative to exercise in thallium myocardial perfusion imaging for the evaluation ... The dose of intravenous Dipyridamole Injection as an adjunct to thallium myocardial perfusion imaging should be adjusted ...
... myocardial perfusion, intraventricular blood flow, tissue viability, and valvular function. Of particular importance to him is ... Magnetic resonance imaging (MRI) is an established medical imaging modality, providing unparalleled soft tissue contrast ... MRI also has the potential to provide more than just anatomical imaging, e.g. image guidance for interventional procedures, ... Specifically, the aim is to improve imaging speed, imaging for MRI-guided interventions, motion robustness, quantification, and ...
Myocardial Perfusion Imaging 2016: Quality, Safety, and Dose. Myocardial Perfusion Imaging 2016: Quality, Safety, and Dose ...
Myocardial Perfusion Imaging. Non-Invasive Stress Testing. C100075. Procedures intended to evaluate cardiac function without ... Myocardial Perfusion Imaging. C102676. A procedure that obtains pictures that reflect blood flow in the heart muscle.. ... Old Myocardial Infarction. C35205. History of Myocardial Infarction. Documented history of previous myocardial infarction (MI ... Medical device that increases myocardial oxygen perfusion while at the same time increasing cardiac output.. Intra-Aortic ...
Positron emission tomography myocardial perfusion imaging (PET MPI) findings predictive of post-liver transplant major adverse ... Background: Positron emission tomography myocardial perfusion imaging (PET MPI) is a noninvasive diagnostic test capable of ... detecting coronary artery disease, structural heart disease and myocardial flow reserve [MFR]. We aimed to determine prognostic ...
... development of quantitative methods for the evaluation of LV function and myocardial perfusion from 2D echocardiographic images ... Precision and accuracy of speckle myocardial imaging in relation with standard Doppler myocardial imaging has still to be ... 4) To test precision and accuracy of 2-D strain and vector velocity imaging by comparison with Doppler myocardial imaging ... 2) To test usefulness of serial Doppler/speckle myocardial imaging measurements for monitoring myocardial function during ...
SPECT myocardial perfusion imaging exams. The goal of the MID is to collect data regarding physician compliance with ... Based on high expenditures and utilization in the Medicare fee-for-service population, the following 11 diagnostic imaging ... of an opportunity to apply to participate in the Medicare Imaging Demonstration (MID) that was authorized by the Medicare ... 10 million project to evaluate the efficacy of decision-support systems for ordering diagnostic imaging studies. This is to ...
... and myocardial perfusion SPECT images. The "findings" section provides annota.... Ver mais detalhes ... Its a image and video database that licenses these media in a price that accords with the type of use, like personal, academic ... It presents images related to the anatomy of the eye, nose and paranasal sinuses, pharynx and larynx, brain, spinal cord, ... It presents images (axial plane) and information related to the anatomy of the human body (head, neck, shouders, upper arm, ...
  • Design 100 consecutive patients investigated by exercise electrocardiography and diagnostic coronary arteriography underwent simultaneous inotropic stress Tc-99m sestamibi SPECT (MIBI) imaging and echocardiography. (bmj.com)
  • ECG-gated images are useful for recognizing artifactual defects caused by attenuation (breast and diaphragm) and thus are useful in the quality control of SPECT imaging. (medscape.com)
  • ECG-gated SPECT imaging is considered the state of the art of radionuclide myocardial perfusion imaging. (medscape.com)
  • It contains seventy teaching cases, presented with relevant clinical information such as case history, imaging/study data, and myocardial perfusion SPECT images. (bvsalud.org)
  • Management of cardiac patients and cardiac imaging. (revespcardiol.org)
  • This review aims to present a comprehensive view of full integration of artificial intelligence into the standard clinical patient management-with a focus on cardiac imaging, but applicable to all information handling-and to discuss current barriers that remain to be overcome before its widespread implementation and integration. (revespcardiol.org)
  • Professor Valentin Fuster, MD, PhD, director of the Mount Sinai Heart Center, New York , says that, "A novel non-invasive cardiac imaging technology is required to further unravel and characterize the disease processes associated with atherosclerosis, in particular those associated with vulnerable plaque formation which is a major risk factor for stroke and heart attacks. (healthjockey.com)
  • The aim of the current study was to evaluate stress speckle tracking to detect myocardial viability in comparison to cardiac MRI in post-STEMI patients. (who.int)
  • Moreover, it carries a promising role in post-myocardial infarction risk stratification with a reasonable prediction of reversible cardiac-related hospital re-admission. (who.int)
  • Thus a new based on Speckle tracking imaging zone, the greater the likelihood of future cardiac death technique, automated function imaging (AFI) allowing and events (8). (who.int)
  • Objective To assess whether inotropic stress myocardial perfusion imaging, echocardiography, or a combination of the two could enhance the detection of multivessel disease, over and above clinical and exercise electrocardiographic data. (bmj.com)
  • The presence of perfusion defects with MIBI imaging or of wall thickening abnormality with echocardiography in at least two coronary artery territories at peak stress was taken as diagnostic of multivessel disease. (bmj.com)
  • Age (p = 0.03), MIBI imaging (p = 0.007), and echocardiography (p = 0.001) were independent predictors of multivessel disease. (bmj.com)
  • Conclusions The assessment of both myocardial perfusion and contractile function by simultaneous inotropic stress MIBI imaging and echocardiography optimises the non-invasive detection of multivessel disease. (bmj.com)
  • 1 The detection of flow heterogeneity forms the conceptual basis for myocardial perfusion imaging, and systolic wall thickening abnormality is readily detected by echocardiography. (bmj.com)
  • As these manifestations occur before the onset of symptoms and electrocardiographic changes, it is not surprising that many studies have shown that exercise and pharmacological stress testing, in conjunction with myocardial perfusion imaging or echocardiography, is superior to electrocardiography for detecting coronary artery disease. (bmj.com)
  • 6-8 Whether the combination of stress myocardial perfusion imaging and echocardiography can enhance the detection of multivessel disease in conjunction with clinical and exercise electrocardiographic variables has not previously been investigated. (bmj.com)
  • Inotropic stress testing (using dobutamine or arbutamine) is a safe, accurate, and increasingly used technique for evaluating coronary artery disease, 9-14 and whether it is used in conjunction with myocardial perfusion imaging or echocardiography, its diagnostic efficacy is similar to dynamic exercise. (bmj.com)
  • Echocardiography is the preferred imaging modality in patients with CHF, with 2-dimensional echocardiography recommended initially. (medscape.com)
  • In a joint report by the American College of Radiology (ACR) and the American College of Cardiology Foundation (ACCF) regarding appropriate use of imaging in HF, the strongest recommendations for newly suspected HF were for echocardiography utilizing 2-dimensional (2D) transthoracic ultrasound and Doppler. (medscape.com)
  • Lindner, JR & Kaul, S 2010, Myocardial perfusion imaging with contrast echocardiography . (elsevierpure.com)
  • Speckle-tracking echocardiography has emerged as a unique technique for accurately evaluating myocardial function by analyzing the motion of speckles identified. (who.int)
  • Dobutamine stress echocardiography was performed 4 days post-infarction accompanied with automated functional imaging analysis of left ventricle during rest and then during low dose stress. (who.int)
  • Speckle-tracking measured under stress may offer an opportunity to improve the detection of dynamic regional abnormalities and myocardial viability. (who.int)
  • Strain rate obtained from speckle tracking during stress is a novel method of detecting myocardial viability after STEMI. (who.int)
  • This prospective study included a total of 74 revascularization using M4S probe in left lateral myocardial infarction patients diagnosed with ST position. (who.int)
  • Myocardial perfusion imaging by 15O-H 2O positron emission tomography predicts clinical revascularization procedures in symptomatic patients with previous coronary artery bypass graft. (au.dk)
  • Flow heterogeneity and systolic wall thickening abnormality are two of the earliest manifestations of myocardial ischaemia. (bmj.com)
  • Myocardial perfusion imaging (MPI) is a nuclear medicine procedure that uses special radiotracers (or imaging agents) to trace how fast they are taken up by the heart muscle. (interiorhealth.ca)
  • A type of nuclear scanning test or myocardial perfusion imaging test, the thallium stress test shows how well blood flows to the heart muscle. (heart.org)
  • Nuclear imaging can be used in the assessment of both heart function and damage in patients with CHF. (medscape.com)
  • Myocardial perfusion was assessed using the transmural perfusion ratio and visual perfusion assessment. (edu.au)
  • The additional use of visual perfusion assessment and the transmural perfusion ratio both increased the specificity to 95%, with sensitivity of 87% and 71%, respectively. (edu.au)
  • The area under the receiver-operating characteristic curve for coronary CTA + visual perfusion assessment was significantly higher than both coronary CTA (0.93 vs. 0.85, p = 0.0003) and coronary CTA + the transmural perfusion ratio (0.93 vs. 0.79, p = 0.0003). (edu.au)
  • Per-vessel and per-patient accuracy for coronary CTA, coronary CTA + the transmural perfusion ratio, and coronary CTA + visual perfusion assessment was 83% and 83%, 87% and 92%, and 92% and 95%, respectively. (edu.au)
  • When interpreted with coronary CTA, visual perfusion assessment provided superior incremental value in the detection of FFR-significant stenoses compared with the quantitative transmural perfusion ratio assessment. (edu.au)
  • and a request for a stress dose and resting dose of 201T1-thallous chloride for a myocardial perfusion scan. (ijpc.com)
  • Unfortunately, implementing a stress-first approach in a nuclear cardiology laboratory involves significant challenges such as the need for attenuation correction, triage of patients to an appropriate protocol, real-time review of stress images, and consideration of differential reimbursement. (wustl.edu)
  • PET-MPI perfusion, MBF, percent ischemia, pharmacologic stress agent, and gated left ventricular ejection fraction/function values will be collected when available, in an anonymous fashion and uploaded into the database. (centerwatch.com)
  • The creation and display of functional images showing where the blood is flowing into the MYOCARDIUM by following over time the distribution of tracers injected into the blood stream. (bvsalud.org)
  • Imaging blood flow to the MYOCARDIUM by following the distribution of radioactively labeled tracers injected into the blood stream. (bvsalud.org)
  • Objectives: We sought to determine the accuracy of combined coronary computed tomography angiography (CTA) and computed tomography stress myocardial perfusion imaging (CTP) in the detection of hemodynamically significant stenoses using fractional flow reserve (FFR) as a reference standard in patients with suspected coronary artery disease. (edu.au)
  • Computed tomography images were assessed by consensus of 2 observers. (edu.au)
  • Research studies have demonstrated clinical value in reviewing the measured blood flow values in addition to reviewing the perfusion images of blood flow into the heart muscle. (centerwatch.com)
  • This technology has also been used in a pre-clinical study to produce the first 3D imaging results. (healthjockey.com)
  • The use of this technology in a pre-clinical study indicates an advanced step taken from transporting this technology from a theoretical concept to an imaging tool. (healthjockey.com)
  • This program seeks to bring the most innovative technology - whether it be next-generation hardware, multiple modalities, advanced image reconstruction or signal-processing methods, new contrast agents or novel applications - to bear on important basic science and clinical issues. (wustl.edu)
  • Our goal is to develop new technologies to complement the already strong research and clinical imaging activities in our community. (wustl.edu)
  • Advancing novel brain imaging technologies into human studies of aging and dementia, clinical trials, and clinical practice. (wustl.edu)
  • Generally, the complexity and severity of a patient's clinical condition should dictate the selection of appropriate imaging procedures or treatments. (bvsalud.org)
  • It presents information, medical images and videos on 1350 topics and themes (from Abducens nerve to Zygote), related to biological and physical sciences, organisms, diseases, chemicals and drugs, ana. (bvsalud.org)
  • Other imaging studies necessary to evaluate other co-existent diseases or other medical consequences of this condition are not considered in this document. (bvsalud.org)
  • 2-4 Although these stress imaging modes show good diagnostic accuracy for the overall detection of coronary artery disease, their ability to identify multivessel involvement correctly is often suboptimal. (bmj.com)
  • Royal Philips Electronics has introduced a new innovation in the medical imaging technology, called the Magnetic Particle Imaging. (healthjockey.com)
  • Through its combined speed, resolution and sensitivity, Magnetic Particle Imaging technology has great potential for this application, and the latest in-vivo imaging results represent a major breakthrough. (healthjockey.com)
  • Senior vice president of Philips Research and head of the Healthcare research program, Henk van Houten, says that, "We are the first in the world to demonstrate that Magnetic Particle Imaging can be used to produce real-time in-vivo images that accurately capture cardiovascular activity. (healthjockey.com)
  • The Magnetic Particle Imaging unites short image acquisition time with high spatial resolution to capture concentration changes that take place as the nano-particles flow in the blood stream. (healthjockey.com)
  • Investigating strain rate obtained with stress speckle tracking after revascularization predicted the extent of myocardial scar, determined by contrast-enhanced magnetic resonance imaging. (who.int)
  • From simple X-ray photographs to computer images produced by magnetic resonance imaging there are a whole range of different techniques available to doctors for looking inside our bodies. (open.edu)
  • JACC: Cardiovascular Imaging , 5 (11), 1097-1111. (edu.au)
  • Background: CTP can be qualitatively assessed by visual interpretation or quantified by the transmural perfusion ratio determined as the ratio of subendocardial to subepicardial contrast attenuation. (edu.au)
  • Examination involves using an echo probe at various positions or windows to obtain views of the heart (thus capturing images/videos for later playback while formally "reading" the study to come up with the findings). (wikipedia.org)
  • Stress-first approaches to myocardial perfusion imaging provide diagnostically and prognostically accurate perfusion data equivalent to a full rest-stress study while saving time in the imaging laboratory and reducing the radiation exposure to patients and laboratory staff. (wustl.edu)
  • Imaging techniques classified as investigational by the FDA have not been considered in developing these criteria, however, study of new equipment and applications should be encouraged. (bvsalud.org)
  • The video clip below will introduce the major imaging modalities in current use in hospitals. (open.edu)
  • Further work has shown that CMR can recently emerged as a quantitative ultrasound technique differentiate between the densely bright infarct core and for accurately evaluating myocardial function by the adjacent peri-infarct zone, which appears with lower analyzing the motion of speckles identified on routine signal intensity because of the admixture of infarct and 2-dimensional sonograms (2, 3, 4). (who.int)
  • Les antécédents et les examens cliniques de 752 patients consultant dans un centre de recherche sur l'endocrinologie et le métabolisme ont été consignés et des analyses en laboratoire ont été réalisées. (who.int)
  • While physicians have used the Ammonia PET test for many years to visualize (image) the blood flow into the heart muscle (perfusion), it is now possible to also measure the flow of blood into the heart muscle. (centerwatch.com)
  • These criteria are intended to guide radiologists, radiation oncologists and referring physicians in making decisions regarding radiologic imaging and treatment. (bvsalud.org)
  • Imaging techniques have long been part of the physician's diagnostic repertoire. (open.edu)
  • MIBI imaging and echocardiographic data were analysed using a 12 segment left ventricular model, and each segment was ascribed to a particular coronary artery territory. (bmj.com)
  • Color information plays a crucial role in digital image processing since it is a robust descriptor that can often improve data compression and simplify scene understanding for humans and automatic vision systems. (mdpi.com)
  • Furthermore, the multivariate nature of color image data requires the design of appropriate models and methods at both the mathematical and percentual/computational levels. (mdpi.com)
  • A transthoracic echocardiogram ( TTE ) is the most common type of echocardiogram , which is a still or moving image of the internal parts of the heart using ultrasound . (wikipedia.org)
  • Ultrasound gel is used to improve the acoustic windows and increase quality of the captured images. (wikipedia.org)
  • Historical Anatomies on the Web is a digital project designed to give Internet users access to high quality images from important anatomical atlases in the Library's collection. (bvsalud.org)
  • It is possible that the images will not show up clearly enough, which can cause a misdiagnosis. (wikipedia.org)
  • This breakthrough technology produces real-time images of blood flow and heart movements. (healthjockey.com)
  • The device emits a silent sound wave that bounces off the heart, creating images of its chambers and valves. (heart.org)
  • Medical imaging is at the heart of contemporary medical practice. (open.edu)
  • It is a non-invasive test that can be done in many settings that include clinic exam room, inpatient rooms, and exam rooms dedicated to echo imaging. (wikipedia.org)
  • This course is about the scientific basis of medical imaging. (open.edu)
  • Very few of us have not had some connection with the techniques and practices of medical imaging. (open.edu)
  • Often, these contacts are in periods of personal drama in which the medical images chart our physical status, the management of a condition and, in some cases, our future. (open.edu)
  • This video compilation is related to the medical imaging part of the course. (open.edu)
  • Well the most common of all the medical imaging techniques is still the conventional X-ray. (open.edu)
  • Disclaimer: The ACR Committee on Appropriateness Criteria and its expert panels have developed criteria for determining appropriate imaging examinations for diagnosis and treatment of specified medical condition(s). (bvsalud.org)
  • La imagen cardiaca es un componente crucial en el abordaje de los pacientes cardiacos, y como tal influye en múltiples partes interrelacionadas del flujo de trabajo clínico: el contacto médico-paciente, la adquisición de imagen, el preprocesamiento y posprocesamiento de imágenes, los informes de estudios, el diagnóstico y el pronóstico, las intervenciones médicas y, por último, el desarrollo del conocimiento a través de la investigación clínica. (revespcardiol.org)
  • This Topic aims to give an overview of the state-of-the-art in color image processing and provide present/future directions in several applicative contexts. (mdpi.com)
  • Retrospective comparison of angiographic and myocardial perfusion imaging criteria for completeness. (bvsalud.org)
  • Updates in Artificial Intelligence for Breast Imaging. (cdc.gov)
  • Research about color presents new challenges since it makes it possible to expand the currently available methods, most of which are limited to the gray-level class of images. (mdpi.com)
  • Imaging is a central feature of contemporary medicine. (open.edu)