Cardiac imaging techniques. Medical search

Myocytes, Cardiac: Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).Cardiac Output: The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).Heart: The hollow, muscular organ that maintains the circulation of the blood.Arrhythmias, Cardiac: Any disturbances of the normal rhythmic beating of the heart or MYOCARDIAL CONTRACTION. Cardiac arrhythmias can be classified by the abnormalities in HEART RATE, disorders of electrical impulse generation, or impulse conduction.Cardiac Surgical Procedures: Surgery performed on the heart.Death, Sudden, Cardiac: Unexpected rapid natural death due to cardiovascular collapse within one hour of initial symptoms. It is usually caused by the worsening of existing heart diseases. The sudden onset of symptoms, such as CHEST PAIN and CARDIAC ARRHYTHMIAS, particularly VENTRICULAR TACHYCARDIA, can lead to the loss of consciousness and cardiac arrest followed by biological death. (from Braunwald's Heart Disease: A Textbook of Cardiovascular Medicine, 7th ed., 2005)Cardiomegaly: Enlargement of the HEART, usually indicated by a cardiothoracic ratio above 0.50. Heart enlargement may involve the right, the left, or both HEART VENTRICLES or HEART ATRIA. Cardiomegaly is a nonspecific symptom seen in patients with chronic systolic heart failure (HEART FAILURE) or several forms of CARDIOMYOPATHIES.Cardiac Tamponade: Compression of the heart by accumulated fluid (PERICARDIAL EFFUSION) or blood (HEMOPERICARDIUM) in the PERICARDIUM surrounding the heart. The affected cardiac functions and CARDIAC OUTPUT can range from minimal to total hemodynamic collapse.Cardiac Pacing, Artificial: Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.Heart Diseases: Pathological conditions involving the HEART including its structural and functional abnormalities.Myocardium: 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.Cardiac Catheterization: Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.Myocardial Contraction: Contractile activity of the MYOCARDIUM.Heart Arrest: Cessation of heart beat or MYOCARDIAL CONTRACTION. If it is treated within a few minutes, heart arrest can be reversed in most cases to normal cardiac rhythm and effective circulation.Heart Ventricles: 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.Myoblasts, Cardiac: Precursor cells destined to differentiate into cardiac myocytes (MYOCYTES, CARDIAC).Heart Failure: 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.Cardiomyopathies: 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).Cardiac Myosins: Myosin type II isoforms found in cardiac muscle.Cardiac Imaging Techniques: Visualization of the heart structure and cardiac blood flow for diagnostic evaluation or to guide cardiac procedures via techniques including ENDOSCOPY (cardiac endoscopy, sometimes refered to as cardioscopy), RADIONUCLIDE IMAGING; MAGNETIC RESONANCE IMAGING; TOMOGRAPHY; or ULTRASONOGRAPHY.Electrocardiography: 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.Cardiac Glycosides: Cyclopentanophenanthrenes with a 5- or 6-membered lactone ring attached at the 17-position and SUGARS attached at the 3-position. Plants they come from have long been used in congestive heart failure. They increase the force of cardiac contraction without significantly affecting other parameters, but are very toxic at larger doses. Their mechanism of action usually involves inhibition of the NA(+)-K(+)-EXCHANGING ATPASE and they are often used in cell biological studies for that purpose.Heart Rate: The number of times the HEART VENTRICLES contract per unit of time, usually per minute.Echocardiography: Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.Cardiac Output, Low: A state of subnormal or depressed cardiac output at rest or during stress. It is a characteristic of CARDIOVASCULAR DISEASES, including congenital, valvular, rheumatic, hypertensive, coronary, and cardiomyopathic. The serious form of low cardiac output is characterized by marked reduction in STROKE VOLUME, and systemic vasoconstriction resulting in cold, pale, and sometimes cyanotic extremities.Out-of-Hospital Cardiac Arrest: Occurrence of heart arrest in an individual when there is no immediate access to medical personnel or equipment.Time Factors: Elements of limited time intervals, contributing to particular results or situations.Hemodynamics: The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.Myocardial Infarction: NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).Cardiac Volume: The volume of the HEART, usually relating to the volume of BLOOD contained within it at various periods of the cardiac cycle. The amount of blood ejected from a ventricle at each beat is STROKE VOLUME.Ventricular Remodeling: The geometric and structural changes that the HEART VENTRICLES undergo, usually following MYOCARDIAL INFARCTION. It comprises expansion of the infarct and dilatation of the healthy ventricle segments. While most prevalent in the left ventricle, it can also occur in the right ventricle.Heart Transplantation: The transference of a heart from one human or animal to another.Troponin I: One of the three polypeptide chains that make up the TROPONIN complex. It inhibits F-actin-myosin interactions.Ventricular Function, Left: 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.Heart Defects, Congenital: Developmental abnormalities involving structures of the heart. These defects are present at birth but may be discovered later in life.Stroke Volume: 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.Blood Pressure: PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.Cardiac Resynchronization Therapy: The restoration of the sequential order of contraction and relaxation of the HEART ATRIA and HEART VENTRICLES by atrio-biventricular pacing.Heart Function Tests: Examinations used to diagnose and treat heart conditions.Troponin T: One of the three polypeptide chains that make up the TROPONIN complex. It is a cardiac-specific protein that binds to TROPOMYOSIN. It is released from damaged or injured heart muscle cells (MYOCYTES, CARDIAC). Defects in the gene encoding troponin T result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.Heart Conduction System: An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.Cardiopulmonary Resuscitation: The artificial substitution of heart and lung action as indicated for HEART ARREST resulting from electric shock, DROWNING, respiratory arrest, or other causes. The two major components of cardiopulmonary resuscitation are artificial ventilation (RESPIRATION, ARTIFICIAL) and closed-chest CARDIAC MASSAGE.Heart Neoplasms: Tumors in any part of the heart. They include primary cardiac tumors and metastatic tumors to the heart. Their interference with normal cardiac functions can cause a wide variety of symptoms including HEART FAILURE; CARDIAC ARRHYTHMIAS; or EMBOLISM.Cardiac Care Facilities: Institutions specializing in the care of patients with heart disorders.Dogs: 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)Cardiomyopathy, Dilated: 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.Ventricular Dysfunction, Left: 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.Cardiotonic Agents: 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).Myocardial Ischemia: 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).Treatment Outcome: 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.Cardiac Electrophysiology: The study of the electrical activity and characteristics of the HEART; MYOCARDIUM; and CARDIOMYOCYTES.Models, Cardiovascular: 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.Fibrosis: Any pathological condition where fibrous connective tissue invades any organ, usually as a consequence of inflammation or other injury.Rats, Sprague-Dawley: A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.Fetal Heart: The heart of the fetus of any viviparous animal. It refers to the heart in the postembryonic period and is differentiated from the embryonic heart (HEART/embryology) only on the basis of time.Calcium: A basic element found in nearly all organized tissues. It is a member of the alkaline earth family of metals with the atomic symbol Ca, atomic number 20, and atomic weight 40. Calcium is the most abundant mineral in the body and combines with phosphorus to form calcium phosphate in the bones and teeth. It is essential for the normal functioning of nerves and muscles and plays a role in blood coagulation (as factor IV) and in many enzymatic processes.Heart Atria: The chambers of the heart, to which the BLOOD returns from the circulation.Prospective Studies: 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.Ventricular Function: The hemodynamic and electrophysiological action of the HEART VENTRICLES.Disease Models, Animal: 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.Cells, Cultured: Cells propagated in vitro in special media conducive to their growth. Cultured cells are used to study developmental, morphologic, metabolic, physiologic, and genetic processes, among others.Heart Injuries: General or unspecified injuries to the heart.Cardiopulmonary Bypass: Diversion of the flow of blood from the entrance of the right atrium directly to the aorta (or femoral artery) via an oxygenator thus bypassing both the heart and lungs.Troponin: One of the minor protein components of skeletal muscle. Its function is to serve as the calcium-binding component in the troponin-tropomyosin B-actin-myosin complex by conferring calcium sensitivity to the cross-linked actin and myosin filaments.Hypertrophy, Left Ventricular: Enlargement of the LEFT VENTRICLE of the heart. This increase in ventricular mass is attributed to sustained abnormal pressure or volume loads and is a contributor to cardiovascular morbidity and mortality.Follow-Up Studies: 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.Myocarditis: Inflammatory processes of the muscular walls of the heart (MYOCARDIUM) which result in injury to the cardiac muscle cells (MYOCYTES, CARDIAC). Manifestations range from subclinical to sudden death (DEATH, SUDDEN). Myocarditis in association with cardiac dysfunction is classified as inflammatory CARDIOMYOPATHY usually caused by INFECTION, autoimmune diseases, or responses to toxic substances. Myocarditis is also a common cause of DILATED CARDIOMYOPATHY and other cardiomyopathies.Mice, Transgenic: Laboratory mice that have been produced from a genetically manipulated EGG or EMBRYO, MAMMALIAN.Isoproterenol: Isopropyl analog of EPINEPHRINE; beta-sympathomimetic that acts on the heart, bronchi, skeletal muscle, alimentary tract, etc. It is used mainly as bronchodilator and heart stimulant.Sarcomeres: The repeating contractile units of the MYOFIBRIL, delimited by Z bands along its length.Atrial Natriuretic Factor: A potent natriuretic and vasodilatory peptide or mixture of different-sized low molecular weight PEPTIDES derived from a common precursor and secreted mainly by the HEART ATRIUM. All these peptides share a sequence of about 20 AMINO ACIDS.Muscle Proteins: The protein constituents of muscle, the major ones being ACTINS and MYOSINS. More than a dozen accessory proteins exist including TROPONIN; TROPOMYOSIN; and DYSTROPHIN.Retrospective Studies: 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.Risk Factors: 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.Mitochondria, Heart: The mitochondria of the myocardium.Heart Valves: Flaps of tissue that prevent regurgitation of BLOOD from the HEART VENTRICLES to the HEART ATRIA or from the PULMONARY ARTERIES or AORTA to the ventricles.Pericardium: 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.Predictive Value of Tests: 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.Rats, Wistar: A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.Pacemaker, Artificial: A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).Edema, Cardiac: Abnormal fluid retention by the body due to impaired cardiac function or heart failure. It is usually characterized by increase in venous and capillary pressure, and swollen legs when standing. It is different from the generalized edema caused by renal dysfunction (NEPHROTIC SYNDROME).Biological Markers: Measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.Mice, Inbred C57BL Magnetic Resonance Imaging, Cine: 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.Postoperative Complications: Pathologic processes that affect patients after a surgical procedure. They may or may not be related to the disease for which the surgery was done, and they may or may not be direct results of the surgery.Ventricular Fibrillation: A potentially lethal cardiac arrhythmia that is characterized by uncoordinated extremely rapid firing of electrical impulses (400-600/min) in HEART VENTRICLES. Such asynchronous ventricular quivering or fibrillation prevents any effective cardiac output and results in unconsciousness (SYNCOPE). It is one of the major electrocardiographic patterns seen with CARDIAC ARREST.Animals, Newborn: Refers to animals in the period of time just after birth.Coronary Circulation: The circulation of blood through the CORONARY VESSELS of the HEART.Natriuretic Peptide, Brain: A PEPTIDE that is secreted by the BRAIN and the HEART ATRIA, stored mainly in cardiac ventricular MYOCARDIUM. It can cause NATRIURESIS; DIURESIS; VASODILATION; and inhibits secretion of RENIN and ALDOSTERONE. It improves heart function. It contains 32 AMINO ACIDS.Myocardial Reperfusion Injury: Damage to the MYOCARDIUM resulting from MYOCARDIAL REPERFUSION (restoration of blood flow to ischemic areas of the HEART.) Reperfusion takes place when there is spontaneous thrombolysis, THROMBOLYTIC THERAPY, collateral flow from other coronary vascular beds, or reversal of vasospasm.Cardiomyopathy, Hypertrophic: 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).Mice, Knockout: Strains of mice in which certain GENES of their GENOMES have been disrupted, or "knocked-out". To produce knockouts, using RECOMBINANT DNA technology, the normal DNA sequence of the gene being studied is altered to prevent synthesis of a normal gene product. Cloned cells in which this DNA alteration is successful are then injected into mouse EMBRYOS to produce chimeric mice. The chimeric mice are then bred to yield a strain in which all the cells of the mouse contain the disrupted gene. Knockout mice are used as EXPERIMENTAL ANIMAL MODELS for diseases (DISEASE MODELS, ANIMAL) and to clarify the functions of the genes.Ventricular Pressure: The pressure within a CARDIAC VENTRICLE. Ventricular pressure waveforms can be measured in the beating heart by catheterization or estimated using imaging techniques (e.g., DOPPLER ECHOCARDIOGRAPHY). The information is useful in evaluating the function of the MYOCARDIUM; CARDIAC VALVES; and PERICARDIUM, particularly with simultaneous measurement of other (e.g., aortic or atrial) pressures.Risk Assessment: 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)Coronary Artery Bypass: 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.Sarcolemma: The excitable plasma membrane of a muscle cell. (Glick, Glossary of Biochemistry and Molecular Biology, 1990)Myosin Heavy Chains: The larger subunits of MYOSINS. The heavy chains have a molecular weight of about 230 kDa and each heavy chain is usually associated with a dissimilar pair of MYOSIN LIGHT CHAINS. The heavy chains possess actin-binding and ATPase activity.Coronary Vessels: The veins and arteries of the HEART.Signal Transduction: The intracellular transfer of information (biological activation/inhibition) through a signal pathway. In each signal transduction system, an activation/inhibition signal from a biologically active molecule (hormone, neurotransmitter) is mediated via the coupling of a receptor/enzyme to a second messenger system or to an ion channel. Signal transduction plays an important role in activating cellular functions, cell differentiation, and cell proliferation. Examples of signal transduction systems are the GAMMA-AMINOBUTYRIC ACID-postsynaptic receptor-calcium ion channel system, the receptor-mediated T-cell activation pathway, and the receptor-mediated activation of phospholipases. Those coupled to membrane depolarization or intracellular release of calcium include the receptor-mediated activation of cytotoxic functions in granulocytes and the synaptic potentiation of protein kinase activation. Some signal transduction pathways may be part of larger signal transduction pathways; for example, protein kinase activation is part of the platelet activation signal pathway.Thermodilution: Measurement of blood flow based on induction at one point of the circulation of a known change in the intravascular heat content of flowing blood and detection of the resultant change in temperature at a point downstream.Diastole: Post-systolic relaxation of the HEART, especially the HEART VENTRICLES.Echocardiography, Doppler: 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.GATA4 Transcription Factor: A GATA transcription factor that is expressed in the MYOCARDIUM of developing heart and has been implicated in the differentiation of CARDIAC MYOCYTES. GATA4 is activated by PHOSPHORYLATION and regulates transcription of cardiac-specific genes.Ventricular Dysfunction: A condition in which HEART VENTRICLES exhibit impaired function.Thoracic Surgery: A surgical specialty concerned with diagnosis and treatment of disorders of the heart, lungs, and esophagus. Two major types of thoracic surgery are classified as pulmonary and cardiovascular.Systole: Period of contraction of the HEART, especially of the HEART VENTRICLES.Pericardial Effusion: Fluid accumulation within the PERICARDIUM. Serous effusions are associated with pericardial diseases. Hemopericardium is associated with trauma. Lipid-containing effusion (chylopericardium) results from leakage of THORACIC DUCT. Severe cases can lead to CARDIAC TAMPONADE.NAV1.5 Voltage-Gated Sodium Channel: A voltage-gated sodium channel subtype that mediates the sodium ion PERMEABILITY of CARDIOMYOCYTES. Defects in the SCN5A gene, which codes for the alpha subunit of this sodium channel, are associated with a variety of CARDIAC DISEASES that result from loss of sodium channel function.Rabbits: The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.Endomyocardial Fibrosis: A condition characterized by the thickening of the ventricular ENDOCARDIUM and subendocardium (MYOCARDIUM), seen mostly in children and young adults in the TROPICAL CLIMATE. The fibrous tissue extends from the apex toward and often involves the HEART VALVES causing restrictive blood flow into the respective ventricles (CARDIOMYOPATHY, RESTRICTIVE).Prognosis: 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.Adrenergic beta-Antagonists: Drugs that bind to but do not activate beta-adrenergic receptors thereby blocking the actions of beta-adrenergic agonists. Adrenergic beta-antagonists are used for treatment of hypertension, cardiac arrhythmias, angina pectoris, glaucoma, migraine headaches, and anxiety.RNA, Messenger: RNA sequences that serve as templates for protein synthesis. Bacterial mRNAs are generally primary transcripts in that they do not require post-transcriptional processing. Eukaryotic mRNA is synthesized in the nucleus and must be exported to the cytoplasm for translation. Most eukaryotic mRNAs have a sequence of polyadenylic acid at the 3' end, referred to as the poly(A) tail. The function of this tail is not known for certain, but it may play a role in the export of mature mRNA from the nucleus as well as in helping stabilize some mRNA molecules by retarding their degradation in the cytoplasm.Exercise Test: 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.Autonomic Nervous System: The ENTERIC NERVOUS SYSTEM; PARASYMPATHETIC NERVOUS SYSTEM; and SYMPATHETIC NERVOUS SYSTEM taken together. Generally speaking, the autonomic nervous system regulates the internal environment during both peaceful activity and physical or emotional stress. Autonomic activity is controlled and integrated by the CENTRAL NERVOUS SYSTEM, especially the HYPOTHALAMUS and the SOLITARY NUCLEUS, which receive information relayed from VISCERAL AFFERENTS.Electrophysiologic Techniques, Cardiac: Methods to induce and measure electrical activities at specific sites in the heart to diagnose and treat problems with the heart's electrical system.Coronary Disease: 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.Long QT Syndrome: A condition that is characterized by episodes of fainting (SYNCOPE) and varying degree of ventricular arrhythmia as indicated by the prolonged QT interval. The inherited forms are caused by mutation of genes encoding cardiac ion channel proteins. The two major forms are ROMANO-WARD SYNDROME and JERVELL-LANGE NIELSEN SYNDROME.Creatine Kinase: A transferase that catalyzes formation of PHOSPHOCREATINE from ATP + CREATINE. The reaction stores ATP energy as phosphocreatine. Three cytoplasmic ISOENZYMES have been identified in human tissues: the MM type from SKELETAL MUSCLE, the MB type from myocardial tissue and the BB type from nervous tissue as well as a mitochondrial isoenzyme. Macro-creatine kinase refers to creatine kinase complexed with other serum proteins.Bradycardia: Cardiac arrhythmias that are characterized by excessively slow HEART RATE, usually below 50 beats per minute in human adults. They can be classified broadly into SINOATRIAL NODE dysfunction and ATRIOVENTRICULAR BLOCK.Vascular Resistance: 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.Oxygen Consumption: 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)Action Potentials: Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.Muscle Cells: Mature contractile cells, commonly known as myocytes, that form one of three kinds of muscle. The three types of muscle cells are skeletal (MUSCLE FIBERS, SKELETAL), cardiac (MYOCYTES, CARDIAC), and smooth (MYOCYTES, SMOOTH MUSCLE). They are derived from embryonic (precursor) muscle cells called MYOBLASTS.Coronary Artery Disease: Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.Myofibrils: The long cylindrical contractile organelles of STRIATED MUSCLE cells composed of ACTIN FILAMENTS; MYOSIN filaments; and other proteins organized in arrays of repeating units called SARCOMERES .Sarcoplasmic Reticulum Calcium-Transporting ATPases: Calcium-transporting ATPases that catalyze the active transport of CALCIUM into the SARCOPLASMIC RETICULUM vesicles from the CYTOPLASM. They are primarily found in MUSCLE CELLS and play a role in the relaxation of MUSCLES.Resuscitation: The restoration to life or consciousness of one apparently dead. (Dorland, 27th ed)Endocardium: The innermost layer of the heart, comprised of endothelial cells.Adrenergic beta-Agonists: Drugs that selectively bind to and activate beta-adrenergic receptors.Troponin C: One of the three polypeptide chains that make up the TROPONIN complex of skeletal muscle. It is a calcium-binding protein.Vagus Nerve: The 10th cranial nerve. The vagus is a mixed nerve which contains somatic afferents (from skin in back of the ear and the external auditory meatus), visceral afferents (from the pharynx, larynx, thorax, and abdomen), parasympathetic efferents (to the thorax and abdomen), and efferents to striated muscle (of the larynx and pharynx).Anti-Arrhythmia Agents: Agents used for the treatment or prevention of cardiac arrhythmias. They may affect the polarization-repolarization phase of the action potential, its excitability or refractoriness, or impulse conduction or membrane responsiveness within cardiac fibers. Anti-arrhythmia agents are often classed into four main groups according to their mechanism of action: sodium channel blockade, beta-adrenergic blockade, repolarization prolongation, or calcium channel blockade.Ventricular Myosins: Isoforms of MYOSIN TYPE II, specifically found in the ventricular muscle of the HEART. Defects in the genes encoding ventricular myosins result in FAMILIAL HYPERTROPHIC CARDIOMYOPATHY.Receptors, Adrenergic, beta: One of two major pharmacologically defined classes of adrenergic receptors. The beta adrenergic receptors play an important role in regulating CARDIAC MUSCLE contraction, SMOOTH MUSCLE relaxation, and GLYCOGENOLYSIS.Defibrillators, Implantable: Implantable devices which continuously monitor the electrical activity of the heart and automatically detect and terminate ventricular tachycardia (TACHYCARDIA, VENTRICULAR) and VENTRICULAR FIBRILLATION. They consist of an impulse generator, batteries, and electrodes.Organ Size: The measurement of an organ in volume, mass, or heaviness.Death: Irreversible cessation of all bodily functions, manifested by absence of spontaneous breathing and total loss of cardiovascular and cerebral functions.Cardiac Resynchronization Therapy Devices: Types of artificial pacemakers with implantable leads to be placed at multiple intracardial sites. They are used to treat various cardiac conduction disturbances which interfere with the timing of contraction of the ventricles. They may or may not include defibrillating electrodes (IMPLANTABLE DEFIBRILLATORS) as well.Ryanodine Receptor Calcium Release Channel: A tetrameric calcium release channel in the SARCOPLASMIC RETICULUM membrane of SMOOTH MUSCLE CELLS, acting oppositely to SARCOPLASMIC RETICULUM CALCIUM-TRANSPORTING ATPASES. It is important in skeletal and cardiac excitation-contraction coupling and studied by using RYANODINE. Abnormalities are implicated in CARDIAC ARRHYTHMIAS and MUSCULAR DISEASES.Advanced Cardiac Life Support: The use of sophisticated methods and equipment to treat cardiopulmonary arrest. Advanced Cardiac Life Support (ACLS) includes the use of specialized equipment to maintain the airway, early defibrillation and pharmacological therapy.Myxoma: A benign neoplasm derived from connective tissue, consisting chiefly of polyhedral and stellate cells that are loosely embedded in a soft mucoid matrix, thereby resembling primitive mesenchymal tissue. It occurs frequently intramuscularly where it may be mistaken for a sarcoma. It appears also in the jaws and the skin. (From Stedman, 25th ed)Papillary Muscles: Conical muscular projections from the walls of the cardiac ventricles, attached to the cusps of the atrioventricular valves by the chordae tendineae.Coronary Angiography: Radiography of the vascular system of the heart muscle after injection of a contrast medium.Angiotensin II: An octapeptide that is a potent but labile vasoconstrictor. It is produced from angiotensin I after the removal of two amino acids at the C-terminal by ANGIOTENSIN CONVERTING ENZYME. The amino acid in position 5 varies in different species. To block VASOCONSTRICTION and HYPERTENSION effect of angiotensin II, patients are often treated with ACE INHIBITORS or with ANGIOTENSIN II TYPE 1 RECEPTOR BLOCKERS.Dose-Response Relationship, Drug: The relationship between the dose of an administered drug and the response of the organism to the drug.Calcium Channels, L-Type: Long-lasting voltage-gated CALCIUM CHANNELS found in both excitable and nonexcitable tissue. They are responsible for normal myocardial and vascular smooth muscle contractility. Five subunits (alpha-1, alpha-2, beta, gamma, and delta) make up the L-type channel. The alpha-1 subunit is the binding site for calcium-based antagonists. Dihydropyridine-based calcium antagonists are used as markers for these binding sites.Tachycardia, Ventricular: An abnormally rapid ventricular rhythm usually in excess of 150 beats per minute. It is generated within the ventricle below the BUNDLE OF HIS, either as autonomic impulse formation or reentrant impulse conduction. Depending on the etiology, onset of ventricular tachycardia can be paroxysmal (sudden) or nonparoxysmal, its wide QRS complexes can be uniform or polymorphic, and the ventricular beating may be independent of the atrial beating (AV dissociation).Purkinje Fibers: Modified cardiac muscle fibers composing the terminal portion of the heart conduction system.3-Iodobenzylguanidine: 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.Hypertension: Persistently high systemic arterial BLOOD PRESSURE. Based on multiple readings (BLOOD PRESSURE DETERMINATION), hypertension is currently defined as when SYSTOLIC PRESSURE is consistently greater than 140 mm Hg or when DIASTOLIC PRESSURE is consistently 90 mm Hg or more.Reproducibility of Results: 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.Guinea Pigs: A common name used for the genus Cavia. The most common species is Cavia porcellus which is the domesticated guinea pig used for pets and biomedical research.Heart Valve Diseases: Pathological conditions involving any of the various HEART VALVES and the associated structures (PAPILLARY MUSCLES and CHORDAE TENDINEAE).Sodium Channels: Ion channels that specifically allow the passage of SODIUM ions. A variety of specific sodium channel subtypes are involved in serving specialized functions such as neuronal signaling, CARDIAC MUSCLE contraction, and KIDNEY function.Cardiovascular System: The HEART and the BLOOD VESSELS by which BLOOD is pumped and circulated through the body.Electric Countershock: An electrical current applied to the HEART to terminate a disturbance of its rhythm, ARRHYTHMIAS, CARDIAC. (Stedman, 25th ed)Gene Expression Regulation: Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation.Myosins: A diverse superfamily of proteins that function as translocating proteins. They share the common characteristics of being able to bind ACTINS and hydrolyze MgATP. Myosins generally consist of heavy chains which are involved in locomotion, and light chains which are involved in regulation. Within the structure of myosin heavy chain are three domains: the head, the neck and the tail. The head region of the heavy chain contains the actin binding domain and MgATPase domain which provides energy for locomotion. The neck region is involved in binding the light-chains. The tail region provides the anchoring point that maintains the position of the heavy chain. The superfamily of myosins is organized into structural classes based upon the type and arrangement of the subunits they contain.Heart Block: Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.Norepinephrine: Precursor of epinephrine that is secreted by the adrenal medulla and is a widespread central and autonomic neurotransmitter. Norepinephrine is the principal transmitter of most postganglionic sympathetic fibers and of the diffuse projection system in the brain arising from the locus ceruleus. It is also found in plants and is used pharmacologically as a sympathomimetic.Sodium-Calcium Exchanger: An electrogenic ion exchange protein that maintains a steady level of calcium by removing an amount of calcium equal to that which enters the cells. It is widely distributed in most excitable membranes, including the brain and heart.Defibrillators: Cardiac electrical stimulators that apply brief high-voltage electroshocks to the HEART. These stimulators are used to restore normal rhythm and contractile function in hearts of patients who are experiencing VENTRICULAR FIBRILLATION or ventricular tachycardia (TACHYCARDIA, VENTRICULAR) that is not accompanied by a palpable PULSE. Some defibrillators may also be used to correct certain noncritical dysrhythmias (called synchronized defibrillation or CARDIOVERSION), using relatively low-level discharges synchronized to the patient's ECG waveform. (UMDNS, 2003)Hypothermia, Induced: Abnormally low BODY TEMPERATURE that is intentionally induced in warm-blooded animals by artificial means. In humans, mild or moderate hypothermia has been used to reduce tissue damages, particularly after cardiac or spinal cord injuries and during subsequent surgeries.Analysis of Variance: A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.Magnetic Resonance Imaging: 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.Cardiology: The study of the heart, its physiology, and its functions.Emergency Medical Services: Services specifically designed, staffed, and equipped for the emergency care of patients.Sensitivity and Specificity: 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)Electrophysiology: The study of the generation and behavior of electrical charges in living organisms particularly the nervous system and the effects of electricity on living organisms.Calcium Signaling: Signal transduction mechanisms whereby calcium mobilization (from outside the cell or from intracellular storage pools) to the cytoplasm is triggered by external stimuli. Calcium signals are often seen to propagate as waves, oscillations, spikes, sparks, or puffs. The calcium acts as an intracellular messenger by activating calcium-responsive proteins.Models, Animal: Non-human animals, selected because of specific characteristics, for use in experimental research, teaching, or testing.Heart Massage: Rhythmic compression of the heart by pressure applied manually over the sternum (closed heart massage) or directly to the heart through an opening in the chest wall (open heart massage). It is done to reinstate and maintain circulation. (Dorland, 28th ed)Cardiac-Gated Imaging Techniques: Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.Electrocardiography, Ambulatory: Method in which prolonged electrocardiographic recordings are made on a portable tape recorder (Holter-type system) or solid-state device ("real-time" system), while the patient undergoes normal daily activities. It is useful in the diagnosis and management of intermittent cardiac arrhythmias and transient myocardial ischemia.Calcium-Binding Proteins: Proteins to which calcium ions are bound. They can act as transport proteins, regulator proteins, or activator proteins. They typically contain EF HAND MOTIFS.Gene Expression: The phenotypic manifestation of a gene or genes by the processes of GENETIC TRANSCRIPTION and GENETIC TRANSLATION.Rhabdomyoma: A benign tumor derived from striated muscle. It is extremely rare, generally occurring in the tongue, neck muscles, larynx, uvula, nasal cavity, axilla, vulva, and heart. These tumors are treated by simple excision. (Dorland, 27th ed; DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1354)Perfusion: Treatment process involving the injection of fluid into an organ or tissue.Cardiography, Impedance: A type of impedance plethysmography in which bioelectrical impedance is measured between electrodes positioned around the neck and around the lower thorax. It is used principally to calculate stroke volume and cardiac volume, but it is also related to myocardial contractility, thoracic fluid content, and circulation to the extremities.Death, Sudden: The abrupt cessation of all vital bodily functions, manifested by the permanent loss of total cerebral, respiratory, and cardiovascular functions.Cardiovascular Agents: Agents that affect the rate or intensity of cardiac contraction, blood vessel diameter, or blood volume.Phosphorylation: The introduction of a phosphoryl group into a compound through the formation of an ester bond between the compound and a phosphorus moiety.Phenotype: The outward appearance of the individual. It is the product of interactions between genes, and between the GENOTYPE and the environment.Blood Circulation: The movement of the BLOOD as it is pumped through the CARDIOVASCULAR SYSTEM.Swine: 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).Muscle, Skeletal: A subtype of striated muscle, attached by TENDONS to the SKELETON. Skeletal muscles are innervated and their movement can be consciously controlled. They are also called voluntary muscles.Survival Rate: The proportion of survivors in a group, e.g., of patients, studied and followed over a period, or the proportion of persons in a specified group alive at the beginning of a time interval who survive to the end of the interval. It is often studied using life table methods.Monitoring, Physiologic: The continuous measurement of physiological processes, blood pressure, heart rate, renal output, reflexes, respiration, etc., in a patient or experimental animal; includes pharmacologic monitoring, the measurement of administered drugs or their metabolites in the blood, tissues, or urine.Dobutamine: 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.Postoperative Period: The period following a surgical operation.Membrane Potentials: The voltage differences across a membrane. For cellular membranes they are computed by subtracting the voltage measured outside the membrane from the voltage measured inside the membrane. They result from differences of inside versus outside concentration of potassium, sodium, chloride, and other ions across cells' or ORGANELLES membranes. For excitable cells, the resting membrane potentials range between -30 and -100 millivolts. Physical, chemical, or electrical stimuli can make a membrane potential more negative (hyperpolarization), or less negative (depolarization).Fibroblasts: Connective tissue cells which secrete an extracellular matrix rich in collagen and other macromolecules.Atrial Fibrillation: Abnormal cardiac rhythm that is characterized by rapid, uncoordinated firing of electrical impulses in the upper chambers of the heart (HEART ATRIA). In such case, blood cannot be effectively pumped into the lower chambers of the heart (HEART VENTRICLES). It is caused by abnormal impulse generation.Diabetic Cardiomyopathies: Diabetes complications in which VENTRICULAR REMODELING in the absence of CORONARY ATHEROSCLEROSIS and hypertension results in cardiac dysfunctions, typically LEFT VENTRICULAR DYSFUNCTION. The changes also result in myocardial hypertrophy, myocardial necrosis and fibrosis, and collagen deposition due to impaired glucose tolerance.Cardiac Output, High: A state of elevated cardiac output due to conditions of either increased hemodynamic demand or reduced cardiac oxygen output. These conditions may include ANEMIA; ARTERIOVENOUS FISTULA; THYROTOXICOSIS; PREGNANCY; EXERCISE; FEVER; and ANOXIA. In time, compensatory changes of the heart can lead to pathological form of high cardiac output and eventual HEART FAILURE.Tachycardia: Abnormally rapid heartbeat, usually with a HEART RATE above 100 beats per minute for adults. Tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.Potassium Channels: Cell membrane glycoproteins that are selectively permeable to potassium ions. At least eight major groups of K channels exist and they are made up of dozens of different subunits.Blotting, Western: Identification of proteins or peptides that have been electrophoretically separated by blot transferring from the electrophoresis gel to strips of nitrocellulose paper, followed by labeling with antibody probes.Heart Arrest, Induced: A procedure to stop the contraction of MYOCARDIUM during HEART SURGERY. It is usually achieved with the use of chemicals (CARDIOPLEGIC SOLUTIONS) or cold temperature (such as chilled perfusate).Patch-Clamp Techniques: An electrophysiologic technique for studying cells, cell membranes, and occasionally isolated organelles. All patch-clamp methods rely on a very high-resistance seal between a micropipette and a membrane; the seal is usually attained by gentle suction. The four most common variants include on-cell patch, inside-out patch, outside-out patch, and whole-cell clamp. Patch-clamp methods are commonly used to voltage clamp, that is control the voltage across the membrane and measure current flow, but current-clamp methods, in which the current is controlled and the voltage is measured, are also used.

Combination of compressed sensing and parallel imaging for highly accelerated first-pass cardiac perfusion MRI. (1/72)

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First experience with microprobe transoesophageal echocardiography in non-sedated adults undergoing atrial fibrillation ablation: feasibility study and comparison with intracardiac echocardiography. (2/72)

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ACCF/SCCT/ACR/AHA/ASE/ASNC/NASCI/SCAI/SCMR 2010 Appropriate Use Criteria for Cardiac Computed Tomography. A Report of the American College of Cardiology Foundation Appropriate Use Criteria Task Force, the Society of Cardiovascular Computed Tomography, the American College of Radiology, the American Heart Association, the American Society of Echocardiography, the American Society of Nuclear Cardiology, the North American Society for Cardiovascular Imaging, the Society for Cardiovascular Angiography and Interventions, and the Society for Cardiovascular Magnetic Resonance. (3/72)

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Embryonic mouse blood flow and oxygen correlate with early pancreatic differentiation. (4/72)

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Ionizing radiation exposure to patients admitted with acute myocardial infarction in the United States. (5/72)

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ACCF/SCCT/ACR/AHA/ASE/ASNC/NASCI/SCAI/SCMR 2010 appropriate use criteria for cardiac computed tomography. A report of the American College of Cardiology Foundation Appropriate Use Criteria Task Force, the Society of Cardiovascular Computed Tomography, the American College of Radiology, the American Heart Association, the American Society of Echocardiography, the American Society of Nuclear Cardiology, the North American Society for Cardiovascular Imaging, the Society for Cardiovascular Angiography and Interventions, and the Society for Cardiovascular Magnetic Resonance. (6/72)

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Cardiac imaging using clinical 1.5 t MRI scanners in a murine ischemia/reperfusion model. (7/72)

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Intracardiac echocardiography for registration of rotational angiography-based left atrial reconstructions: a novel approach integrating two intraprocedural three-dimensional imaging techniques in atrial fibrillation ablation. (8/72)

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Cardiology diagnostic tests and procedures

Cardiac imaging techniques include coronary catheterization, echocardiogram, intravascular ultrasound, and the coronary calcium ... Cardiac stress testing is used to determine to assess cardiac function and to disclose evidence of exertion-related cardiac ...

Cardiac imaging

... techniques include coronary catheterization, echocardiogram, Intravascular ultrasound, Cardiac PET scan, ... Cardiac CT scan and Cardiac MRI. A physician may recommend cardiac imaging to support a diagnosis of a heart condition. Medical ... Stress cardiac imaging is discouraged in the evaluation of patients without cardiac symptoms or in routine follow-ups. Coronary ... Magnetic resonance imaging (originally called nuclear magnetic resonance imaging), an imaging methodology based on aligning the ...

TDI

... may stand for: Tissue doppler imaging, or doppler echocardiography, a type of cardiac imaging technique via ultrasound ... timing synchronization in an image sensor Total dual integrality, a property of matrices in mathematical optimization Transport ...

Magnetic resonance imaging

Cardiac MRI is complementary to other imaging techniques, such as echocardiography, cardiac CT, and nuclear medicine. Its ... Magnetic resonance imaging is a medical imaging technique used in radiology to form pictures of the anatomy and the ... Multinuclear imaging is primarily a research technique at present. However, potential applications include functional imaging ... Paul Lauterbur, developed MRI-related techniques, like the echo-planar imaging (EPI) technique. Mansfield and Lauterbur were ...

Avijit Lahiri

... and developed cardiac imaging protocols and techniques. He has published over 270 peer-reviewed scientific publications 16 book ... Lahiri is the Director of the Cardiac Imaging and Research Department in Wellington Hospital, London. Lahiri's research ... "The role of cardiovascular imaging techniques in the assessm... : Nuclear Medicine Communications". LWW. Retrieved 10 December ... He was a consultant cardiologist and director of cardiac research Institute of Medical Research in Northwick Park Hospital and ...

HARP (algorithm)

In cardiac magnetic resonance imaging, tagging techniques make it possible to capture and store the motion information of ... "Motion estimation from tagged MR images using angle images". Proc Int Conf Imag Proc: 704-708. HARP Overview at Image Analysis ... Harmonic phase (HARP) algorithm is a medical image analysis technique capable of extracting and processing motion information ... The inverse Fourier transform of the filtered image yields a complex harmonic image I k ( y , t ) {\displaystyle I_{k}(\mathbf ...

Silver stain

"A modification of the staining technique of reticular fibres for image analysis of the cardiac collagen network". Cardiovasc. ... The technique has been extended to the study of other biological macromolecules that have been separated in a variety of ... Silver staining is also a technique in traditional stained glass to produce the yellow, brown, or amber shading when painting ... on glass.[citation needed] It is a technique that is often used for realistic hair colors. It was discovered in the 14th ...

VLA

... a view of the heart commonly encountered in medical imaging techniques such as cardiac MRI, single-photon emission computed ...

Magnetic resonance

... an MRI technique to image nerves Cardiac magnetic resonance imaging (CMR), an MRI technique to assess the cardiovascular system ... an MRI technique to image biliary and pancreatic ducts Endorectal coil magnetic resonance imaging, an MRI technique to image ... Magnetic resonance imaging (MRI), a medical imaging technique Functional magnetic resonance imaging (fMRI), an MRI technique to ... an MRI technique to measure tissue stiffness Interventional magnetic resonance imaging (IMRI) a technique using MRI to guide ...

Echocardiography

... was the first of his profession to apply in diagnosing cardiac disease ultrasonic pulse echo imaging technique, which the ... Echocardiography is performed by cardiac sonographers, cardiac physiologists (UK), or physicians trained in echocardiography. ... First, images of the heart are taken "at rest" to acquire a baseline of the patient's wall motion at a resting heart rate. The ... This allows image and Doppler evaluation from a location directly behind the heart. This is known as a transesophageal ...

Cardiac output

Velocity-encoded phase contrast Magnetic Resonance Imaging (MRI) is the most accurate technique for measuring flow in large ... Cardiac input (CI) is the inverse operation of cardiac output. As cardiac output implies the volumetric expression of ejection ... one for each time point in the cardiac cycle. One is an anatomical image and the other is an image in which the signal ... "An evaluation of cardiac output by five arterial pulse contour techniques during cardiac surgery". Anaesthesia. 62 (8): 760-68 ...

Cardiac contractility modulation

... therapy is a contraindication for MRI, a medical imaging technique. The mechanism of action of ... Studies on individual cardiac muscle cells using a patch-clamp technique had already shown, in 1969, that a voltage applied ... Since Cardiac contractility modulation signals are delivered during the absolute refractory period of the cardiac cycle, they ... In Cardiac contractility modulation therapy, electrical stimulation is applied to the cardiac muscle during the absolute ...

Single-photon emission computed tomography

Cardiac gated acquisitions are possible with SPECT, just as with planar imaging techniques such as multi gated acquisition scan ... such as functional cardiac or brain imaging. Myocardial perfusion imaging (MPI) is a form of functional cardiac imaging, used ... tumor imaging, infection (leukocyte) imaging, thyroid imaging or bone scintigraphy. Because SPECT permits accurate localisation ... In the nuclear power sector, the SPECT technique can be applied to image radioisotope distributions in irradiated nuclear fuels ...

Watershed stroke

... atherosclerosis of a large artery Embolism of cardiac origin Occlusion of a small blood vessel Although many imaging techniques ... Imaging studies in severe internal carotid artery (ICA) disease report an incidence of watershed stroke ranging from 19% to 64 ... An echocardiogram may be performed looking for a cardiac source of emboli. Blood tests for risk factors also may be ordered, ... An MRI with special sequences called diffusion-weighted MR imaging (DWI), is very sensitive for locating areas of an ischemic ...

Calcium imaging

Ca2+ imaging was carried out in 1986 in cardiac cells using intensified video cameras. Later development of the technique using ... Calcium imaging is a scientific technique usually carried out in research which is designed to show the calcium (Ca2+) status ... Calcium imaging techniques take advantage of so-called calcium indicators, fluorescent molecules that can respond to the ... Calcium imaging can be used to optically probe intracellular calcium in living animals. This technique has allowed studies of ...

Cardiothoracic anesthesiology

Various techniques are employed to manipulate the data, including Doppler imaging. Transesophageal echocardiography has rapidly ... 4] Many fellowships also offer opportunity to become familiar with anesthetic techniques for pediatric cardiac surgery and ... Echocardiography produces a real-time image of the heart via ultrasound imaging, and can be performed in two or three ... Manual of Cardiac Anesthsia, William A dell, chapter 15, page 387-396, 1984 Stephen J Thomas; Manual of Cardiac Anesthsia, ...

Heart sounds

Clicks - Heart clicks are short, high-pitched sounds that can be appreciated with modern non-invasive imaging techniques. Rubs ... the murmurs can change markedly with the severity of the cardiac disease. An astute physician can sometimes diagnose cardiac ... In cardiac auscultation, an examiner may use a stethoscope to listen for these unique and distinct sounds that provide ... It is best heard at the cardiac apex with the patient in the left lateral decubitus position and holding his breath. The ...

Christopher J. Hardy

... as opposed to viewing groups of images at a later time, and he also developed a technique that improved imaging speed. Both ... May 1993). "Real-time acquisition, display, and interactive graphic control of NMR cardiac profiles and images". Magnetic ... subsystem technologies for use in real time MRI and cardiac MR imaging and spectroscopy. Hardy obtained his Ph.D. from the ... "32-element receiver-coil array for cardiac imaging". Magnetic Resonance in Medicine. 55 (5): 1142-9. doi:10.1002/mrm.20870. PMC ...

Safety of magnetic resonance imaging

Mak GS; Truong QA (2012). "Cardiac CT: Imaging of and Through Cardiac Devices". Curr Cardiovasc Imaging Rep. 5 (5): 328-336. ... Magnetic resonance imaging (MRI) is in general a safe technique, although injuries may occur as a result of failed safety ... This is most marked with high-field machines, and rapid-imaging techniques in which sound pressure levels may reach 120 dB(A) ( ... The part of the body being imaged must lie at the center of the magnet, which is at the absolute center of the tunnel. Because ...

Myocardial perfusion imaging

This scan is done in conjunction with a cardiac stress test. Planar techniques, such as conventional scintigraphy, are rarely ... DePuey, E. Gordon; Garcia, Ernest V.; Berman, Daniel Sholom (2001). Cardiac SPECT Imaging. Lippincott Williams & Wilkins. p. ... In keeping with the concept of comparison images, the second "stress" image was taken 4 hours after "stress" and compared with ... Myocardial Perfusion Imaging at the US National Library of Medicine Medical Subject Headings (MeSH) Lee, J. C.; West, M. J.; ...

Iterative reconstruction

... refers to iterative algorithms used to reconstruct 2D and 3D images in certain imaging techniques. For ... Here is an example that illustrates the benefits of iterative image reconstruction for cardiac MRI. Tomographic reconstruction ... In Magnetic Resonance Imaging it can be used to reconstruct images from data acquired with multiple receive coils and with ... on Medical Imaging. 6 (3): 228-238. doi:10.1109/tmi.1987.4307831. Geman, Stuart; McClure, Donald E. (1985). "Bayesian image ...

Coronary CT calcium scan

Use of new imaging techniques to screen for coronary artery disease". Circulation. 108 (8): e50-3. doi:10.1161/01.CIR. ... The CAC score is an independent marker of risk for cardiac events, cardiac mortality, and all-cause mortality. In addition, it ... "Prognostic Value of Coronary CT Angiography and Calcium Score for Major Adverse Cardiac Events in Outpatients". Retrieved April ... but it can possibly be done from contrast-enhanced images as well, such as in coronary CT angiography. The well-established ...

University of Ottawa Heart Institute

Cell Biology Biomaterials and Regeneration Biomedical Engineering Cardiac Anesthesiology Cardiac Imaging Cardiac Prevention & ... The institute employs all standard imaging modalities and evaluates experimental techniques and applications. UOHI also has the ... the cardiac operating rooms, and the cardiac surgery intensive care unit. UOHI offers specialized cardiac nursing training and ... The Cardiac Prevention and Rehabilitation program focuses its efforts in five areas: cardiac rehabilitation, the Prevention & ...

Pericardial window

Zhao J (Apr 2014). "Does posterior pericardial window technique prevent pericardial tamponade after cardiac surgery?". J Int ... Stuart J. Hutchison (10 December 2008). Pericardial diseases: clinical diagnostic imaging atlas. Elsevier Health Sciences. pp. ... an untreated pericardial effusion can lead to cardiac tamponade and death. The window is usually performed by a cardiac surgeon ... A pericardial window is a cardiac surgical procedure to create a fistula - or "window" - from the pericardial space to the ...

Biopsy

"Imaging of the small bowel in Crohn's disease: a review of old and new techniques". World J. Gastroenterol. 13 (24): 3279-87. ... Mens health - Testicular Biopsy Baim, Donald S. (2006). Grossman's Cardiac Catheterization, Angiography, and Intervention. ... When cancer is suspected, a variety of biopsy techniques can be applied. An excisional biopsy is an attempt to remove an entire ... "High-definition imaging of circulating tumor cells and associated cellular events in non-small cell lung cancer patients: a ...

Charles Mullins (pediatric cardiologist)

He is known for advancing cardiac catheterization techniques to treat congenital heart defects. Mullins was born in Washington ... Before Mullins' work, catheterization labs had been primarily used to image the heart. Mullins worked to advance interventional ... The cardiac catheterization lab at TCH is named for Mullins. The Society for Cardiovascular Angiography and Interventions has ... Mullins authored Cardiac Catheterization in Congenital Heart Disease: Pediatric and Adult in 2006. The book was reviewed in the ...

Israel Cardiac Rhythm Management Devices Market Outlook to 2022 : ReportsnReports

Israel Cardiac Rhythm Management Devices Market Outlook to 2022 Summary... ... 49 Pages Report] Check for Discount on Israel Cardiac Rhythm Management Devices Market Outlook to 2022 report by GlobalData. ... Fluorescence-lifetime imaging microscopy or FLIM is an imaging technique for producing an image based on the differences in the ... Israel Cardiac Rhythm Management Devices Market Outlook to 2022. Summary. GlobalDatas new report, Israel Cardiac Rhythm ...

http://www.reportsnreports.com/reports/688776-israel-cardiac-rhythm-management-devices-market-outlook-to-2022.html

Denmark Cardiac Rhythm Management Devices Market Outlook to 2022 : ReportsnReports

Denmark Cardiac Rhythm Management Devices Market Outlook to 2022 Summary... ... 49 Pages Report] Check for Discount on Denmark Cardiac Rhythm Management Devices Market Outlook to 2022 report by GlobalData. ... Fluorescence-lifetime imaging microscopy or FLIM is an imaging technique for producing an image based on the differences in the ... Denmark Cardiac Rhythm Management Devices Market Outlook to 2022. Summary. GlobalDatas new report, Denmark Cardiac Rhythm ...

http://www.reportsnreports.com/reports/688716-denmark-cardiac-rhythm-management-devices-market-outlook-to-2022.html

Heart researchers develop a new, promising imaging technique for cardiac arrhythmias

... a person dies of sudden cardiac arrest or fibrillation, the most common cause of death worldwide. This is partly due to the ... Heart researchers develop a new, promising imaging technique for cardiac arrhythmias. February 22, 2018, Max Planck Society ... In the future, this newly developed imaging technique may help medical doctors to image and thus identify heart rhythm ... "The key to a better understanding of fibrillation lies in a new, high-resolution imaging technique that allows processes inside ...

https://medicalxpress.com/news/2018-02-heart-imaging-technique-cardiac-arrhythmias.html

Exercise-induced cardiac injury: evidence from novel imaging techniques and highly sensitive cardiac troponin assays.

Prolonged endurance exercise in humans has been associated with an acute impairment in diastolic and systolic cardiac function ... and the release of cardiac troponin. In this chapter, we review recent evidence from studies using novel echocardiographic ... Diagnostic Imaging* / methods. Exercise*. Humans. Physical Endurance. Predictive Value of Tests. Prognosis. Troponin / blood*. ... However, we highlight that exercise-induced cardiac troponin release is not a marker of exercise-induced pathology but likely a ...

http://www.biomedsearch.com/nih/Exercise-induced-cardiac-injury-evidence/22386291.html

Imaging Techniques for Identifying Factors of Sudden Cardiac Death Risk - No Study Results Posted - ClinicalTrials.gov

Imaging Techniques for Identifying Factors of Sudden Cardiac Death Risk. The safety and scientific validity of this study is ... Combined cardiac magnetic resonance imaging and C-reactive protein levels identify a cohort at low risk for defibrillator ... Circ Cardiovasc Imaging. 2012 Mar;5(2):178-86. doi: 10.1161/CIRCIMAGING.111.968024. Epub 2012 Jan 20. ...

https://clinicaltrials.gov/ct2/show/results/NCT00181233?recrs=abc&cond=%22Death%2C+Sudden%2C+Cardiac%22

Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI<...

Kosaka, S., & Makaryus, A. N. (2008). Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI. Current ... Kosaka, Shun ; Makaryus, Amgad N. / Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI. In: ... Kosaka, S & Makaryus, AN 2008, Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI, Current ... Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI. / Kosaka, Shun; Makaryus, Amgad N. ...

https://keio.pure.elsevier.com/en/publications/coronary-angiography-using-noninvasive-imaging-techniques-of-card

Cardiac Investigation-Nuclear and Other Imaging Techniques | eMedMD.com

Cardiac Investigation-Nuclear and Other Imaging Techniques. Cardiac investigation-nuclear and other imaging techniques. ... CARDIAC RADIONUCLIDE IMAGING WRITING GROUP (2009). Appropriate use criteria for cardiac radionuclide imaging: a report of the ... Cardiac MRI. Cardiac MRI can reveal images of spectacular similarity to anatomical cross-sections and is the best method ... Nuclear imaging. Within cardiovascular medicine nuclear imaging is an important technique with the following capacity:. *◆ ...

http://emedmd.com/content/cardiac-investigation%E2%80%94nuclear-and-other-imaging-techniques?page=1

Cardiac Investigation-Nuclear and Other Imaging Techniques | eMedMD.com

http://emedmd.com/content/cardiac-investigation%E2%80%94nuclear-and-other-imaging-techniques?page=6

Piechnik Group - Myocardial functional T1 mapping - Advanced cardiac magnetic resonance imaging techniques - Radcliffe...

The Advanced Cardiovascular Image Analysis group works together with OCMR core lab analysts and clinicians at the frontline CMR ... OCMR has an international reputation for cardiac MRI (CMR) research on all aspects from acquisition biophysics to clinical ... Piechnik Group - Myocardial functional T1 mapping - Advanced cardiac magnetic resonance imaging techniques ... Piechnik Group - Myocardial functional T1 mapping - Advanced cardiac magnetic resonance imaging techniques ...

https://www.rdm.ox.ac.uk/study-with-us/projects-2018/piechnik-group-myocardial-functional-t1-mapping-2013-advanced-cardiac-magnetic-resonance-imaging-techniques

Cardiac imaging - Wikipedia

These cardiac techniques are otherwise referred to as echocardiography, Cardiac MRI, Cardiac CT, Cardiac PET and Cardiac SPECT ... Cardiac imaging refers to non-invasive imaging of the heart using ultrasound, magnetic resonance imaging (MRI), computed ... Associated cardiac imaging techniquesEdit. Coronary catheterizationEdit. A coronary angiogram showing the left coronary ... Stress cardiac imaging is discouraged in the evaluation of patients without cardiac symptoms or in routine follow-ups.[2] ...

https://en.m.wikipedia.org/wiki/Cardiac_imaging

Reproducibility of regional- and global left-ventricular strain analyzes using tagging and feature tracking techniques - a...

... a cardiac magnetic resonance imaging study in healthy volunteers. ... Standard cine images were assessed using a balanced steady-state free precession sequence. Tagging images were generated using ... Cine images were analyzed by the feature tracking module of cvi42, Circle Cardiovascular Imaging, Calgary, Canada. For the ... imaging. Some of these techniques, such as tagging, require dedicated CMR sequences at the time of the examination. Other ...

https://jcmr-online.biomedcentral.com/articles/10.1186/1532-429X-18-S1-P58

Ultra low-dose of gadobenate dime... preview & related info | Mendeley

Cardiac imaging techniques. *Gd-BOPTA. *Image quality enhancement. *Magnetic resonance imaging. Get free article suggestions ... Conclusion The use of a 0.05 mmol/kg dose of gadobenate dimeglumine is feasible for LGE imaging of acute MI and the best image ... Results 102 LGE images were evaluated for each dose group. Quality score was significantly higher for SD at 1, 15 and 20 min ( ... However, the standard dose of 0.1 mmol/kg provides overall better image quality, with the best performance obtained at the ...

https://www.mendeley.com/research-papers/ultra-lowdose-gadobenate-dimeglumine-late-gadolinium-enhancement-lge-imaging-acute-myocardial-infarc/

Medical Xpress - images

New cardiac imaging technique shortens testing time, improves patient comfort. A team of Cedars-Sinai investigators has ... Image. An image (from Latin imago) is an artifact, or has to do with a two-dimensional (a picture), that has a similar ... developed a new technique for conducting cardiac magnetic resonance imaging (MRI) tests that improves patient comfort, shortens ... A mental image exists in an individuals mind: something one remembers or imagines. The subject of an image need not be real; ...

https://medicalxpress.com/tags/images/sort/liverank/1m/

Cardiology - Medical School Crash Course (Audiobook) by AudioLearn Medical Content Team | Audible.com

Cardiac imaging techniques and evaluation *Congestive heart failure *Acute myocardial infarction *Ventricular cardiac ...

https://www.audible.com/pd/Cardiology-Medical-School-Crash-Course-Audiobook/B07FK7YFQL

FDA clears AI-based device for diabetic eye disease detection - Verdict Medical Devices

If the images show more than mild diabetic retinopathy, the software refers to an eye care professional for further assessments ... The software is installed on a cloud server and employs an AI algorithm to examine the uploaded eye images that are captured ... "The software is installed on a cloud server and employs an AI algorithm to examine the uploaded eye images that are captured ... The FDA decision is based on the findings from a clinical study that involved retinal images from 900 diabetes patients at ten ...

https://www.medicaldevice-network.com/news/fda-clears-ai-based-device-diabetic-eye-disease-detection/

Scientists teach computers to analyse brain cells - Verdict Medical Devices

Cardiac imaging technique shortens testing time and improves accuracy. *. 10 Apr2018 ... This image shows the program thinking, as it considers what cellular structures to identify. Credit: Dr Finkbeiner, Gladstone ... While the technology shows promise, it requires very large datasets of around 15,000 images to be effective. There is also the ... To test whether the programme had learned from this data, the researchers challenged it with new unlabelled images and found ...

https://www.medicaldevice-network.com/news/scientists-teach-computers-analyse-brain-cells/

The Heart in Systemic Autoimmune Diseases, Volume 14 - 2nd Edition

Chapter 9. New Cardiac Imaging Tools and Invasive Techniques in Systemic Autoimmune Diseases (Part II) ...

https://www.elsevier.com/books/the-heart-in-systemic-autoimmune-diseases/atzeni/978-0-12-803997-7

What is Perfusion Scanning?

Perfusion scanning is basically and advanced form of medical imaging that aims to see the passage of fluids through body ... Cardiac Perfusion Imaging Techniques. Visualising perfusion is done with standard imaging techniques such as computer ... Having a Cardiac Perfusion Scan. A cardiac perfusion scan is used to find out how well blood is flowing through the muscles of ... After a Cardiac Perfusion Scan. It is possible to do the exercise test and the at rest test on the same day, or it may be ...

http://www.cardiacmatters.co.uk/what-perfusion-scanning.html

Timur Paul Sarac, MD > Surgery | Yale School of...

Cardiac Imaging Techniques. Patient Care. Accepts new patients? Yes. Patient Type: Adult; Geriatric. Referrals: From patients ...

http://medicine.yale.edu/surgery/specialties/timur_sarac-3.profile

Behçet's disease and cardiovascular involvement.

Previous Document: Cardiac involvement in small and medium-sized vessel vasculitides.. Next Document: Cardiac imaging ... The incidence and nature of cardiac involvement are not clearly elucidated. Cardiovascular manifestations have been reported in ... 9349385 - Effect of at1 receptor blockade on cardiac collagen remodeling after myocardial infarct.... ...

http://www.biomedsearch.com/nih/disease-cardiovascular-involvement/16218475.html

Acute Myocardial Infarct Imaging: Overview, Radiography, Computed Tomography

... is a condition characterized by ischemic injury and necrosis of the cardiac muscle. Ischemic injury occurs when the blood ... Nuclear cardiac-imaging techniques may be useful for detecting MI; assessing infarct size, collateral flow, and jeopardized ... For the diagnosis of MI, cardiac radionuclide imaging should be restricted to special, limited situations in which the triad of ... Nuclear Imaging. Radionuclide angiography, perfusion imaging, infarct-avid scintigraphy, and PET have been used to evaluate ...

https://emedicine.medscape.com/article/350175-overview

Pediatric Cardiology

Cutting-edge cardiac imaging techniques. *Diagnostic and interventional cardiac catheterization. *Echocardiography (2-D and 3-D ... An experienced, multi-disciplinary team of physicians and healthcare specialists makes up the pediatric cardiac team at the ...

https://www.hopkinsmedicine.org/heart_vascular_institute/clinical_services/specialty_areas/pediatric_cardiology.html

Anatomy of the Heart

... in the area of cardiac imaging techniques. From a previous era of imaging by silhouettes (chest roentgenography, fluoroscopy, ... ANATOMIC BASIS FOR VARIOUS CARDIAC IMAGING TECHNIQUES. During the last several years, dramatic developments have taken place in ... Tomographic views of normal and abnormal hearts: The anatomic basis for various cardiac imaging techniques. Clin Cardiol 13:: ... The newer cardiac imaging modalities (MR1, cine CT, positron emission tomography) not only provide depic-tion of cardiac ...

http://rjmatthewsmd.com/Definitions/anatomy_ofthe_heart.htm

The Heart in Systemic Autoimmune Diseases, Volume 14 - 1st Edition

Cardiac involvement in autoimmune connective tissue diseases. Cardiac imaging techniques in systemic autoimmune diseases (M. ... Turiel, P. Sarzi-Puttini, R. Cervera). Cardiac involvement in rheumatoid arthritis (N.T. Goodson). Cardiac involvement in ... Part I. Immune and autoimmune mechanisms involved in cardiac damage. Cellular immunity: A role for cytokines (D-L.Fearweather, ... In the first part, the immune mechanisms involved in cardiac damage have been considered. The role of proinflammatory and ...

https://www.elsevier.com/books/the-heart-in-systemic-autoimmune-diseases/asherson/978-0-444-51398-4

Cardiac imaging techniques include coronary catheterization, echocardiogram, intravascular ultrasound, and the coronary calcium scan. (wikipedia.org)
He is known for advancing cardiac catheterization techniques to treat congenital heart defects. (wikipedia.org)
Mullins became known for his work with cardiac catheterization. (wikipedia.org)
Before Mullins' work, catheterization labs had been primarily used to image the heart. (wikipedia.org)
Mullins introduced a sheath and introducer system for carrying out cardiac catheterization and he pioneered the use of endovascular stents to treat children with heart defects. (wikipedia.org)
The cardiac catheterization lab at TCH is named for Mullins. (wikipedia.org)
Mullins authored Cardiac Catheterization in Congenital Heart Disease: Pediatric and Adult in 2006. (wikipedia.org)

Materials and methods 17 consecutive patients (mean age, 60.1 ± 10.3 years) with ST-segment elevation AMI underwent two randomized cardiac magnetic resonance studies (exam intervals between 24 and 48 h) on a 1.5 T unit during the first week after the event using gadobenate dimeglumine (Gd-BOPTA) at the dose of 0.1 mmol/kg BW (standard dose or SD group) and 0.05 mmol/kg BW (half dose or HD group). (mendeley.com)

Imaging can be performed at rest or with stress (exercise or pharmacological), comparison allowing determination of whether regional perfusion is normal, or there is ischaemia, or there is infarction/scar. (emedmd.com)
Myocardial perfusion imaging is minimally invasive, and-in contrast to other methods of investigation-is not limited by exercise capacity, airways disease, abnormalities of the resting ECG, pacemakers, or acoustic windows. (emedmd.com)
Indeed, it is very difficult to identify any patient who is not suitable for nuclear perfusion imaging, and as a result the technique has matured into an almost comprehensive procedure for assessment of coronary artery disease. (emedmd.com)
Rest and peak stress images are required to assess for reversible ischaemia, and comparison of these images determines whether regional perfusion is normal (no hypoperfusion), or due to infarction/scar (hypoperfusion at rest and stress) or ischaemia (hypoperfusion at stress only). (emedmd.com)
These cardiac techniques are otherwise referred to as echocardiography , Cardiac MRI , Cardiac CT , Cardiac PET and Cardiac SPECT myocardial perfusion imaging . (wikipedia.org)
Perfusion scanning is basically and advanced form of medical imaging that aims to 'see' the passage of fluids through body tissues. (cardiacmatters.co.uk)
Visualising perfusion is done with standard imaging techniques such as computer tomography (CT) scanning and magnetic resonance imaging scanning (MRI). (cardiacmatters.co.uk)
CT perfusion scanning is a new technique that is only applied to the brain so far. (cardiacmatters.co.uk)
A cardiac perfusion scan is used to find out how well blood is flowing through the muscles of the heart. (cardiacmatters.co.uk)

Purpose To assess the feasibility of using an ultra-low dose (0.05 mmol/kg of body weight [BW]) of high relaxivity contrast agent for late gadolinium enhancement (LGE) imaging in patients with acute myocardial infarction (AMI). (mendeley.com)

Cardiac involvement in rheumatoid arthritis (N.T. Goodson). (elsevier.com)

Intravascular cardiac lipoproteinosis: extrarenal manifestation of lipoprotein glomerulopathy. (mayo.edu)
Intravascular ultrasound, also known as a percutaneous echocardiogram is an imaging methodology using specially designed, long, thin, complex manufactured catheters attached to computerized ultrasound equipment to visualize the lumen and the interior wall of blood vessels. (wikipedia.org)

Cardiac MRI can reveal images of spectacular similarity to anatomical cross-sections and is the best method available for quantifying ventricular volumes, ejection fraction, myocardial mass, and differentiating viable (preserved myocytes) from nonviable (fibrotic) myocardium (although echocardiography-which is cheaper and more readily available-remains the first choice in routine clinical practice for many of these indications). (emedmd.com)
[ 1 ] or by performing imaging with 2-dimensional (2-D) echocardiography or magnetic resonance imaging (MRI). (medscape.com)

Diagnostic imaging in cardiac diagnosis]. (nih.gov)

High-risk markers on SPECT provide additional prognostic value to clinical and electrocardiographic variables, and decisions about revascularization can be usefully informed by SPECT imaging. (emedmd.com)
ECG-gated SPECT allows images to be taken throughout the cardiac cycle, when comparison of end-systolic and end-diastolic images then allows volumetric analysis and calculation of left ventricular ejection fraction. (emedmd.com)

The incidence and nature of cardiac involvement are not clearly elucidated. (biomedsearch.com)
Cardiac involvement in small and medium-sized vessel vasculitides. (biomedsearch.com)
Cardiac involvement in autoimmune connective tissue diseases. (elsevier.com)
Cardiac involvement in systemic lupus erythematosus (A. Doria, M. Petri). (elsevier.com)
Cardiac involvement in the antiphospholipid syndrome (D. Erkan, M. Roman et al. ). (elsevier.com)

Prolonged endurance exercise in humans has been associated with an acute impairment in diastolic and systolic cardiac function and the release of cardiac troponin. (biomedsearch.com)
A single MDCT scan in the emergency department is valuable in ruling out both cardiac and noncardiac causes of acute chest pain. (elsevier.com)
Conclusion The use of a 0.05 mmol/kg dose of gadobenate dimeglumine is feasible for LGE imaging of acute MI and the best image quality is obtained at 5 min after contrast administration. (mendeley.com)
Acute myocardial infarct (MI), commonly known as a heart attack, is a condition characterized by ischemic injury and necrosis of the cardiac muscle. (medscape.com)
Imaging is also useful in detecting pericardial effusion, concomitant valvular or congenital heart disease, and marked depression of ventricular function that may interdict treatment in the acute phase with beta-adrenergic blockers. (medscape.com)

In this chapter, we review recent evidence from studies using novel echocardiographic parameters and highly sensitive cardiac troponin assays. (biomedsearch.com)

Positron emission tomography (PET), a nuclear medicine imaging methodology for positron emitting radioisotopes . (wikipedia.org)
Magnetic resonance imaging (originally called nuclear magnetic resonance imaging), an imaging methodology based on aligning the spin axis of nuclei within molecules of the object being visualized using both powerful superconducting magnets and radio frequency signals and detectors. (wikipedia.org)

A typical coronary CT calcium scan is done without the use of radiocontrast , but it can possibly be done from contrast-enhanced images as well, such as in coronary CT angiography . (wikipedia.org)

A small cardiac silhouette and clear lung fields in a patient with systemic hypotension may indicate relative or absolute hypovolemia. (medscape.com)
A large cardiac silhouette with similar hemodynamics may reflect hemopericardium and tamponade or right ventricular (RV) MI that is compromising cardiac output. (medscape.com)
The components that form the cardiac silhouette can be readily identified from A above. (rjmatthewsmd.com)

Radionuclide ventriculography where scintigraphic data is acquired during repeated cardiac cycles at specific times in the cycle, using an electrocardiographic synchronizer or gating device. (umassmed.edu)

An experienced, multi-disciplinary team of physicians and healthcare specialists makes up the pediatric cardiac team at the Johns Hopkins Hospital. (hopkinsmedicine.org)

Standard cine images were assessed using a balanced steady-state free precession sequence. (biomedcentral.com)
Other methods, mostly applied on the heart, rely on separately acquired balanced Steady State Free Precession (b-SSFP) MR images, after which the segmentations are superimposed on the 4D Flow MRI. (diva-portal.org)

Cardiac magnetic resonance (MR) currently lacks the spatial resolution of MDCT limiting its assessment of the coronary vasculature, but the proximal coronary arteries can be evaluated along with myocardial function and viability without exposure to contrast dye or ionizing radiation. (elsevier.com)
Cardiac PET studies tend to be confined to research institutions, with the metabolic tracer FDG considered to be the 'gold standard' for assessment of myocardial viability. (emedmd.com)
Here we describe new imaging methodology and present several ubiquitous and tissue-specific luciferase-based transgenic lines, which we have termed zebraflash , that facilitate the assessment of regeneration and engraftment in freely moving adult zebrafish. (zfin.org)
The proposed method enables automated and reproducible image quality assessment. (springer.com)
Automated assessment potentially allows for more standardised image quality. (springer.com)
Image quality assessment enables standardization of clinical trial results across different datasets. (springer.com)

Thanks to a new method of analysing ultrasound images, conventional scanners can be used for generating high-res images of blood vessels in tumours. (medicalxpress.com)
Four-dimensional (4D) flow magnetic resonance imaging (4D Flow MRI) enables acquisition of time-resolved three-directional velocity data in the entire heart and all major thoracic vessels. (diva-portal.org)

Cardiac stress testing is used to determine to assess cardiac function and to disclose evidence of exertion-related cardiac hypoxia. (wikipedia.org)

Finally, we discuss the potential link between prolonged exercise and the increased incidence of cardiac pathology in veteran athletes. (biomedsearch.com)

However, we highlight that exercise-induced cardiac troponin release is not a marker of exercise-induced pathology but likely a physiologic response to exercise. (biomedsearch.com)

Finally, in the third part, the cardiac manifestations observed in the major systemic autoimmune conditions have been comprehensively examined. (elsevier.com)

While b-SSFP images typically cover the whole cardiac cycle and have good contrast, they suffer from a number of problems, such as large slice thickness, limited coverage of the cardiac anatomy, and being prone to displacement errors caused by respiratory motion. (diva-portal.org)

From ultrasound images (left), Max Planck researchers have reconstructed how the heart muscle contracts vortex-like (centre) in cardiac arrhythmia. (medicalxpress.com)
In the future, this newly developed imaging technique may help medical doctors to image and thus identify heart rhythm disorders, helping them to better understand cardiac disease and further develop new, more effective methods for treatment. (medicalxpress.com)
The key to a better understanding of fibrillation lies in a new, high-resolution imaging technique that allows processes inside the heart muscle to be observed," says Stefan Luther, Leader of the Biomedical Physics Research Group at the Max Planck Institute for Dynamics and Self-Organization and Professor at University Medical Center Göttingen. (medicalxpress.com)
With the new form of ultrasound imaging, researchers could learn how to use low-energy pulses to restore normal heart rhythm. (medicalxpress.com)
It is the most commonly used imaging tool for diagnosing heart problems, as it allows non-invasive visualization of the heart and the blood flow through the heart, using a technique known as Doppler. (wikipedia.org)
Image quality can be reduced by the continuous movement of heart structures. (wikipedia.org)
The images produced can show how blood is flowing through the heart walls and can detect any blockages in the coronary arteries. (cardiacmatters.co.uk)
This information can be very useful for a cardiac surgeon who later needs to perform a coronary artery bypass graft on the heart. (cardiacmatters.co.uk)
In the normal heart, this structure forms the rightward and anterior part of the cardiac mass, overlapping the right hand margin of the left atrium and communicating with the right ventricle to its right side (fig. 4.10a). (rjmatthewsmd.com)
We show that luciferase-based live imaging reliably estimates muscle quantity in an internal organ, the heart, and can longitudinally follow cardiac regeneration in individual animals after major injury. (zfin.org)

Every five minutes in Germany alone, a person dies of sudden cardiac arrest or fibrillation, the most common cause of death worldwide. (medicalxpress.com)
MI may also manifest itself as sudden cardiac death, which may not be apparent on autopsy (because necrosis takes time to develop). (medscape.com)

Techniques for the evaluation of regional- and global left-ventricular wall motion parameters based on strain analyzes are emerging in cardiac magnetic resonance (CMR) imaging. (biomedcentral.com)

PET enables visual image analysis of multiple different metabolic chemical processes and is thus one of the most flexible imaging technologies. (wikipedia.org)
A fixed image, also called a hard copy, is one that has been recorded on a material object, such as paper or textile by photography or digital processes. (medicalxpress.com)

Other approaches are based on post-processing of routine imaging studies such as feature-tracking. (biomedcentral.com)

Images reliably identify thin-capped fibroatheromas and other plaque features. (frontiersin.org)

Magnetic resonance imaging is an imaging methodology based on aligning the spin axis of nuclei within molecules of the object being visualized using both powerful superconducting magnets and radio frequency signals and detectors . (wikipedia.org)

The CAC score is an independent marker of risk for cardiac events, cardiac mortality, and all-cause mortality. (wikipedia.org)

Several case reports of IVUS in intracranial arteries show the technique to be feasible and indicate it may improve stent placement. (frontiersin.org)

If the images show more than mild diabetic retinopathy, the software refers to an eye care professional for further assessments or suggests a rescreen after 12 months in case of negative results for more than a mild version of the condition. (medicaldevice-network.com)

Great development and growth will be seen in the short term, allowing radiologists to diagnose cardiac artery disease without anesthesia and in a non-invasive way. (wikipedia.org)
The fluids can be oxygenated blood, deoxygenated blood or lymph and the technique can diagnose a variety of health problems. (cardiacmatters.co.uk)

Tagging images were generated using a spatial modulation of magnetization sequence. (biomedcentral.com)

Currently, multidetector CT, specially the 64 detector-CT are allowing to make cardiac studies in just a few seconds (less than 10 seconds, depending on the equipment and protocol used). (wikipedia.org)

Quantitative analysis of LGE were performed by measuring signal intensity (SI), signal-to-noise ratio (SNR) in the infarcted myocardium (IM), non-infarcted myocardium (N-IM) and left ventricular cavity (LVC) in images acquired at 1, 3, 5, 10, 15 and 20 min after administration of Gd-BOPTA using both contrast media protocol. (mendeley.com)

In this wider sense, images can also be rendered manually, such as by drawing, painting, carving, rendered automatically by printing or computer graphics technology, or developed by a combination of methods, especially in a pseudo-photograph. (medicalxpress.com)
The role of advanced cardiac imaging methods in coronary artery disease]. (nih.gov)
Comparison of manual and automatic segmentations of the cardiac chambers at end-systolic and end-diastolic timeframes showed agreements comparable to those previously reported for automatic segmentation methods of b-SSFP MR images. (diva-portal.org)

The word image is also used in the broader sense of any two-dimensional figure such as a map, a graph, a pie chart, or an abstract painting. (medicalxpress.com)

Gated Blood-Pool Imaging" is a descriptor in the National Library of Medicine's controlled vocabulary thesaurus, MeSH (Medical Subject Headings) . (umassmed.edu)

Combination of compressed sensing and parallel imaging for highly accelerated first-pass cardiac perfusion MRI. (1/72)

First experience with microprobe transoesophageal echocardiography in non-sedated adults undergoing atrial fibrillation ablation: feasibility study and comparison with intracardiac echocardiography. (2/72)

Embryonic mouse blood flow and oxygen correlate with early pancreatic differentiation. (4/72)

Ionizing radiation exposure to patients admitted with acute myocardial infarction in the United States. (5/72)

Cardiac imaging using clinical 1.5 t MRI scanners in a murine ischemia/reperfusion model. (7/72)

Intracardiac echocardiography for registration of rotational angiography-based left atrial reconstructions: a novel approach integrating two intraprocedural three-dimensional imaging techniques in atrial fibrillation ablation. (8/72)

Cardiology diagnostic tests and procedures

Cardiac imaging

TDI

Magnetic resonance imaging

Avijit Lahiri

HARP (algorithm)

Silver stain

VLA

Magnetic resonance

Echocardiography

Cardiac output

Cardiac contractility modulation

Single-photon emission computed tomography

Watershed stroke

Calcium imaging

Cardiothoracic anesthesiology

Heart sounds

Christopher J. Hardy

Safety of magnetic resonance imaging

Myocardial perfusion imaging

Iterative reconstruction

Coronary CT calcium scan

University of Ottawa Heart Institute

Pericardial window

Biopsy

Charles Mullins (pediatric cardiologist)

Israel Cardiac Rhythm Management Devices Market Outlook to 2022 : ReportsnReports

Denmark Cardiac Rhythm Management Devices Market Outlook to 2022 : ReportsnReports

Heart researchers develop a new, promising imaging technique for cardiac arrhythmias

Exercise-induced cardiac injury: evidence from novel imaging techniques and highly sensitive cardiac troponin assays.

Imaging Techniques for Identifying Factors of Sudden Cardiac Death Risk - No Study Results Posted - ClinicalTrials.gov

Coronary angiography using noninvasive imaging techniques of cardiac CT and MRI<...

Cardiac Investigation-Nuclear and Other Imaging Techniques | eMedMD.com

Cardiac Investigation-Nuclear and Other Imaging Techniques | eMedMD.com

Piechnik Group - Myocardial functional T1 mapping - Advanced cardiac magnetic resonance imaging techniques - Radcliffe...

Cardiac imaging - Wikipedia

Reproducibility of regional- and global left-ventricular strain analyzes using tagging and feature tracking techniques - a...

Ultra low-dose of gadobenate dime... preview & related info | Mendeley

Medical Xpress - images

Similar articles for PubMed (Select 21775249) - PubMed - NCBI

Cardiology - Medical School Crash Course (Audiobook) by AudioLearn Medical Content Team | Audible.com

FDA clears AI-based device for diabetic eye disease detection - Verdict Medical Devices

Scientists teach computers to analyse brain cells - Verdict Medical Devices

The Heart in Systemic Autoimmune Diseases, Volume 14 - 2nd Edition

What is Perfusion Scanning?

Timur Paul Sarac, MD > Surgery | Yale School of...

Behçet's disease and cardiovascular involvement.

Acute Myocardial Infarct Imaging: Overview, Radiography, Computed Tomography

Pediatric Cardiology

Anatomy of the Heart

The Heart in Systemic Autoimmune Diseases, Volume 14 - 1st Edition

Catheterization7

Randomized cardiac magnetic1

Perfusion9

Late gadolinium enhancement1

Rheumatoid Arthritis1

Intravascular2

Echocardiography2

Diagnostic Imaging1

SPECT2

Involvement5

Acute5

Echocardiographic1

Nuclear2

Angiography1

Silhouette3

Radionuclide1

Pediatric1

Steady-state free precession2

Assessment6

Vessels2

Stress1

Incidence1

Pathology1