Systole. Medical search

Period of contraction of the HEART, especially of the HEART VENTRICLES.

Post-systolic relaxation of the HEART, especially the HEART VENTRICLES.

Contractile activity of the MYOCARDIUM.

The valve between the left atrium and left ventricle of the heart.

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.

The graphic recording of chest wall movement due to cardiac impulses.

Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.

A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.

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.

The hemodynamic and electrophysiological action of the HEART VENTRICLES.

The hollow, muscular organ that maintains the circulation of the blood.

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.

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.

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.

The hemodynamic and electrophysiological action of the LEFT ATRIUM.

Abnormal protrusion or billowing of one or both of the leaflets of MITRAL VALVE into the LEFT ATRIUM during SYSTOLE. This allows the backflow of blood into left atrium leading to MITRAL VALVE INSUFFICIENCY; SYSTOLIC MURMURS; or CARDIAC ARRHYTHMIA.

Timing the acquisition of imaging data to specific points in the cardiac cycle to minimize image blurring and other motion artifacts.

Echocardiography amplified by the addition of depth to the conventional two-dimensional ECHOCARDIOGRAPHY visualizing only the length and width of the heart. Three-dimensional ultrasound imaging was first described in 1961 but its application to echocardiography did not take place until 1974. (Mayo Clin Proc 1993;68:221-40)

Act of listening for sounds within the heart.

Backflow of blood from the LEFT VENTRICLE into the LEFT ATRIUM due to imperfect closure of the MITRAL VALVE. This can lead to mitral valve regurgitation.

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)

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.

The circulation of blood through the CORONARY VESSELS of the HEART.

The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.

Echocardiography applying the Doppler effect, with the superposition of flow information as colors on a gray scale in a real-time image.

The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of SYSTOLE and is heard as a "lubb" sound; the second is produced by the closing of the AORTIC VALVE and PULMONARY VALVE and is heard as a "dupp" sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the HEART ATRIA; and the fourth is produced by atrial contraction and ventricular filling.

The hemodynamic and electrophysiological action of the HEART ATRIA.

PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS.

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.

Echocardiography applying the Doppler effect, with velocity detection combined with range discrimination. Short bursts of ultrasound are transmitted at regular intervals and the echoes are demodulated as they return.

A twisting deformation of a solid body about an axis. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

The hemodynamic and electrophysiological action of the right HEART VENTRICLE.

The number of times the HEART VENTRICLES contract per unit of time, usually per minute.

The rhythmical expansion and contraction of an ARTERY produced by waves of pressure caused by the ejection of BLOOD from the left ventricle of the HEART as it contracts.

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.

This structure includes the thin muscular atrial septum between the two HEART ATRIA, and the thick muscular ventricular septum between the two HEART VENTRICLES.

A form of CARDIAC MUSCLE disease, characterized by left and/or right ventricular hypertrophy (HYPERTROPHY, LEFT VENTRICULAR; HYPERTROPHY, RIGHT VENTRICULAR), frequent asymmetrical involvement of the HEART SEPTUM, and normal or reduced left ventricular volume. Risk factors include HYPERTENSION; AORTIC STENOSIS; and gene MUTATION; (FAMILIAL HYPERTROPHIC CARDIOMYOPATHY).

A malformation that is characterized by a muscle bridge over a segment of the CORONARY ARTERIES. Systolic contractions of the muscle bridge can lead to narrowing of coronary artery; coronary compression; MYOCARDIAL ISCHEMIA; MYOCARDIAL INFARCTION; and SUDDEN CARDIAC DEATH.

The valve consisting of three cusps situated between the right atrium and right ventricle of the heart.

The chambers of the heart, to which the BLOOD returns from the circulation.

A fetal blood vessel connecting the pulmonary artery with the descending aorta.

Procedures in which placement of CARDIAC CATHETERS is performed for therapeutic or diagnostic procedures.

Rhythmic, intermittent propagation of a fluid through a BLOOD VESSEL or piping system, in contrast to constant, smooth propagation, which produces laminar flow.

Heart sounds caused by vibrations resulting from the flow of blood through the heart. Heart murmurs can be examined by HEART AUSCULTATION, and analyzed by their intensity (6 grades), duration, timing (systolic, diastolic, or continuous), location, transmission, and quality (musical, vibratory, blowing, etc).

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.

Resistance and recovery from distortion of shape.

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.

Motion pictures of the passage of contrast medium through blood vessels.

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.

The valve between the left ventricle and the ascending aorta which prevents backflow into the left ventricle.

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.

Examinations used to diagnose and treat heart conditions.

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).

A purely physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion; expressed quantitatively in units of force per unit area.

A vasodilator that is administered by inhalation. It is also used recreationally due to its supposed ability to induce euphoria and act as an aphrodisiac.

A technique of inputting two-dimensional images into a computer and then enhancing or analyzing the imagery into a form that is more useful to the human observer.

The flow of BLOOD through or around an organ or region of the body.

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.

Conical muscular projections from the walls of the cardiac ventricles, attached to the cusps of the atrioventricular valves by the chordae tendineae.

Changes in the observed frequency of waves (as sound, light, or radio waves) due to the relative motion of source and observer. The effect was named for the 19th century Austrian physicist Johann Christian Doppler.

Elements of limited time intervals, contributing to particular results or situations.

The failure by the observer to measure or identify a phenomenon accurately, which results in an error. Sources for this may be due to the observer's missing an abnormality, or to faulty technique resulting in incorrect test measurement, or to misinterpretation of the data. Two varieties are inter-observer variation (the amount observers vary from one another when reporting on the same material) and intra-observer variation (the amount one observer varies between observations when reporting more than once on the same material).

A type of imaging technique used primarily in the field of cardiology. By coordinating the fast gradient-echo MRI sequence with retrospective ECG-gating, numerous short time frames evenly spaced in the cardiac cycle are produced. These images are laced together in a cinematic display so that wall motion of the ventricles, valve motion, and blood flow patterns in the heart and great vessels can be visualized.

The circulation of the BLOOD through the LUNGS.

Pathological conditions involving the HEART including its structural and functional abnormalities.

Backflow of blood from the RIGHT VENTRICLE into the RIGHT ATRIUM due to imperfect closure of the TRICUSPID VALVE.

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.

The veins and arteries of the HEART.

The innermost layer of the heart, comprised of endothelial cells.

The range or frequency distribution of a measurement in a population (of organisms, organs or things) that has not been selected for the presence of disease or abnormality.

A pathological constriction that can occur above (supravalvular stenosis), below (subvalvular stenosis), or at the AORTIC VALVE. It is characterized by restricted outflow from the LEFT VENTRICLE into the AORTA.

Non-invasive imaging methods based on the mechanical response of an object to a vibrational or impulsive force. It is used for determining the viscoelastic properties of tissue, and thereby differentiating soft from hard inclusions in tissue such as microcalcifications, and some cancer lesions. Most techniques use ultrasound to create the images - eliciting the response with an ultrasonic radiation force and/or recording displacements of the tissue by Doppler ultrasonography.

Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues using a transducer placed in the esophagus.

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.

Regulation of the rate of contraction of the heart muscles by an artificial pacemaker.

Ultrasonography applying the Doppler effect, with frequency-shifted ultrasound reflections produced by moving targets (usually red blood cells) in the bloodstream along the ultrasound axis in direct proportion to the velocity of movement of the targets, to determine both direction and velocity of blood flow. (Stedman, 25th ed)

The study of the deformation and flow of matter, usually liquids or fluids, and of the plastic flow of solids. The concept covers consistency, dilatancy, liquefaction, resistance to flow, shearing, thixotrophy, and VISCOSITY.

The main trunk of the systemic arteries.

A technique for assisting the circulation by decreasing the afterload of the left ventricle and augmenting the diastolic pressure. It may be achieved by intra-aortic balloon, or by implanting a special pumping device in the chest, or externally by applying a negative pressure to the lower extremities during cardiac systole.

Narrowing of the passage through the MITRAL VALVE due to FIBROSIS, and CALCINOSIS in the leaflets and chordal areas. This elevates the left atrial pressure which, in turn, raises pulmonary venous and capillary pressure leading to bouts of DYSPNEA and TACHYCARDIA during physical exertion. RHEUMATIC FEVER is its primary cause.

The short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.

The process of generating three-dimensional images by electronic, photographic, or other methods. For example, three-dimensional images can be generated by assembling multiple tomographic images with the aid of a computer, while photographic 3-D images (HOLOGRAPHY) can be made by exposing film to the interference pattern created when two laser light sources shine on an object.

A type of heart valve surgery that involves the repair, replacement, or reconstruction of the annulus of the MITRAL VALVE. It includes shortening the circumference of the annulus to improve valve closing capacity and reinforcing the annulus as a step in more complex valve repairs.

A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Any of the ruminant mammals with curved horns in the genus Ovis, family Bovidae. They possess lachrymal grooves and interdigital glands, which are absent in GOATS.

Methods developed to aid in the interpretation of ultrasound, radiographic images, etc., for diagnosis of disease.

A device that substitutes for a heart valve. It may be composed of biological material (BIOPROSTHESIS) and/or synthetic material.

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.

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.

Three-dimensional representation to show anatomic structures. Models may be used in place of intact animals or organisms for teaching, practice, and study.

The veins that return the oxygenated blood from the lungs to the left atrium of the heart.

A combination of congenital heart defects consisting of four key features including VENTRICULAR SEPTAL DEFECTS; PULMONARY STENOSIS; RIGHT VENTRICULAR HYPERTROPHY; and a dextro-positioned AORTA. In this condition, blood from both ventricles (oxygen-rich and oxygen-poor) is pumped into the body often causing CYANOSIS.

Volume of circulating BLOOD. It is the sum of the PLASMA VOLUME and ERYTHROCYTE VOLUME.

A device designed to stimulate, by electric impulses, contraction of the heart muscles. It may be temporary (external) or permanent (internal or internal-external).

The visualization of tissues during pregnancy through recording of the echoes of ultrasonic waves directed into the body. The procedure may be applied with reference to the mother or the fetus and with reference to organs or the detection of maternal or fetal disease.

The properties, processes, and behavior of biological systems under the action of mechanical forces.

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.

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).

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.

Improvement of the quality of a picture by various techniques, including computer processing, digital filtering, echocardiographic techniques, light and ultrastructural MICROSCOPY, fluorescence spectrometry and microscopy, scintigraphy, and in vitro image processing at the molecular level.

Computer-assisted processing of electric, ultrasonic, or electronic signals to interpret function and activity.

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.

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.

Pathological condition characterized by the backflow of blood from the ASCENDING AORTA back into the LEFT VENTRICLE, leading to regurgitation. It is caused by diseases of the AORTIC VALVE or its surrounding tissue (aortic root).

Treatment process involving the injection of fluid into an organ or tissue.

A computer based method of simulating or analyzing the behavior of structures or components.

The vessels carrying blood away from the heart.

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.

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.

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.

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).

Studies to determine the advantages or disadvantages, practicability, or capability of accomplishing a projected plan, study, or project.

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)

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.

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.

Substances used to allow enhanced visualization of tissues.

In screening and diagnostic tests, the probability that a person with a positive test is a true positive (i.e., has the disease), is referred to as the predictive value of a positive test; whereas, the predictive value of a negative test is the probability that the person with a negative test does not have the disease. Predictive value is related to the sensitivity and specificity of the test.

The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.

The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated as the time from the last day of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization.

Narrowing or constriction of a coronary artery.

Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.

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).

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.

A procedure consisting of a sequence of algebraic formulas and/or logical steps to calculate or determine a given task.

Striated muscle cells found in the heart. They are derived from cardiac myoblasts (MYOBLASTS, CARDIAC).

Radiography of the vascular system of the heart muscle after injection of a contrast medium.

Any of various animals that constitute the family Suidae and comprise stout-bodied, short-legged omnivorous mammals with thick skin, usually covered with coarse bristles, a rather long mobile snout, and small tail. Included are the genera Babyrousa, Phacochoerus (wart hogs), and Sus, the latter containing the domestic pig (see SUS SCROFA).

The gradual irreversible changes in structure and function of an organism that occur as a result of the passage of time.

NECROSIS of the MYOCARDIUM caused by an obstruction of the blood supply to the heart (CORONARY CIRCULATION).

Statistical models in which the value of a parameter for a given value of a factor is assumed to be equal to a + bx, where a and b are constants. The models predict a linear regression.

Computer-based representation of physical systems and phenomena such as chemical processes.

Non-invasive method of vascular imaging and determination of internal anatomy without injection of contrast media or radiation exposure. The technique is used especially in CEREBRAL ANGIOGRAPHY as well as for studies of other vascular structures.

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.

Either of the two principal arteries on both sides of the neck that supply blood to the head and neck; each divides into two branches, the internal carotid artery and the external carotid artery.

The measurement of an organ in volume, mass, or heaviness.

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.

The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.

A statistical technique that isolates and assesses the contributions of categorical independent variables to variation in the mean of a continuous dependent variable.

Altered vascular reactivity following partial nephrectomy in the rat: a possible mechanism of the blood-pressure-lowering effect of heparin. (1/3311)

BACKGROUND: This study was designed to assess whether the antihypertensive effect of heparin in rats after renal mass reduction (RMR) is related to changes in nitric oxide activity, and to study in vitro the altered behaviour of resistance-sized arteries induced by chronic administration of heparin. METHODS: Male Wistar rats were assigned to one of two experimental protocols. In the first protocol, RMR rats received heparin (250 units/day s.c.) and tail systolic blood pressure (SBP) was measured weekly for 4 weeks. In a subgroup, urinary nitrate excretion (UNO3) and in vitro vascular reactivity of isolated perfused mesenteric arterial beds were measured 2 weeks after RMR. The second protocol assessed whether inhibition of NO synthesis with L-NAME (70 mg/l added to the drinking water) prevents the blood-pressure-lowering effect of heparin. RESULTS: In untreated RMR rats SBP increased from 111+/-3 mmHg to 127+/-5 mmHg at 2 weeks and 139+/-5 mmHg at 4 weeks. In contrast, in RMR rats treated with heparin, SBP was 114 +/-3 mmHg at 2 weeks and 115+/-4 mmHg at 4 weeks (P<0.05 for both). Treatment with L-NAME increased SBP both in untreated and heparin-treated RMR groups. Two weeks after nephrectomy daily urinary nitrate increased significantly more in RMR rats treated with heparin than in untreated RMR rats (22+/-2 vs 14.2+/-2.3 micromol/day, P<0.05). In vitro studies performed at 2 weeks showed that vessels of untreated RMR rats had a blunted vasodilator response to acetylcholine that was restored to levels similar to that of controls in the heparin-treated group. CONCLUSIONS: These results suggest that, in rats after renal ablation, heparin may exert its antihypertensive effect, at least in part, by affecting the altered behaviour of resistance vessels during the development phase of hypertension. Increased NO production may contribute to this effect. (+info)

Ambulatory blood pressure monitoring and progression in patients with IgA nephropathy. (2/3311)

BACKGROUND: Hypertension is a recognized marker of poor prognosis in IgA nephropathy. METHODS: The present study investigated the prevalence of white-coat hypertension, the diurnal rhythm of blood pressure (BP), the effectiveness of antihypertensive drug therapy, and the effect of the above on the progression of the kidney disease in IgA nephropathy. One hundred twenty-six IgA nephropathy patients were selected consecutively for 24-h ambulatory blood pressure monitoring (ABPM). Fifty-five patients were normotensive and 71 were treated hypertensives. Their antihypertensive drugs were angiotensin-converting enzyme inhibitors (ACEI) alone or in combination with calcium-channel blockers (CCB). RESULTS: The mean night-time BP of normotensives (108+/-9/67+/-6 mmHg) was significantly lower than their day-time BP (125+/-8/82+/-7 mmHg, P<0.05). There was no significant difference between the mean day-time and night-time BP in hypertensive patients (125+/-9/82+/-7 mmHg vs 128+/-10/85+/-9 mmHg). The circadian variation of BP was preserved ('dippers') in 82% of the normotensive and 7% of the hypertensive patients (P<0.001). There were 10 'white-coat hypertensives' among the patients classified as normotensives with ABPM (mean office blood pressure 149+/-7/96+/-8 mmHg, 24-h blood pressure 127+/-6/83+/-5 mmHg, P<0.05) and 14 among treated hypertensives (mean office BP 152+/-8/98+/-6 mmHg, 24-h BP 130+/-4/85+/-8 mmHg, P<0.05). There was no difference in mean day-time BP among normotensive and treated hypertensive patients (125+/-8/81+/-5 mmHg vs 128+/-10/85+/-9 mmHg). Hypertensives had significantly higher night-time BP (125+/-9/85+/-9 mmHg) than normotensives (108+/-9/67+/-6 mmHg, P<0.001). There was no difference in serum creatinine levels among the different groups at the time of the ABPM. However, thirty-six+/-4.1 months after the ABPM, hypertensive patients (n=52) had higher serum creatinine levels (124+/-32 micromol/l) than at the time of the ABPM (101+/-28 micromol/l). The serum creatinine of normotensive patients (n=43) did not change during the follow-up period. 'Non-dipper' normotensives (n=10) had significantly higher serum creatinine levels at the end of the follow-up period than at its beginning (106+/-17 micromol/l vs 89+/-18 micromol/l, P<0.05). There was no increase in serum creatinine of 'dipper' normotensives. The mean serum creatinine of 'white-coat hypertensives' was significantly higher at the end of the study period than at its beginning. CONCLUSIONS: There is no diurnal blood pressure variation in most of the hypertensive IgA nephropathy patients. ACEI and CCB treatment have better effect on day-time than night-time hypertension. The lack of the circadian rhythm and 'white-coat hypertension' seems to accelerate the progression of IgA nephropathy. (+info)

Effects of calcium-channel blockade in older patients with diabetes and systolic hypertension. Systolic Hypertension in Europe Trial Investigators. (3/3311)

BACKGROUND: Recent reports suggest that calcium-channel blockers may be harmful in patients with diabetes and hypertension. We previously reported that antihypertensive treatment with the calcium-channel blocker nitrendipine reduced the risk of cardiovascular events. In this post hoc analysis, we compared the outcome of treatment with nitrendipine in diabetic and nondiabetic patients. METHODS: After stratification according to center, sex, and presence or absence of previous cardiovascular complications, 4695 patients (age, > or =60 years) with systolic blood pressure of 160 to 219 mm Hg and diastolic pressure below 95 mm Hg were randomly assigned to receive active treatment or placebo. Active treatment consisted of nitrendipine (10 to 40 mg per day) with the possible addition or substitution of enalapril (5 to 20 mg per day) or hydrochlorothiazide (12.5 to 25 mg per day) or both, titrated to reduce the systolic blood pressure by at least 20 mm Hg and to less than 150 mm Hg. In the control group, matching placebo tablets were administered similarly. RESULTS: At randomization, 492 patients (10.5 percent) had diabetes. After a median follow-up of two years, the systolic and diastolic blood pressures in the placebo and active-treatment groups differed by 8.6 and 3.9 mm Hg, respectively, among the diabetic patients. Among the 4203 patients without diabetes, systolic and diastolic pressures differed by 10.3 and 4.5 mm Hg, respectively, in the two groups. After adjustment for possible confounders, active treatment was found to have reduced overall mortality by 55 percent (from 45.1 deaths per 1000 patients to 26.4 deaths per 1000 patients), mortality from cardiovascular disease by 76 percent, all cardiovascular events combined by 69 percent, fatal and nonfatal strokes by 73 percent, and all cardiac events combined by 63 percent in the group of patients with diabetes. Among the nondiabetic patients, active treatment decreased all cardiovascular events combined by 26 percent and fatal and nonfatal strokes by 38 percent. In the group of patients receiving active treatment, reductions in overall mortality, mortality from cardiovascular disease, and all cardiovascular events were significantly larger among the diabetic patients than among the nondiabetic patients (P=0.04, P=0.02, and P=0.01, respectively). CONCLUSIONS: Nitrendipine-based antihypertensive therapy is particularly beneficial in older patients with diabetes and isolated systolic hypertension. Thus, our findings do not support the hypothesis that the use of long-acting calcium-channel blockers may be harmful in diabetic patients. (+info)

Restriction of placental and fetal growth in sheep alters fetal blood pressure responses to angiotensin II and captopril. (4/3311)

1. We have measured arterial blood pressure between 115 and 145 days gestation in normally grown fetal sheep (control group; n = 16) and in fetal sheep in which growth was restricted by experimental restriction of placental growth and development (PR group; n = 13). There was no significant difference in the mean gestational arterial blood pressure between the PR (42.7 +/- 2.6 mmHg) and control groups (37.7 +/- 2.3 mmHg). Mean arterial blood pressure and arterial PO2 were significantly correlated in control animals (r = 0.53, P < 0.05, n = 16), but not in the PR group. 2. There were no changes in mean arterial blood pressure in either the PR or control groups in response to captopril (7.5 microg captopril min-1; PR group n = 7, control group n = 6) between 115 and 125 days gestation. After 135 days gestation, there was a significant decrease (P < 0.05) in the fetal arterial blood pressure in the PR group but not in the control group during the captopril infusion (15 microg captopril min-1; PR group n = 7, control group n = 6). 3. There was a significant effect (F = 14.75; P < 0.001) of increasing doses of angiotensin II on fetal diastolic blood pressure in the PR and control groups. The effects of angiotensin II were different (F = 8.67; P < 0.05) in the PR and control groups at both gestational age ranges. 4. These data indicate that arterial blood pressure may be maintained by different mechanisms in growth restricted fetuses and normally grown counterparts and suggests a role for the fetal renin-angiotensin system in the maintenance of blood pressure in growth restricted fetuses. (+info)

The diameter of the common femoral artery in healthy human: influence of sex, age, and body size. (5/3311)

PURPOSE: To determine the relevance of dilatations of the common femoral artery (CFA), knowledge of the normal CFA diameter is essential. The diameter of the CFA in healthy male and female subjects of different ages was investigated. METHODS: The diameter of the CFA was measured in 122 healthy volunteers (59 male, 63 female; 8 to 81 years of age) with echo-tracking B-mode ultrasound scan. The influence of age, sex, height, weight, body surface area (BSA), and systolic blood pressure was analyzed by means of a multiple regression model. RESULTS: The CFA increased steadily in diameter throughout life. From 25 years onwards, the diameter was larger in men than in women. Significant correlations were found between the CFA diameter and weight (r = 0.58 and r = 0.57 in male and female subjects, respectively; P <.0001), height (r = 0.49 and r = 0.54 in male and female subjects, respectively; P <.0001), and BSA (r = 0.60 and r = 0.62 in male and female subjects, respectively; P <.0001). Age and BSA were used to create a model for prediction of the CFA diameter (r = 0.71 and r = 0.77 in male and female subjects, respectively; P <.0001). CONCLUSION: The diameter of the CFA increases with age, initially during growth but also in adults. This is related to age, body size, and sex male subjects have larger arteries than female subjects. It is now possible to predict the normal CFA diameter, and nomograms that may be used in the study of aneurysmal disease are presented. (+info)

Acute exercise can improve cardioprotection without increasing heat shock protein content. (6/3311)

The aim of this study was to determine the effects of acute bouts of exercise on myocardial recovery after ischemia and heat shock protein expression. Adult female Sprague-Dawley rats were divided into five groups: 1) 1-day run (1DR; n = 6) and 2) 3-day run (3DR; n = 7), in which rats ran for 100 min at a speed of 20 m/min up a 6 degrees grade for 1 or 3 consecutive days; 3) 1-day cold run (1CR), in which rats ran the same as 1DR but with wet fur at 8 degrees C, which prevented an elevation of core temperature (n = 8); 4) heat shock sedentary (HS), in which rats had their core temperatures raised to 42 degrees C one time for 15 min (n = 5); and 5) sedentary control (n=15). Cardiac function was analyzed 24 h after the last treatment using an isolated, working heart model. Nonpaced hearts were initially perfused under normoxic conditions, then underwent 17 min of global, normothermic (37 degrees C) ischemia, and, finally, were allowed to recover for 30 min under normoxic conditions. The concentration of the 72-kDa heat shock protein (HSP 72) was measured in each left ventricle. Compared with that in the sedentary group, recovery of cardiac output x systolic pressure (CO x SP) was enhanced (P < 0.05) in all treatment groups when the postischemic value was covaried with the preischemic value. No differences in CO x SP were found (P > 0.05) between the following groups: 1DR vs. 3DR, 1DR vs. HS, and 1DR vs. 1CR. Heat shock protein concentration was significantly greater (P < 0.05) than that in the sedentary controls in HS, 1DR, and 3DR groups, but not for 1CR. The concentration of HSP 72 was not significantly correlated with postischemic CO x SP (R2 = 0.197, P > 0.05). We conclude that acute bouts of exercise can produce cardioprotective effects without an elevation of HSP 72. (+info)

Echocardiography-derived left ventricular end-systolic regional wall stress and matrix remodeling after experimental myocardial infarction. (7/3311)

OBJECTIVES: We tested the hypothesis that regional end-systolic left ventricular (ESLV) wall stress is associated with extracellular matrix remodeling activity after myocardial infarction (MI). BACKGROUND: Increased left ventricular (LV) wall stress is a stimulus for LV enlargement, and echocardiography can be used to estimate regional wall stress. A powerful validation of a noninvasive method of estimating wall stress would be predicting cellular responses after a MI. METHODS: Echocardiographic images were obtained in rats 1, 7, 14 or 21 days after coronary ligation (n = 11) or sham surgery (n = 5). End-systolic left ventricular wall stress was calculated by finite element analysis in three regions (infarcted, noninfarcted and border) from short-axis images. Matrix metalloproteinase-9 (MMP-9) and macrophage density were determined by immunohistochemistry, and positive cells were counted in high power fields (hpf). RESULTS: Average ESLV wall stress was higher in rats with MI when compared to shams irrespective of time point (p < 0.01), and ESLV wall stress in the infarcted regions increased with time (25.1 +/- 5.9 vs. 69.9 +/- 4.4 kdyn/cm2, day 1 vs. 21; p < 0.01). Matrix metalloproteinase-9 expression was higher in infarcted and border regions when compared to noninfarcted regions (22.1 vs. 25.7 vs. 0.10 cells/hpf, respectively; p < 0.01). Over all regions, ESLV wall stress was associated with MMP-9 (r = 0.76; p < 0.001), macrophage density (r = 0.72; p < 0.001) and collagen content (r = 0.67; p < 0.001). End-systolic left ventricular wall stress was significantly higher when MMP-9 positive cell density was greater than 10 cells/hpf (45+/-20 vs. 14+/-10 kdyn/cm2; p < 0.001). CONCLUSIONS: Regional increases in ESLV wall stress determined by echocardiography-based structural analysis are associated with extracellular matrix degradation activity. (+info)

Chordal force distribution determines systolic mitral leaflet configuration and severity of functional mitral regurgitation. (8/3311)

OBJECTIVES: The purpose of this study was to investigate the impact of the chordae tendineae force distribution on systolic mitral leaflet geometry and mitral valve competence in vitro. BACKGROUND: Functional mitral regurgitation is caused by changes in several elements of the valve apparatus. Interaction among these have to comply with the chordal force distribution defined by the chordal coapting forces (F(c)) created by the transmitral pressure difference, which close the leaflets and the chordal tethering forces (FT) pulling the leaflets apart. METHODS: Porcine mitral valves (n = 5) were mounted in a left ventricular model where leading edge chordal forces measured by dedicated miniature force transducers were controlled by changing left ventricular pressure and papillary muscle position. Chordae geometry and occlusional leaflet area (OLA) needed to cover the leaflet orifice for a given leaflet configuration were determined by two-dimensional echo and reconstructed three-dimensionally. Occlusional leaflet area was used as expression for incomplete leaflet coaptation. Regurgitant fraction (RF) was measured with an electromagnetic flowmeter. RESULTS: Mixed procedure statistics revealed a linear correlation between the sum of the chordal net forces, sigma[Fc - FT]S, and OLA with regression coefficient (minimum - maximum) beta = -115 to -65 [mm2/N]; p < 0.001 and RF (beta = -0.06 to -0.01 [%/N]; p < 0.001). Increasing FT by papillary muscle malalignment restricted leaflet mobility, resulting in a tented leaflet configuration due to an apical and posterior shift of the coaptation line. Anterior leaflet coapting forces increased due to mitral leaflet remodeling, which generated a nonuniform regurgitant orifice area. CONCLUSIONS: Altered chordal force distribution caused functional mitral regurgitation based on tented leaflet configuration as observed clinically. (+info)

ISBN 3-540-11658-3 Berger, Marcel: Systoles et applications selon Gromov. (French) [Systoles and their applications according ... Berger, M.: What is... a Systole? Notices of the AMS 55 (2008), no. 3, 374-376. online text Berger, Marcel (2003). A Panoramic ...

https://en.wikipedia.org/wiki/Marcel_Berger

Berger, M.: Systoles et applications selon Gromov. (French. French summary) [Systoles and their applications according to ... More details appear at systoles of surfaces. The deepest result in the field is Gromov's inequality for the homotopy 1-systole ... The systole of a compact metric space X is a metric invariant of X, defined to be the least length of a noncontractible loop in ... The actual term "systole" itself was not coined until a quarter century later, by Marcel Berger. This line of research was, ...

https://en.wikipedia.org/wiki/Systolic_geometry

ISBN 0-8176-3898-9 Berger, M.: What is... a Systole? Notices of the AMS 55 (2008), no. 3, 374-376. Katz & Katz (2010). Stewart ... a Systole?" lists the book (Katz, 2007) as one of two books he cites in systolic geometry. More recently Katz also contributed ...

https://en.wikipedia.org/wiki/Mikhail_Katz

Berger, M.: Systoles et applications selon Gromov. (French. French summary) [Systoles and their applications according to ... In geometry, a systole is a distance which is characteristic of a compact metric space which is not simply connected. It is the ... The actual term systole itself was not coined until a quarter century later, by Marcel Berger. This line of research was, ... Berger, M.: What is... a Systole? Notices of the AMS 55 (2008), no. 3, 374-376. Buser, P.; Sarnak, P.: On the period matrix of ...

https://en.wikipedia.org/wiki/Introduction_to_systolic_geometry

Volumetric definition of the heart in systole was first described by Adolph Fick as cardiac output. Fick may be readily and ... During diastole, the ventricular pressure falls from the peak reached at the end of systole. When this pressure falls below the ... This is termed partial persistent systole. Ischemia may manifest in distinct ways, either as a result of increasing tissue ... Mathematics describing the relationship between the ratio of Systole to Diastole in accepted terms of End Systolic Volume to ...

https://en.wikipedia.org/wiki/Heart_failure_with_preserved_ejection_fraction

Systole, least length of a noncontractible loop. Tangent bundle, the vector bundle of tangent spaces on a differentiable ...

https://en.wikipedia.org/wiki/Glossary_of_differential_geometry_and_topology

This beginning of the atrial systole is known as the atrial kick-see Wiggers diagram. The atrial kick does not supply the ... That is, for a typical heart rate of 75 beats per minute (bpm), the cycle requires 0.3 sec in ventricular systole (contraction ... Systole (medicine) Blood pressure Wiggers diagram Diastole. Merriam-Webster Online Dictionary. 24 August 2008. Widmaier, Eric P ... In summary, when the ventricles are in systole and contracting, the atria are relaxed and collecting returning blood. When, in ...

https://en.wikipedia.org/wiki/Diastole

Systole [1] Ghettoblaster Magazine, June 24, 2015. [2] MusicBox Pete June 29, 2015 "Hawking Introduces Us To Math Pop". Baeble ...

https://en.wikipedia.org/wiki/Hawking_(band)

Katz, Mikhail G.; Schaps, Mary; Vishne, Uzi (2007), "Logarithmic growth of systole of arithmetic Riemann surfaces along ... and Vishne to construct a family of Hurwitz surfaces satisfying an asymptotic lower bound for the systole: s y s > 4 3 log ⁡ g ... see systoles of surfaces. (2,3,7) triangle group Klein quartic Macbeath surface First Hurwitz triplet Vogeler, Roger (2003), On ...

https://en.wikipedia.org/wiki/Hurwitz_quaternion_order

Note how the right atrial collapses during systole. Play media Ultrasound image of the inferior vena cava (IVC) in a person ...

https://en.wikipedia.org/wiki/Cardiac_tamponade

This complex mechanism illustrates systole of the heart. Cardiac muscle cells, unlike most other tissues in the body, rely on ...

https://en.wikipedia.org/wiki/Muscle_tissue

Ventricular systole Cardiac diastole ECG The EKG complex. P=P wave, PR=PR interval, QRS=QRS complex, QT=QT interval, ST=ST ...

https://en.wikipedia.org/wiki/Wiggers_diagram

The increased workload may also be associated with a higher heart rate, a proportionately longer duration of systole and a ... This increases the load on the heart in systole. John R. Cockcroft, notable researcher on the subject Pulse wave velocity ... is increased in stiffer arteries and consequently reflected waves will arrive at the heart earlier in systole. ...

https://en.wikipedia.org/wiki/Arterial_stiffness

Volume 1. Chisholm 1911, p. 397 harvnb error: no target: CITEREFChisholm1911 (help). "CITOLE, also spelled Systole, Cythole, ...

https://en.wikipedia.org/wiki/History_of_lute-family_instruments

During most of the cardiac cycle, ventricular pressure is less than the pressure in the aorta, but during systole, the ... Fractional shortening (FS) is the fraction of any diastolic dimension that is lost in systole. When referring to endocardial ... During systole, the ventricles contract, pumping blood through the body. During diastole, the ventricles relax and fill with ...

https://en.wikipedia.org/wiki/Ventricle_(heart)

Occurs during systole or continuously during both systole and diastole. (Murmurs occurring only during diastole are usually ...

https://en.wikipedia.org/wiki/Functional_murmur

Volume 1. "CITOLE, also spelled Systole, Cythole, Gytolle, &c. (probably a Fr. diminutive form of cithara, and not from Lat. ...

https://en.wikipedia.org/wiki/Citole

These two phases are commonly understood as systole and diastole. The rest phase is considered polarized. The resting potential ...

https://en.wikipedia.org/wiki/Cardiac_muscle_cell

Cardiac systole and diastole. During each heartbeat, blood pressure varies between a maximum (systolic) and a minimum ( ...

https://en.wikipedia.org/wiki/Arterial_blood_pressure

Supraventricular extra systole (SVES). Two PACs as seen on a rhythm strip. ...

https://en.wikipedia.org/wiki/Skipped_beat

Vesalius believed that cardiac systole is synchronous with the arterial pulse. He not only verified Estienne's findings on the ...

https://en.wikipedia.org/wiki/Andreas_Vesalius

doi:10.1016/0022-314x(82)90028-2. Katz, M.; Schaps, M.; Vishne, U. (2007). "Logarithmic growth of systole of arithmetic Riemann ...

https://en.wikipedia.org/wiki/Arithmetic_Fuchsian_group

Its duration is, as the name suggests, the whole of systole. The loudness of the murmur does not correlate well with the ... will reveal a jet of blood flowing from the left ventricle into the left atrium during ventricular systole. Also, it may detect ... and comparing it with the flow out of the left ventricle through the aortic valve in ventricular systole. This method assumes ...

https://en.wikipedia.org/wiki/Mitral_insufficiency

Logarithmic growth of systole of arithmetic Riemann surfaces along congruence subgroups. J. Differential Geom. 76 (2007), no. 3 ...

https://en.wikipedia.org/wiki/Uzi_Vishne

"Volume catheter parallel conductance varies between end-systole and end-diastole". IEEE Trans Biomed Eng. 54 (8): 1480-9. doi: ...

https://en.wikipedia.org/wiki/Admittance_and_conductance_in_cardiac_performance

When ventricular systole ends, pressure in the left ventricle rapidly drops. When the pressure in the left ventricle decreases ... When the left ventricle contracts (systole), pressure rises in the left ventricle. When the pressure in the left ventricle ...

https://en.wikipedia.org/wiki/Aortic_valve

ISBN 978-3-540-69113-6. Katz, M.; Schaps, M.; Vishne, U. (2007). "Logarithmic growth of systole of arithmetic Riemann surfaces ... as well as systoles of Fuchsian subgroups) can be calculated by means of the reduced trace in the quaternion algebra, and the ...

https://en.wikipedia.org/wiki/(2,3,7)_triangle_group

P I = v s y s t o l e − v d i a s t o l e v m e a n {\displaystyle PI={\frac {v_{systole}-v_{diastole}}{v_{mean}}}} Resistance ... Blood velocities in arteries are higher during systole than during diastole. One parameter to quantify this difference is the ...

https://en.wikipedia.org/wiki/Hemodynamics

Myofibrils are mostly arranged circularly and constrict the heart during systole. There are two valves present, an anterior ...

https://en.wikipedia.org/wiki/Opiliones_anatomy

Katz, M.; Schaps, M.; Vishne, U. (2007). "Logarithmic growth of systole of arithmetic Riemann surfaces along congruence ... The systolic ratio is the ratio of the square of the systole to the area. (2,3,7) triangle group Elkies, N. (1999). The Klein ... The lower bound on the systole as specified in [2], namely 4 3 log ⁡ ( g ( Σ ) ) , {\displaystyle {\frac {4}{3}}\log(g(\Sigma ...

https://en.wikipedia.org/wiki/First_Hurwitz_triplet

systole: Period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the ... In an ECG, atrial systole is associated with atrial depolarization, or the P wave deflection. "Systole" may also refer to the ... Systole causes the ejection of blood into the aorta and pulmonary trunk. Lasting usually 0.3 to 0.4 second, ventricular systole ... Systole, period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the ...

https://www.britannica.com/science/systole-heart-function

Systo*le (?), n. [NL., fr. Gr. &?;, fr. &?; to contract; sy`n with + &?; to set, place.] 1. (Gram.) The shortening of ...

https://everything2.com/title/systole

Create healthcare diagrams like this example called Atrial Systole in minutes with SmartDraw. SmartDraw includes 1000s of ... Atrial Systole. Create healthcare diagrams like this example called Atrial Systole in minutes with SmartDraw. SmartDraw ... Atrial Systole. Changes in heart structure during atrial systole.. LifeART Collection Images Copyright © 1989-2001 by ...

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Systole definition is - a rhythmically recurrent contraction; especially : the contraction of the heart by which the blood is ... Examples of systole in a Sentence. Recent Examples on the Web The researchers found that during systole, people tended to ... Post the Definition of systole to Facebook Share the Definition of systole on Twitter ... History and Etymology for systole. Greek systolē, from systellein to contract, from syn- + stellein to send ...

https://www.merriam-webster.com/dictionary/systole

Here, we discuss the difference between diastole and systole and the risks of hypertension (high) and hypotension (low) blood ... What are diastole and systole?. Diastole is when the heart muscle relaxes and systole is when the heart muscle contracts. ... The terms diastole and systole refer to when the heart muscles relax and contract. The balance between diastole and systole ... Systole is when the heart muscle contracts.. *When the heart contracts, it pushes the blood out of the heart and into the large ...

https://www.medicalnewstoday.com/articles/321447.php

Atrial systole lasts approximately 100 ms and ends prior to ventricular systole, as the atrial muscle returns to diastole. The ... LV systole is volumetrically defined as the left ventricular ejection fraction (LVEF). Similarly, RV systole is defined as the ... left atrial systole is ended and ventricular systole is about to begin. The time variable for the left systolic cycle is ... The systole (/ˈsɪstəli/ SIST-ə-lee) is the part of the cardiac cycle during which some chambers of the heart muscle contract ...

https://en.wikipedia.org/wiki/Systole

Premature systole definition at Dictionary.com, a free online dictionary with pronunciation, synonyms and translation. Look it ...

https://www.dictionary.com/browse/premature-systole

Systole may refer to: Systole (medicine), a term describing the contraction of the heart Systolic array, a term used in ... surfaces Also see Introduction to systolic geometry This disambiguation page lists articles associated with the title Systole. ... computer architecture Systolic geometry, a term used in mathematics In mathematics, Systoles of surfaces are systolic ...

https://en.wikipedia.org/wiki/Systole_(disambiguation)

Systole is the last stage of a heart beat. It happens right after diastole, when the heart refills with blood. During systole, ... During systole, the heart muscle gets an automatic electrical signal that tells the heart to contract (squeeze). This makes the ... Blood causes the most pressure against the walls of the arteries when it is being pushed out during systole). The lowest ... "Systole definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms". Medterms.com. ...

https://simple.wikipedia.org/wiki/Systole

... on WN Network delivers the latest Videos and Editable pages for News & Events, including Entertainment, Music, Sports, ... Systole. Systole /ˈsɪstəliː/ is the part of the cardiac cycle when the ventricles contract. The term "systole" originates from ... Systole. Systole /ˈsɪstəliː/ is the part of the cardiac cycle when the ventricles contract. The term "systole" originates from ... The notion of systole. The systole of a compact metric space X is a metric invariant of X, defined to be the least length of a ...

https://wn.com/Systole

... for left ventricular strain measurement during the systole using cine-gated... ... The Hyperelastic Warping solution was evolved using a series of non-tagged images in 10 phases from end-diastole to end-systole ... Strain Measurement in the Left Ventricle During Systole with Deformable Image Registration. ... Strain Measurement in the Left Ventricle During Systole with Deformable Image Registration. In: Sachse F.B., Seemann G. (eds) ...

https://link.springer.com/chapter/10.1007%2F978-3-540-72907-5_4

Gene context of Systole. *LV wall thickness during systole and % fractional shortening were diminished by 8-10% in Cx43- ... Energy levels at systole vs. diastole in normal hamster hearts vs. myopathic hamster hearts. Sievers, R., Parmley, W.W., James ... Atrial systole and left ventricular filling in hypertrophic cardiomyopathy: effect of verapamil. Bonow, R.O., Frederick, T.M., ... Effect of increased adrenergic activity on the relationship between electrical and mechanical systole. Boudoulas, H., Geleris, ...

https://www.wikigenes.org/e/mesh/e/8636.html

We provide competent support to help you find the right specialist - free of charge, confidentially and with the highest medical quality. This is what the Leading Medicine Guide stands for with its strict admission criteria.. ...

https://www.leading-medicine-guide.com/en/anatomy/systole

Synonyms for systole and diastole at Thesaurus.com with free online thesaurus, antonyms, and definitions. Dictionary and Word ...

http://www.thesaurus.com/browse/systole+and+diastole

systole answers are found in the Tabers Medical Dictionary powered by Unbound Medicine. Available for iPhone, iPad, Android, ... In the cardiac cycle, atrial systole precedes ventricular systole, which pumps blood into the aorta and pulmonary artery. ... In the cardiac cycle, atrial systole precedes ventricular systole, which pumps blood into the aorta and pulmonary artery. ... systole is a topic covered in the Tabers Medical Dictionary. To view the entire topic, please sign in or purchase a ...

https://www.tabers.com/tabersonline/view/Tabers-Dictionary/766199/all/systole

... during systole: a numerical study A. Redaelli, F. Inzoli, R. Pietrabissa & P.M.... ... Evaluation of intraventricular pressure gradients during systole: a numerical study A. Redaelli, F. Inzoli, R. Pietrabissa & P. ... Experimental evidences by Pasiparidopulos have pointed out that during early systole the intraventricular pressure drop (IPD ... The impulsive nature of the blood flow during systole suggests that the intraventricular pressure gradient (IPG), needed to ...

https://www.witpress.com/elibrary/wit-transactions-on-biomedicine-and-health/2/9889

syrinx and systole is a book of prose poems and lyrical poems which meditate, with a Buddhist orientation, on philosophical and ...

https://quattrobooks.ca/books/syrinx-and-systole/

... atrial systole explanation free. What is atrial systole? Meaning of atrial systole medical term. What does atrial systole mean? ... Looking for online definition of atrial systole in the Medical Dictionary? ... Related to atrial systole: atrial diastole, Ventricular systole systole. [sis´to-le] the contraction, or period of contraction ... extra systole see extrasystole.. ventricular systole contraction of the ventricles, forcing blood into the aorta and pulmonary ...

https://medical-dictionary.thefreedictionary.com/Atrial+systole

Exercise and physical activity help lower blood pressure by helping you lose weight and keep your heart and blood vessels in good shape. Weight loss achieved through diet and exercise helps to control factors such as glycemia and other complications of obesity. Avoiding these complications helps to lower blood pressure and prevent high blood pressure. Consult your doctor before starting a new exercise program.. * The NHS advises people to undertake 2 ½ hours of moderate physical activity each week or 1 hour and 15 minutes of vigorous exercise. If you are not yet very active, the British Heart Foundation recommends building your exercise level from a few 10-minute sessions each day. Overconsumption of alcohol over a long period has been found to contribute to higher levels of blood pressure. It can be easy for us not to know when we drink too much.. * Tip Frozen unsweetened peach slices are an excellent alternative to fresh peaches and nectarines in case of high blood pressure. Simply defrost in ...

http://blood-pressure-diet.com/systole-jantung/

Examples of a serving include a medium fruit, 1/2 cup of fresh, frozen or canned fruit, or 4 ounces of juice. Milk, yogurt, cheese and other dairy products are major sources of calcium, vitamin D and protein. But the key is to make sure that you choose low-fat or fat-free dairy products because otherwise they can be a major source of fat - and most are saturated. Examples of a serving include 1 cup of creamed milk or 1 percent of milk, 1 cup of milkow fatty yogurt, or 1 1/2 ounces of partially creamed cheese.. * With the exception of olive oil, coconut oil and sesame, I generally try to stay away from vehement oils tales. However, sesame seed oil has been popular in ancient medicines for millennia and possesses serious heart properties. Seed oil lowers blood pressure and helps protect against cardiac hypertrophy, a thickening of the heart muscle usually caused by high blood pressure. Much research is focused on the ability of sesame oil to increase potassium levels while decreasing sodium in the ...

http://blood-pressure-diet.com/systole-generale/

... ...

https://insights.ovid.com/pedre/199803000/00006450-199803000-00004

Here we perform 3D tractography of the human heart \(in\) \(vivo\) at both end diastole and end systole. We show that fiber ... Diffusion MRI tractography of the human heart \(in\) \(vivo\) at end-diastole and end-systole. Journal of Cardiovascular ... Diffusion MRI Tractography of the Human Heart \(In\) \(Vivo\) at End-Diastole and End-Systole. ... decrease during systole. Our data suggest that myocardial fiber architecture is dynamic and is a function of both chamber ...

https://dash.harvard.edu/handle/1/9393005

end-systole/systolic. ES-GLS. end-systolic global longitudinal strain. ES-SLS. end-systolic segmental longitudinal strain. ICC ... How to Define End-Diastole and End-Systole? Message Subject (Your Name) has forwarded a page to you from JACC: Cardiovascular ... Surrogate Parameters Used to Define End-Systole. (A) Mean error (considering the sign) ± SD; (B) mean absolute error (without ... 2009) A novel echocardiographic marker of end systole in the ischemic left ventricle: "tug of war" sign. Am J Physiol Heart ...

http://imaging.onlinejacc.org/content/8/2/148

Left ventricular long axis function in diastolic heart failure is reduced in both diastole and systole: time for a redefinition ... Left ventricular long axis function in diastolic heart failure is reduced in both diastole and systole: time for a redefinition ...

https://heart.bmj.com/content/87/2/121.responses

Importance of Atrial Systole to Ventricular Filling Predicted by Transesophageal Echocardiography Steven N. Konstadt, M.D.; ... Importance of Atrial Systole to Ventricular Filling Predicted by Transesophageal Echocardiography You will receive an email ... Importance of Atrial Systole to Ventricular Filling Predicted by Transesophageal Echocardiography. Anesthesiology 6 1990, Vol. ... Steven N. Konstadt, David L. Reich, Daniel M. Thys, Zaharia Hillel, Eric Louie; Importance of Atrial Systole to Ventricular ...

http://anesthesiology.pubs.asahq.org/article.aspx?articleid=1952669

Methods Thirty-five patients underwent 3D-perfusion CMR with data acquired at both end-systole and mid-diastole. MBF and ... Estimates of MBF are significantly different for systole and diastole at stress but diagnostic accuracy to detect CAD is high ... Methods Thirty-five patients underwent 3D-perfusion CMR with data acquired at both end-systole and mid-diastole. MBF and ... Estimates of MBF are significantly different for systole and diastole at stress but diagnostic accuracy to detect CAD is high ...

https://www.zora.uzh.ch/id/eprint/98661/

Distribution of normal human left ventricular myofiber stress at end diastole and end systole: a target for in silico design of ... Download PDF Distribution of normal human left ventricular myofiber stress at end diastole and end systole: a target for in ... Distribution of normal human left ventricular myofiber stress at end diastole and end systole: a target for in silico design of ...

https://www.zora.uzh.ch/id/eprint/98658/

Atrial systole causes a substantial increase in myocardial segment length when the ventricle is on the sensitive part of its ... Left Ventricular Diastolic Pressure and Myocardial Segment Length and Observations on the Contribution of Atrial Systole. R. J ... Left Ventricular Diastolic Pressure and Myocardial Segment Length and Observations on the Contribution of Atrial Systole ... Left Ventricular Diastolic Pressure and Myocardial Segment Length and Observations on the Contribution of Atrial Systole ...

http://circres.ahajournals.org/content/8/5/1092

Define systole, diastole, and list the ranges of excellent,... ... List both the systole and. diastole. Define systole, diastole, ...

https://www.coursehero.com/tutors-problems/Health-Science/19607556-Take-your-blood-pressure-and-also-somebody-elses-List-both-the-systol/

5 parts with Representation of Systole - 3B Smart Anatomy , Human Heart Models , Invest in quality with this uniquely sectioned ... Life-Size Human Heart Model, 5 parts with Representation of Systole - 3B Smart Anatomy. 239.19 € ... It shows the cardiac valves during diastole and on the base the valves are shown in systole. A dissection through the median ... Life-Size Human Heart Model, 5 parts with Representation of Systole - 3B Smart Anatomy. ...

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Atrial systole occurs toward the end of ventricular diastole, completing the filling of the ventricles. (britannica.com)
In an ECG, atrial systole is associated with atrial depolarization, or the P wave deflection. (britannica.com)
Create healthcare diagrams like this example called Atrial Systole in minutes with SmartDraw. (smartdraw.com)
Changes in heart structure during atrial systole. (smartdraw.com)
Atrial systole occurs late in ventricular diastole and represents the contraction of myocardium of the left and right atria. (wikipedia.org)
Loss of normal electrical conduction in the heart-as seen during atrial fibrillation, atrial flutter, and complete heart block-may eliminate atrial systole completely. (wikipedia.org)
At the start of atrial systole, during ventricular diastole, the ventricles are normally filled to about 70 - 80 percent of capacity by inflow from the atria. (wikipedia.org)
Atrial systole lasts approximately 100 ms and ends prior to ventricular systole, as the atrial muscle returns to diastole. (wikipedia.org)
In the cardiac cycle, atrial systole precedes ventricular systole, which pumps blood into the aorta and pulmonary artery. (tabers.com)
The rate varies normally with the cardiac cycle, being fastest during atrial diastole and slowest during atrial systole. (thefreedictionary.com)
Atrial systole causes a substantial increase in myocardial segment length when the ventricle is on the sensitive part of its pressure-length curve. (ahajournals.org)
Atrial systole lasts about 0.1 seconds. (enacademic.com)
Subsequent physiologic discharge from the SA node then finds its way through the atrial mass, eventually meeting at the atrioventricular node to be gated through the available channels from the atria to the ventricles to allow ventricular systole or [LVEF] + [RVEF]. (piglix.com)
The atrial systole (0.1 sec) is included in the ventricular diastole, as it occurs at the end of this phase. (kypho.com)
The atrial diastole (0.7 sec) is not considered, as it overlaps ventricular systole and diastole. (kypho.com)
The end of diastole coincides with atrial systole. (kypho.com)
The atrial systole lasts for 0.1 sec. (kypho.com)
The atrial systole is not required for ventricular filling in normal heart rates. (kypho.com)
The rapid filling phase of ventricular filling, gives the III heart sound and the atrial systole produces IV heart sound. (kypho.com)
Systole can be divided into atrial systole in which the atria contract, and ventricular systole when the ventricles contract. (biologydictionary.net)
Atrial systole moves blood from the atria into the ventricles, while ventricular systole moves blood out of the heart into the pulmonary and systemic circulations. (biologydictionary.net)
Atrial systole starts just before this, caused by the destabilization of "P" on the electrocardiogram. (biologydictionary.net)
By the end of atrial systole , the impulse reaches the atrioventricular node, which is in the right atrium. (freethesaurus.com)
Part of the mass prolapsed through the mitral valve to the left ventricle during the atrial systole (Fig. (freethesaurus.com)
Absent ductus venosus atrial systole (a-wave), umbilical vein pulsations, loss of movement, and oligohydramnios were the strongest predictors of stillbirth and acidemia. (freethesaurus.com)
Atrial fibrillation is also associated with haemodynamic complications due to the generation of excessive exercise-induced tachycardia and the loss of synchronized atrial systole , which results in a reduction in cardiac output by up to 50% in octogenarians[4]. (freethesaurus.com)
LA maximum volume (Vmax) at the end-systolic phase, LA minimum volume (Vmin) at the end-diastolic phase and LA volume before atrial systole (Vp) were measured and calculated with adjustment to body surface area. (freethesaurus.com)
What Happens During Atrial Systole? (reference.com)
Subsequent physiologic discharge from the SA node then finds it way through the atrial mass, eventually meeting at the atrioventicular node to be gated through the available channels from the atria to the ventricles to allow ventricular systole or [LVEF] + [RVEF]. (gutenberg.org)
Atrial systole occurs late in ventricular diastole . (gutenberg.org)
Atrial fibrillation represents a common electrical malady apparent during the time interval of atrial systole. (gutenberg.org)
The cardiac cycle is divided into five phases, two of which imply a radical change of pressure in the heart: the diastole (or joint diastole) and the systole (or atrial systole). (pablocalderonsalazar.com)

Systole , period of contraction of the ventricles of the heart that occurs between the first and second heart sounds of the cardiac cycle (the sequence of events in a single heart beat). (britannica.com)
The systole (/ˈsɪstəli/ SIST-ə-lee) is the part of the cardiac cycle during which some chambers of the heart muscle contract after refilling with blood. (wikipedia.org)
Cardiac systole is the contraction of the cardiac muscle in response to an electrochemical stimulus to the heart's cells (cardiomyocytes). (wikipedia.org)
Systole / ˈ s ɪ s t əl iː / is the part of the cardiac cycle when the ventricles contract. (wn.com)
The frame after end-diastole (ED), marked by mitral valve closure (MVC), is often considered as the beginning of a new cardiac cycle, and aortic valve closure (AVC) is used to describe the end of systole (ES). (onlinejacc.org)
Estimates of MBF are significantly different for systole and diastole at stress but diagnostic accuracy to detect CAD is high for both cardiac phases. (uzh.ch)
It shows the cardiac valves during diastole and on the base the valves are shown in systole. (3bscientific.com)
After reconstruction, the ungated images were retrospectively binned ("self-gated") into two cardiac phases using a region of interest based technique and deformably registered into near-systole and near-diastole. (nih.gov)
Cardiac electrical systole is staged and first derived from sympathetic charge from the sinoatrial node (SA node). (piglix.com)
Systole is the phase of the cardiac cycle in which the heart muscles are contracted. (biologydictionary.net)
The following diagram shows systole in the context of the entire cardiac cycle. (biologydictionary.net)
1. Which of the following must follow the systole phase of the cardiac cycle in order for the heart to pump blood? (biologydictionary.net)
While the cardiac cycle is not regulated in hagfish, the atrium and ventricle each go through periods of systole, and each go through periods of diastole. (biologydictionary.net)
With GRE at 1.5 T, systole could be assessed in 69% of patients, and an evaluation of the whole cardiac cycle was not possible. (springer.com)
With the SSFP sequence at 1.5 T and GRE at 3 T, an evaluation of the whole cardiac cycle was possible in 71% and 70% of the patients, respectively, and systole was assessable in all patients. (springer.com)

During systole, arterial blood pressure reaches its peak (systolic blood pressure), normally about 90 to 120 mm of mercury in humans. (britannica.com)

I am 70 years old and in good shape except for what has been labelled by my GP as having an extra systole. (mayoclinic.org)
There's a vague sense of unease and anxiety that never seems to let up and I know that life would be so much nicer without this extra systole and the ensuing constant awareness of my heart beating. (mayoclinic.org)
Does extra systole fall in the AFib category? (mayoclinic.org)

Electrical Systole - The nerve impulse signaling the heart muscles to contract. (biologydictionary.net)
Electrical systole opens voltage-gated sodium, potassium and calcium channels. (gutenberg.org)

The objective of this study was to validate a deformable image registration technique, termed Hyperelastic Warping, for left ventricular strain measurement during the systole using cine-gated nontagged MRI with strains measured from tagged MRI. (springer.com)
Left ventricular long axis function in diastolic heart failure is reduced in both diastole and systole: time for a redefinition? (bmj.com)
Tsuiki, K & Ritman, EL 1980, ' Direct Evidence that Left Ventricular Myocardium Is Incompressible Throughout Systole and Diastole ', The Tohoku Journal of Experimental Medicine , vol. 132, no. 1, pp. 119-120. (elsevier.com)

Here we perform 3D tractography of the human heart \(in\) \(vivo\) at both end diastole and end systole. (harvard.edu)
How to Define End-Diastole and End-Systole? (onlinejacc.org)
The aim of this study was to examine the difference in the myocardial volume between end-diastole and end-systole in 24 human volunteers, using steady-state free precession gradient-echo cine imaging of both long- and short-axis views of the left ventricle and a newly developed three-dimensional (3D) analysis method. (umn.edu)
Swingen, C, Wang, X & Jerosch-Herold, M 2004, ' Evaluation of myocardial volume heterogeneity during end-diastole and end-systole using cine MRI ', Journal of Cardiovascular Magnetic Resonance , vol. 6, no. 4, pp. 829-835. (umn.edu)

The terms diastole and systole refer to when the heart muscles relax and contract. (medicalnewstoday.com)
The terms diastole and systole apply to the relaxing and contraction of heart muscles. (nccmed.com)

Medical Dictionary premature systole n. (drugster.info)

Because the heart muscle contracts during systole, "systolic pressure" is the highest pressure in the arterial blood stream during each heart beat. (wikipedia.org)
Note that during systole, the ventricular pressure and arterial pressure spike. (biologydictionary.net)

Regional myocardial blood flow estimates (MBFs) obtained using self-gated systole (0.64 ± 0.26 ml/min/g), self-gated diastole (0.64 ± 0.26 ml/min/g), and ECG-gated scans (0.65 ± 0.28 ml/min/g) were similar. (nih.gov)
With the 3D analysis method, no significant variance in the myocardial volume was found (mean difference=0.1%±9.1%, p=0.88) between end-diastole (ED) and end-systole (ES), while the 2D technique yielded significantly larger values for the LV myocardial volume at ES than ED (mean difference=14.7%±16.8%, p±0.0001). (umn.edu)

Lasting usually 0.3 to 0.4 second, ventricular systole is introduced by a very brief period of contraction, followed by the ejection phase, during which 80 to 100 cc of blood leave each ventricle. (britannica.com)
During this cycle, the period of relaxation is called diastole and the period of contraction is called systole. (medicalnewstoday.com)

The second phase of systole sends blood from the left ventricle to the aorta and body extremities, and from the right ventricle to the lungs . (wn.com)
The students can visually see the systole and the diastole and the contraction of the ventricle. (resources-teachers.com)
Does the hagfish heart, which consists of one atrium and one ventricle, go through the phase of systole? (biologydictionary.net)
When the smaller, upper atria chambers contract in the first phase of systole, they send blood down to the larger, lower ventricle chambers. (gutenberg.org)

Systole causes the ejection of blood into the aorta and pulmonary trunk. (britannica.com)

During systole, the heart's two ventricles contract (squeeze). (wikipedia.org)
then, as the atria start to relax, the ventricles contract (ventricular systole) and pump blood out of the heart. (medicalnewstoday.com)

Systole is the contraction phase of the normal heart cycle during which blood is driven into the aorta and pulmonary artery. (heart.org)
ventricular systole contraction of the ventricles, forcing blood into the aorta and pulmonary artery. (thefreedictionary.com)
During diastole, it directs inflow from the pulmonary veins towards the mitral annulus, and during ventricular systole it retains the inflow volume until the mitral valve reopens. (bmj.com)

Quanta Magazine , 6 July 2020 Instead, the participants responded more fearfully to all the shapes that were presented at systole . (merriam-webster.com)

The phase of diastole occurs after systole, in which the muscles of the heart relax. (biologydictionary.net)
1) A newer classification scheme for heart failure is based not on left or right side failure but rather on whether the failure occurs during systole or diastole. (english-thai.net)

With the 3D software, commissure-commissure plane and 3 perpendicular anteroposterior (AP) planes were generated for imaging the medial, central, and lateral sides of the mitral valve (MV) during mid systole. (ahajournals.org)

The fall in ventricular pressure, at the end of systole is called protodiastole. (kypho.com)

The term usually refers to ventricular systole , which lasts about 0.3 seconds. (enacademic.com)

3) The reflected wave returns to the aorta during systole rather than diastole, increasing systolic work even more and reducing diastolic pressure, on which coronary flow depends. (english-thai.net)
4) Younger people have a highly distensible aorta, which expands during systole and minimises any subsequent rise in blood pressure. (english-thai.net)

Objectives This study aimed to investigate to what extent timing definitions influence strain measurements and which surrogates are reliable and feasible to define end-diastole (ED) and end-systole (ES) during speckle-tracking (STI) analysis. (onlinejacc.org)
Meaning and definitions of systole, translation in Thai language for systole with similar and opposite words. (english-thai.net)
Meaning and definitions of systole, translation in Haitian language for systole with similar and opposite words. (english-dictionary.help)

Systole may refer to: Systole (medicine), a term describing the contraction of the heart Systolic array, a term used in computer architecture Systolic geometry, a term used in mathematics In mathematics, Systoles of surfaces are systolic inequalities for curves on surfaces Also see Introduction to systolic geometry This disambiguation page lists articles associated with the title Systole. (wikipedia.org)
Systole (mathematics) is a term used in mathematics. (enacademic.com)

Blood causes the most pressure against the walls of the arteries when it is being pushed out during systole). (wikipedia.org)
systole - (n.) periodic contraction of the heart and arteries, 1570s, from Gk. (enacademic.com)
In a blood pressure measurement, the top number refers to the pressure in the arteries during systole. (biologydictionary.net)
5) The passive, elastic recoil between systoles maintains the blood pressure, smooths the flow of blood, and forces blood through the coronary arteries while the ventricles are filling. (english-thai.net)

systole, gr. sustolê « contraction » ♦ Physiol. (enacademic.com)

Systole" may also refer to the contraction stage of the contractile vacuole in protozoans. (britannica.com)
Systole is the contraction stage of the heart. (futura-sciences.us)

For your search query Thinking Out Loud Systole 2016 MP3 we have found 1000000 songs matching your query but showing only top 10 results. (mp3musicsongs.com)

Sinoatrial Node - The nerve-embedded region of the right atrium which starts systole by causing the initial nerve impulse. (biologydictionary.net)

during the systole, the atria contracts, pumping blood into the ventricles and, therefore, generating a considerable increase in the pressure of the heart. (pablocalderonsalazar.com)

The heart cycle consists of a systole and diastole of both the atria and ventricles. (encyclopedia.com)

Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/systole. (merriam-webster.com)

The contraction phase of the ventricles is called systole . (kdnuggets.com)
The ventricular systole is followed by a resting or filling phase that is called diastole . (kdnuggets.com)
The cycle involves systole (the contraction phase) and diastole (the relaxation phase). (encyclopedia.com)

it precedes the true or ventricular systole and is indicated by the fourth heart sound. (thefreedictionary.com)
it precedes the true or ventricular systole. (thefreedictionary.com)

The ventricles now perform systole isovolumetrically, which is contraction while all valves are closed-ending the first stage of systole. (wikipedia.org)
When the lower chambers are filled and the valves to the atria are closed, the ventricles undergo isovolumetric contraction (contraction of the ventricles while all valves are closed), marking the first stage of systole. (wn.com)
Systole begins with the closure of AV valves. (kypho.com)
At the beginning of systole, the closure of AV valves produces I heart sound. (kypho.com)

The electrical activity of the heart is followed by mechanical activity, which consists of contraction (systole) and relaxation (diastole). (kypho.com)
Mechanical Systole - The actual contraction of the muscle fibers of heart tissue . (biologydictionary.net)
Mechanical systole is the origin of the pulse . (gutenberg.org)

The adjective for systole is systolic. (enacademic.com)

systole is a topic covered in the Taber's Medical Dictionary . (tabers.com)
Taber's Online , www.tabers.com/tabersonline/view/Tabers-Dictionary/766199/all/systole. (tabers.com)

Diastole is when the heart muscle relaxes and systole is when the heart muscle contracts. (medicalnewstoday.com)
Systole is when the heart muscle contracts. (medicalnewstoday.com)
A systolic murmur is a heart murmur heard during systole, the time the heart contracts, between the normal first and second heart sounds. (enacademic.com)
When the heart contracts and forces the blood out of the ventricles it is known as systole. (abpischools.org.uk)

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Altered vascular reactivity following partial nephrectomy in the rat: a possible mechanism of the blood-pressure-lowering effect of heparin. (1/3311)

Ambulatory blood pressure monitoring and progression in patients with IgA nephropathy. (2/3311)

Effects of calcium-channel blockade in older patients with diabetes and systolic hypertension. Systolic Hypertension in Europe Trial Investigators. (3/3311)

Restriction of placental and fetal growth in sheep alters fetal blood pressure responses to angiotensin II and captopril. (4/3311)

The diameter of the common femoral artery in healthy human: influence of sex, age, and body size. (5/3311)

Acute exercise can improve cardioprotection without increasing heat shock protein content. (6/3311)

Echocardiography-derived left ventricular end-systolic regional wall stress and matrix remodeling after experimental myocardial infarction. (7/3311)

Chordal force distribution determines systolic mitral leaflet configuration and severity of functional mitral regurgitation. (8/3311)

Systole

Diastole

Myocardial Contraction

Mitral Valve

Heart Ventricles

Kinetocardiography

Echocardiography

Blood Flow Velocity

Ventricular Function, Left

Ventricular Function

Heart

Cardiac Volume

Echocardiography, Doppler

Models, Cardiovascular

Atrial Function, Left

Mitral Valve Prolapse

Cardiac-Gated Imaging Techniques

Echocardiography, Three-Dimensional

Heart Auscultation

Mitral Valve Insufficiency

Dogs

Stroke Volume

Coronary Circulation

Hemodynamics

Echocardiography, Doppler, Color

Heart Sounds

Atrial Function

Blood Pressure

Electrocardiography

Echocardiography, Doppler, Pulsed

Torsion, Mechanical

Ventricular Function, Right

Heart Rate

Pulse

Ventricular Pressure

Heart Septum

Cardiomyopathy, Hypertrophic

Myocardial Bridging

Tricuspid Valve

Heart Atria

Ductus Arteriosus

Cardiac Catheterization

Pulsatile Flow

Heart Murmurs

Ventricular Dysfunction, Left

Elasticity

Fetal Heart

Cineangiography

Pericardium

Aortic Valve

Myocardium

Heart Function Tests

Cardiac Output

Stress, Mechanical

Amyl Nitrite

Image Processing, Computer-Assisted

Regional Blood Flow

Heart Block

Papillary Muscles

Doppler Effect

Time Factors

Observer Variation

Magnetic Resonance Imaging, Cine

Pulmonary Circulation

Heart Diseases

Tricuspid Valve Insufficiency

Reproducibility of Results

Coronary Vessels

Endocardium

Reference Values

Aortic Valve Stenosis

Elasticity Imaging Techniques

Echocardiography, Transesophageal

Magnetic Resonance Imaging

Cardiac Pacing, Artificial

Ultrasonography, Doppler

Rheology

Aorta

Counterpulsation

Mitral Valve Stenosis