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An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat). It can refer to the cardiac atrium, [1] ventricle, [2] gall bladder, [3] or leg veins, [4] although if unspecified it usually refers to the left ventricle of the ...
Ejection fraction (EF) is a parameter related to SV. EF is the fraction of blood ejected by the left ventricle (LV) during the contraction or ejection phase of the cardiac cycle or systole. Prior to the start of systole, during the filling phase , the LV is filled with blood to the capacity known as end diastolic volume (EDV). During systole ...
Myocardial infarction or cardiomyopathy causes damage to the myocardium, which impairs the heart's ability to eject blood and, therefore, reduces ejection fraction. This reduction in the ejection fraction can manifest itself as heart failure. Low EF usually indicates systolic dysfunction, and severe heart failure can result in EF lower than 0.2 ...
Stroke volume is an important determinant of cardiac output, which is the product of stroke volume and heart rate, and is also used to calculate ejection fraction, which is stroke volume divided by end-diastolic volume. Because stroke volume decreases in certain conditions and disease states, stroke volume itself correlates with cardiac function.
Several parameters can be calculated for each loop (e.g. end-diastolic pressure, end-systolic pressure, ejection and filling intervals, contractility index, stroke volume, and ejection fraction). More importantly, other interesting parameters are derived from series of loops obtained under changing conditions.
Cardiac physiology. Cardiac physiology or heart function is the study of healthy, unimpaired function of the heart: involving blood flow; myocardium structure; the electrical conduction system of the heart; the cardiac cycle and cardiac output and how these interact and depend on one another.
Specialty. Cardiology. Heart failure with preserved ejection fraction (HFpEF) is a form of heart failure in which the ejection fraction – the percentage of the volume of blood ejected from the left ventricle with each heartbeat divided by the volume of blood when the left ventricle is maximally filled – is normal, defined as greater than 50 ...
Ejection fraction (= stroke volume / end-diastolic volume) Cardiac output is mathematically ` to systole [clarification needed] Inotropic, chronotropic, and dromotropic states; Cardiac input (= heart rate * suction volume Can be calculated by inverting terms in Fick principle) Suction volume (= end-systolic volume + end-diastolic volume)