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Modalities applied to measurement of ejection fraction is an emerging field of medical mathematics and subsequent computational applications. The first common measurement method is echocardiography, [7] [8] although cardiac magnetic resonance imaging (MRI), [8] [9] cardiac computed tomography, [8] [9] ventriculography and nuclear medicine (gated SPECT and radionuclide angiography) [8] [10 ...
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%; [1] this may be measured by echocardiography or cardiac catheterization.
Ejection fraction: 66% (± 6%) [2] 67% (± 4.6%) [3] Heart rate: 60–100 bpm [4] 60–100 bpm [4] Cardiac output: 4.0–8.0 L/minute [5] 4.0–8.0 L/minute [5]
A more accurate classification of heart failure type is made by measuring ejection fraction, or the proportion of blood pumped out of the heart during a single contraction. [60] Ejection fraction is given as a percentage with the normal range being between 50 and 75%. [60] The types are:
In cardiovascular physiology, stroke volume (SV) is the volume of blood pumped from the ventricle per beat. Stroke volume is calculated using measurements of ventricle volumes from an echocardiogram and subtracting the volume of the blood in the ventricle at the end of a beat (called end-systolic volume [note 1]) from the volume of blood just prior to the beat (called end-diastolic volume).
Indications for surgery for chronic MR include signs of left ventricular dysfunction with ejection fraction less than 60%, severe pulmonary hypertension with pulmonary artery systolic pressure greater than 50 mmHg at rest or 60 mmHg during activity, and new-onset atrial fibrillation. [citation needed]
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Ejection fraction: 66% (± 6%) [7] 67% (± 4.6%) [8] Heart rate: 60–100 bpm [9] 60–100 bpm [9] Cardiac output: 4.0–8.0 L/minute [10] 4.0–8.0 L/minute [10 ...
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