Regulation of Stroke Volume | 合法醫療器材資訊網

RegulationofStrokeVolume...Ventricularstrokevolume(SV)isoftenthoughtofasthetheamountofblood(mL)ejectedperbeatbytheleftventricleintotheaorta( ...

Ventricular stroke volume (SV) is often thought of as the amount of blood (mL) ejected per beat by the left ventricle into the aorta (or from the right ventricle into the pulmonary artery). This assumes, however, that all the blood leaving the ventricle is ejected into the outflow tract, but this is not the case when there is atrioventricular valve regurgitation[1] or an interventricular septal defect[2]. Therefore, a more precise definition for SV and one that is used in echocardiography when assessing ventricular function is the difference between the ventricular end-diastolic volume (EDV)[3] and the end-systolic volume (ESV)[4]. The EDV is the filled volume of the ventricle before contraction, and the ESV is the residual volume of blood remaining in the ventricle after ejection. In a typical heart, the EDV is about 120 mL of blood and the ESV is about 50 mL of blood. The difference in these two volumes, 70 mL, repres...