Stroke Volume And Quantum Analyzer:

The blood volume output by the heart in beat each time. Influence Factors:

Five aspects

(1) The effective circulating blood volume (BV): when the blood volume is insufficient, the returned blood volume is little, and the SV is reduced.

(2) The weakening of myocardial contractility: the contractility is low, and the pressure is low, so the ejected blood volume is less.

(3) The extent of ventricular filling: In range of myocardial elasticity, the greater the degree of filling is, the stronger the retraction is, and the SV is increased. The normal heart chamber capacity is 173ml, but not all of the blood is ejected. The blood volume in the left ventricle is about 60% -70% of the total capacity, being about 125ml or so. Usually, the Chinese people's average SV is 80-90ml.

(4) The size of peripheral vascular resistance (PR). The PR is large, and then the SV is reduced; the PR is small, and then the SV is increased.

(5) Ventricle wall movement.

When the ventricle is contracted, the cardiac muscle is in coordinated movement. If the myocardial contraction is not coordinated, the SV is reduced. For instance, some patients with myocardial infarction have part of infarction, so the myocardial contractility is inconsistent and the SV is reduced. However, under normal circumstances, the ventricle wall movement can not be abnormal.