The quality of cardiac function can be expressed by stroke output, cardiac output, cardiac index, ejection fraction, stroke work and work per minute. The average stroke volume of a normal person is 70 ml. The average cardiac output is 5.0 liters per minute. The heart index at rest and on an empty stomach is about 3.0-3.5 liters per minute per square meter. The ejection fraction of healthy adults at rest is about 55%-65%.
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