Low ejection fraction

The ejection fraction, LVEF (Left Ventricular Ejection Fractions), refers to the percentage of stroke volume to end-diastolic volume. When the ventricle contracts, the ventricular blood cannot be fully injected into the arteries. In a normal adult resting state, the volume of the ventricular diastole: the left ventricle is about 145ml, the right ventricle is about 137ml, and the pulsation volume is 60-80ml, that is, ejection. There is still a certain amount of residual blood in the ventricle at the time of completion. The percentage of pulsatile volume in the diastolic volume of the ventricle is called the ejection fraction. Generally, more than 50% belongs to the normal range. The ejection fraction is related to the contractile ability of the myocardium. The stronger the myocardial contractility, the greater the stroke volume and the greater the ejection fraction. In the case of abnormal enlargement of the ventricle and hypoventricular function, the stroke volume may not be clearly distinguished from normal people, but it is not compatible with the increased end-diastolic volume, and the ejection fraction is significantly reduced. Low ejection fraction means that the ejection fraction is below the normal percentage. Patients with cardiac insufficiency are often accompanied by a decrease in ejection fraction. The chance of sudden death from malignant arrhythmia is greatly increased when the ejection point value is reduced below 35%.