Normal value of left ventricular systolic function

Every normal person's ventricle has two functions: contraction and relaxation. Only by keeping these two functions normal can the normal function of the heart be maintained. When patients experience arrhythmia, palpitations, etc., they should go to the hospital in time for a comprehensive heart examination. If the ventricles do not contract normally, it may cause the above two problems. So what is the normal value of left ventricular systolic function for normal people?

What are the indicators of left ventricular diastolic function?

Left ventricular diastole includes two phases: isovolumetric relaxation and filling. The latter is also divided into rapid filling phase, slow filling phase and left atrial contraction phase; it is a complex physiological process involving multiple factors, and there is currently no recognized indicator for comprehensive evaluation of left ventricular diastolic function.

(1) During the isovolumetric relaxation period, the main factor affecting the left ventricular diastolic function is the relaxation of the left ventricular myocardium. The indicators that can quantitatively reflect this performance mainly include: the maximum rate of decrease of left ventricular pressure (-dp/dt^) and the left ventricular relaxation time constant (T). The normal values ​​of these indicators are: dp/dt^: (243±34.8)~(389±100) kPa/s[ (1825±261)(2922±750) mmHg/s]. Constant T: 2.0.

6) E wave deceleration time (EDT): refers to the time occupied by the deceleration branch of the E wave. Normal value: (199±32) ms.

7) Rapid filling fraction (RFI): refers to the ratio of the maximum E wave velocity to the average diastolic velocity. Normal value: >2.0. 8) The time between the maximum velocity of A wave and the reversal of A wave velocity in the left ventricular outflow tract (A-Ar): Normal value: >45ms. 9) The pulmonary venous blood flow reversal velocity during atrial systole (AR): Normal value: