Diastole

The diastole of the chambers of the heart (Greek διαστολή " expansion ") is the relaxation and filling phase, in contrast to the systole, the tensing and expulsion. The atria diastole occurs during the systole of the chambers.

Classification

Mechanical diastole begins with the relaxation of the ventricular muscle and simultaneous closure of the semilunar valves of the great arteries. It ends with the closing of the atrioventricular valves and the reopening of the pocket flaps. In the ECG, this is the phase between the end of the T wave to the beginning of the Q wave. In part, the phase is called between the beginning of the T wave and the beginning of the next P wave as so-called " electrical diastole ." In other literature, the electrical diastole is equated with the mechanical. Echocardiography diastolic filling of the ventricle is characterized by E- and A- wave.

Mechanical diastole is divided into four phases:

• Relaxation phase ( isovolumic relaxation): Period after the contraction of the ventricles, in which both bags but also of sailing flaps are closed ECG: T wave end by mid- TP line
• Echo: the end of the systolic efflux to start E- wave

• ECG: Mid TP line to the beginning of the P wave
• Echo: E- wave

• ECG: P wave
• Echo: phase between E- wave and A-wave

• ECG: P- R- range
• Echo: A wave