protodiastole

protodiastole

(prō″tō-dī-ăs′tō-lē) [Gr. protos, first, + diastole, expansion]

The first of four phases of ventricular diastole characterized by a drop in intraventricular pressure. This occurs immediately after the second heart sound.

protodiastole

the beginning of ventricular relaxation, terminating when the semilunar valves close.