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pl. diastases [Gr. diastasis, separation]
1. In surgery, injury to a bone involving separation of an epiphysis.
2. In cardiac physiology, the last part of diastole. It follows the period of most rapid diastolic filling of the ventricles, consists of a period of retarded inflow of blood from atria into ventricles, lasts (in humans under average conditions) about 0.2 sec, and is immediately followed by atrial systole.