presystole

presystole

 [pre-sis´to-le] the interval just before systole.

pre·sys·to·le

(prē-sis'tō-lē), That part of diastole immediately preceding systole. Synonym(s): late diastole

pre·sys·to·le

(prē-sis'tŏ-lē) That part of diastole immediately preceding systole.