Hem`i*sys"to*le (?), n. Physiol.
Contraction of only one ventricle of the heart.
⇒ Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole.
© Webster 1913.