(n) absence of systole; failure of the ventricles of the heart to contract (usually caused by ventricular fibrillation) with consequent absence of the heart beat leading to oxygen lack and eventually to death, Syn.cardiopulmonary arrest, cardiac arrest
n. (Physiol.) Contraction of only one ventricle of the heart. [ 1913 Webster ]
☞ 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. [ 1913 Webster ]
n. [ Pref. peri- + systole: cf. F. périsystole. ] (Physiol.) The interval between the diastole and systole of the heart. It is perceptible only in the dying. [ 1913 Webster ]
n. [ NL., fr. Gr. &unr_;, fr. &unr_; to contract; sy`n with + &unr_; to set, place. ] 1. (Gram.) The shortening of the long syllable. [ 1913 Webster ]
2. (Physiol. & Biol.) The contraction of the heart and arteries by which the blood is forced onward and the circulation kept up; also, the contraction of a rhythmically pulsating contractile vacuole; -- correlative to diastole. -- Sys*tol"ic a. [Webster 1913 Suppl.]
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