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Ventricular fibrillation in hibernators and nonhibernators.

Abstract：

:Previous studies have shown that there are differences between hibernators and nonhibernators in the susceptibility to ventricular fibrillation. In an attempt to clarify these differences ventricular fibrillation was induced in isolated hearts of the hibernator, the woodchuck, Marmota monax by cooling, warming, puncture, and by norepinephrine administration. It was shown that the hearts of the winter animals were completely resistant toward the ventricular fibrillation inducing agents, which was not the case for the hearts from summer, active animals. Further, the hearts of another hibernator, the hedgehog, Erinaceus europaeus, and guinea pig, Cavia porcellus, were studied electrophysiologically in anesthetized animals with open chests and with bipolar electrodes attached to the epicardium. During pacing it was shown that the hedgehog had a higher stimulus threshold and a lower maximal following frequency than the guinea pig. The summer hedgehogs showed resistance toward both ventricular premature beats and ventricular fibrillation. Sixty percent of the summer hedgehogs and 100 percent of the winter hedgehogs and guinea pigs developed ventricular fibrillation. The threshold for ventricular fibrillation was highest for summer hedgehogs. The effective refractory period of papillary muscle of summer hedgehogs was shorter than that of guinea pigs. The force frequency relationship of the isolated papillary muscle showed a greater degree of independence in the hedgehog than in the guinea pig. Consequently, the results show that the heart of the hibernator is more arrhythmia resistant than the heart of the nonhibernator, although there are seasonal differences.

journal_name

Cryobiology

journal_title

Cryobiology

authors

Duker GD,Olsson SO,Hecht NH,Senturia JB,Johansson BW

doi

10.1016/0011-2240(83)90031-7

subject

Has Abstract

pub_date

1983-08-01 00:00:00

pages

407-20

issue

4

eissn

0011-2240

issn

1090-2392

pii

0011-2240(83)90031-7

journal_volume

20

pub_type

杂志文章

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