Why the study?
Does countershock restore viable blood pressures in a dog model of ventricular fibrillation after more than 1 minute of complete anoxia?
Does countershock restore viable blood pressures in a dog model of ventricular fibrillation after more than 1 minute of complete anoxia?
In a canine model, countershock fails to restore viable hemodynamics if coronary circulation is interrupted for more than one minute during ventricular fibrillation.
Answers are grounded in this paper and cite their sources.
Countershock after >1 min anoxia fails to restore hemodynamics in canine VF; leaves open optimal timing for human resuscitation.
The dog's ventricles did not generally survive interruption of coronary circulation during fibrillation for more than about 1 minute, in the sense that useful coordinated beats sufficient for recovery are reestablished without massage. These results caution us not to entertain too high hopes of resuscitating human hearts by the countershock method. Countershock can stop fibrillation; but complete anoxia beyond one minute generally prevents a resumption of beats sufficiently vigorous to reestablish viable blood pressures.
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Dow et al. (1940) studied Fibrillation and complete anoxia. Countershock was evaluated on Resumption of coordinated beats sufficient to reestablish viable blood pressures.
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