Vulnerability to Fibrillation and the Ventricular-Excitability Curve

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Abstract
The cat auricle and ventricle and the turtle ventricle resemble the auricle and ventricle of the dog with respect to phenomena of excitability recovery following a normal beat. These chambers are most vulnerable to fibrillation at those intervals of the cycle which show a dip in the excitability-recovery curve. In ventricles showing a clear early and secondary or major dip in the recovery curve there are two corresponding vulnerable periods. These are clearly separated by an interval during which suprathreshold stimuli give either single extrasystoles or no propagated response.

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