Abstract
Ventricular fibrillation (VF) is characterized by ongoing wavebreak, but the underlying mechanisms are controversial. The Mother Rotor Hypothesis posits that wavebreak is an epiphenomenon due to fibrillatory conduction block distal to a fast stable rotor, whereas the Multiple Wavelet Hypothesis views wavebreak as the dynamic process essential for maintaining VF. Here we investigated the role of short-term cardiac memory (STCM) with respect to these two hypotheses. STCM refers to the dependence of action potential duration (APD) on total pacing history, unlike APD restitution (APDR), which considers only the immediately previous diastolic interval.
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