Patients with long QT syndrome and torsades de pointes exhibit asynchronous repolarization and delayed repolarization humps in right ventricular monophasic action potentials, suggesting focal re-excitation as a mechanism for severe arrhythmias.
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Hypothesis-generating for focal re-excitation in LQTS-TdP; prospective validation required before any clinical application.
Bonatti et al. (1983) studied this question.
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