Afterdepolarization

Afterdepolarizations are abnormal depolarizations of cardiac myocytes that interrupt phase 2, phase 3, or phase 4 of the cardiac action potential in the electrical conduction system of the heart. Afterdepolarizations may lead to cardiac arrhythmias. Afterdepolarization is commonly a consequence of myocardial infarction, cardiac hypertrophy, or heart failure.^[1] It may also result from congenital mutations associated with calcium channels and sequestration.^[2]

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^ Priori, S. G.; Napolitano, C.; Tiso, N.; Memmi, M.; Vignati, G.; Bloise, R.; Sorrentino, V.; Danieli, G. A. (2001-01-16). "Mutations in the cardiac ryanodine receptor gene (hRyR2) underlie catecholaminergic polymorphic ventricular tachycardia". Circulation. 103 (2): 196–200. doi:10.1161/01.cir.103.2.196. ISSN 0009-7322. PMID 11208676.