Ventricular repolarization of Wistar rat heart during the early postnatal ontogenesis

An investigation of electrical heart activity in rats aged from 1 to 30 days of postnatal ontogenesis has shown that cardioelectric field at the period of ventricular repolarization is formed on the rat’s body surface during the ascending phase of sII – wave in spite of the presence or the absence of STII – segment. Spatial and temporal dynamics of the cardioelectric field at the period of ventricular repolarization that is typical for adult animals is formed to the age of 30 days of postnatal development.