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Depolarisation and repolarisation sequences of ventricular epicardium in chickens (Gallus gallus domesticus).

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Department of Visceral Physiology, Institute of Physiology of the Russian Academy of Sciences, 50 Pervomayskaya st., GSP-2, Komi Republic, Syktyvkar 167982, Russia.


Activation and recovery sequences were mapped by means of 64-channel synchronous recording of extracellular potentials on ventricular epicardium in chickens. Ventricular epicardium was depolarized due to multiple breakthroughs. The recovery of ventricular epicardium occurs from the apex to the base of heart and does not repeat the activation sequence. Gradients of repolarisation exist over the ventricular epicardium in birds. Repolarisation pattern of ventricular epicardium depends primarily on intrinsic spatial heterogeneities of ARIs over epicardium.

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