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The Influence of Cycle Length On the Effective and Functional Refractory Period of the Human Av Node

Norman A. Cagin, Dorothy Kunstadt, Barrie H. Levitt

Abstract

The influence of atrial cycle length on the effective and functional refractory period of the human AV node and atrium is presented. In general, decrements in atrial cycle lengths resulted in a shortening of the refractory period of the atrium and the functional refractory period of the AV node. The effective refractory period of the AV node was not significantly prolonged. The physiologic significance of the effective and functional refractory periods of the AV node are discussed.

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Key concepts: Refractory period, Medicine, Refractory (planetary science), Effective refractory period, Atrium (architecture), Node (physics), Cardiology, Period (music)