Abstract
Hutter and Trautwein1 reported that vagal stimulation results in hyperpolarization, complete disappearance of action potentials, and a shortening of duration of the post-stimulation pacemaker potentials of the frog sinus venosus. No report has appeared regarding the effects of stimulation of external vagal fibres on sino-atrial (S-A) node action potentials of mammalian heart. In the experiments described here, we set out to test the responses of the various types of S-A node fibres2 to vagal stimulation of isolated rabbit atria.
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