Abstract
Actions of pronethalol on the electrophysiological properties of the mammalian heart muscle were investigated. Pronethalol decreased the pacemaker activity of the ventricle (right bundle branch of dog) and of the sinus node (rabbit). Conduction velocity, critical membrane potential and maximum depolarization rate were all reduced by pronethalol. Absolute and relative refractory period were prolonged, and Na-inactivation curve shifted to the right (inhibition of Na-carrier system) by pronethalol, whereas no or little effects, if any, were observed on the resting potential and membrane resistance in resting and acting phases.The mechanism of antiarrhythmic action of pronethalol was discussed, and it was concluded that the mechanism is not the same as that for the wellknown beta-blocking action of pronethalol.
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