Abstract
Electrophysiologic modifications produced by intravenous administration of 0.1 mg/Kg Oxprenolol were studied in 16 subjects with estimated normal impulse formation and conduction. Significant effects were sinus bradycardia, mild increase of sino-atrial conduction time, depression of intranodal conduction and prolongation of A-V node refractory periods. Sinus node recovery time and atrial refractory periods were unchanged. Infranodal conduction and the refractory periods of the His-Purkinje system, as well as of the bundle branches, were unchanged. These effects are compared with those observed after intravenous Propranolol and Prindolol.
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