The effect of phentolamine on atrioventricular conduction in man.

The effects of phentolamine, 0.3 mg/mm given intravetient and it had no effect on the HQ or HS intervals. This nopsly for 15 minutes, on atrioventricular and intravenrepresents ao improvement in conduction through the tricular conduction were studied in seven cardiac patients atrioventricular node. Phentolamine had no effect on aod in four normal subjects. Recordings were made at atrioventricular and intraventricular conduction in the varied heart rates, utilizing atrial pacing. Phentolamine four normal subjects. significantly reduced the AH interval in every cardiac pa-