in a total of 18 patients , 7 females and 11 male patients with ages ranging from 23 to 70 years ( mean : 45.5 +/- 14.5 ) diagnostic his bundle studies incorporating programmed atrial and ventricular pacing for the induction of tachycardias was performed before and after betablockade with the cardioselective betablocking agent atenolol , in a dose of 5 mg given iv . over 3 to 5 minutes .
C0042514
ventricular
C0004147
atenolol