administration of verapamil ( 0.145 mg/kg ) resulted in termination of tachycardia in 19 of 20 patients but was followed by symptomatic arrhythmias in 2 : preexcited atrial flutter in 1 patient and preexcited atrial tachycardia in another .
C0003811
arrhythmias
C0004239
atrial flutter