Serial electrophysiologic testing identified effective prophylactic drug therapy that prevented induction of sustained PSVT in 90% (19 of 21) of patients with AV nodal reentrant tachycardia.
Cohort (n=21)
Does serial electrophysiologic testing of multiple drugs identify effective prophylactic therapy to prevent induction and recurrence of PSVT in patients with AV nodal reentrant tachycardia?
Serial electrophysiologic testing of multiple drugs is feasible and can define effective prophylactic drug therapy in most patients with AV nodal reentrant paroxysmal tachycardia.
Serial electrophysiologic testing of multiple drugs was performed in 21 patients with recurrent atrioventricular (AV) nodal reentrant paroxysmal supraventricular tachycardia (PSVT). All patients had reproducible sustained PSVT induced before drug administration. Serial daily PSVT induction was attempted after administration of i.v. ouabain (0.01 mg/kg) (16 patients), i.v. propranolol (0.1 mg/kg (17 patients), i.v. ouabain + propranolol (same dosages) (12 patients), i.v. procainamide (600-1000 mg) (17 patients) and oral quinidine (1600-2400 mg/day) (nine patients). In two of 21 patients (10%), no tested drug prevented induction of sustained PSVT. In 19 of 21 patients (90%), one or more drugs prevented induction of sustained PSVT: ouabain--seven patients, propranolol--seven patients, ouabain + propranolol--seven patients, procainamide--11 patients, quinidine--seven patients. The site of action of ouabain and/or propranolol was either the antegrade limb or the retrograde limb (RL) of the circus movement. The site of action of procainamide or quinidine was always the RL. These 19 patients were treated with oral drugs, based on results of serial testing. Eighteen patients were successfully followed for 6-50 months. In 13 of these 18 patients PSVT did not recur. Two patients (11%) had > 95% reduction in frequency of PSVT recurrences, and three (17%) did not respond to chosen oral drugs. Serial electrophysiologic testing of multiple drugs is feasible in patients with AV nodal reentrant paroxysmal tachycardia. Drug responses are variable. In most but not all patients, serial electrophysiologic testing defines effective prophylactic drug therapy. This method of defining prophylactic drug therapy appears most suitable for patients with poorly tolerated tachycardias that occur only sporadically.
Bauernfeind et al. (Mon,) conducted a cohort in atrioventricular nodal reentrant paroxysmal supraventricular tachycardia (n=21). Serial electrophysiologic testing of multiple drugs was evaluated on Prevention of induction of sustained PSVT. Serial electrophysiologic testing identified effective prophylactic drug therapy that prevented induction of sustained PSVT in 90% (19 of 21) of patients with AV nodal reentrant tachycardia.