all 23 patients had inducible sustained ventricular tachyarrhythmias ( 18 had uniform morphology sustained ventricular tachycardia ( vt ) and 5 had ventricular fibrillation [ vf ] ) during control electrophysiologic study , and therapy had failed with a type ia agent and mexiletine alone .
C0042510
ventricular fibrillation
C0025887
mexiletine