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Clinical characteristics and results of electrophysiologic testing in young adults with ventricular tachycardia or ventricular fibrillation.

Thirty-one patients 16 to 40 years of age (mean +/- SD = 30.7 +/- 7 years) had one or more episodes of sustained ventricular tachycardia (VT) or ventricular fibrillation (VF). Underlying cardiac abnormalities consisted most commonly of cardiomyopathy (nine), long QT syndrome (LQTS) (five), and mitral valve prolapse (five); no identifiable heart disease was found in four patients. Programmed ventricular stimulation induced VT in only one of four patients with the LQTS but induced VT in 64% of 22 patients with other abnormalities. Chronic drug treatment was based either on serial electropharmacologic testing or was empiric when electrophysiologic testing failed to provoke an arrhythmia. Using this approach, we found a 13% incidence of recurrent VT and a 10% mortality over a follow-up period of 18.1 +/- 13.9 months. In young adults with VT or VF, an underlying cardiac abnormality can usually be found. Extensive evaluation should be performed to uncover the underlying cardiac abnormality as this may influence chronic management.

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