evaluation of 15 clinical , hemodynamic and electrophysiologic variables by stepwise logistic regression identified two independent predictors of successful response to oral antiarrhythmic drugs : 1 ) noninducibility of ventricular tachycardia after intravenous procainamide ( p less than 0.001 ) , and 2 ) left ventricular ejection fraction greater than or equal to 40 % ( p less than 0.05 ) .
C0042514
ventricular tachycardia
C0033216
procainamide