in four patients studied without procainamide , the ejection fraction was 25 % +/- 2.4 % during normal sinus rhythm , dropped to 11.3 % +/- 2.2 % ( p less than 0.05 ) at the onset of ventricular tachycardia , increased to 16.7 % +/- 1.7 % after remaining in ventricular tachycardia for 10 minutes , and returned to 25.3 % +/- 3.7 % in sinus rhythm .
C0033216
procainamide
C0042514
ventricular tachycardia