only seven of the 16 patients ( 44 % ) with ventricular fibrillation who had a precatheterization qtc greater than 0.44 sec had the arrhythmia during angiography of a critically stenosed ( greater than 75 % ) coronary artery , whereas vf followed injection of critically stenosed vessels in eight of 10 ( 80 % ) of those with a normal qtc ( p ns ) .
C0003811
arrhythmia
C0042510
vf