Effect of pacemaker-induced arrhythmias on coronary blood velocity in conscious man.
With the use of the Doppler ultrasonic catheter telemetry system, phasic left coronary blood velocity was measured in 34 conscious subjects during transvenous pacemaker insertion and right ventricular endocardial pacing. Ventricular premature depolarizations and ventricular tachycardia, occurring as consequences of pacing catheter manipulation and competitive rhythms, reduced peak coronary blood velocity by approximately one halft. These findings provide insight into the genesis of sudden death associated with pacemaker insertion, competitive or repetitive arrhythmias, and pacemaker "runaway."
D000328:Adult; D000368:Aged; D001145:Arrhythmias, Cardiac / Q000209:etiology* / Q000503:physiopathology; D001783:Blood Flow Velocity; D001794:Blood Pressure; D006328:Cardiac Catheterization; D003326:Coronary Circulation; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D010701:Phonocardiography; D014463:Ultrasonography