Cardiac pacemakers.
Johnson
Charles D
CD
University of Puerto Rico School of Medicine, Section of Cardiology, San Juan, Puerto Rico.
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004562:Electrocardiography; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial