Abstract
Seventy pacemaker implantations were performed since Aug. 1981 to Oct. 1984 in Himeji Brain and Heart Center. Of these 70, arrhythmias and malfunction, such as, myopotential interference, reentrant loop tachycardia, pseudo-pseudo fusion, and malfunction of demand pacemaker, were seen in 4. Myopotential interference is unipolar sensing abnormality caused by myopotential. Reentrant loop tachycardia was seen in DDD pacemaker. It may appear when ventricular paced beats are conducted retrogradely to the atria as the ensuing P wave triggers the pacemaker to stimulate the ventricle. Pseudo-pseudo fusion is delivery of an atrial spike within the QRS complex in DVI pacemaker. Then ventricular spike is seen in T wave. Malfunction is serious problem, every malfunction must be reported to get better pacemaker.
