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Intracavitary electrocardiography as a guide to pacemaker postitioning.

Transvenous cardiac pacing is now routinely used as therapy for heart block. As experience with transvenous pacing has increased, it has become apparent that a significant cause of pacemaker failure has resulted from malposition of the electrode catheter in the coronary veins. A simple technique ensures proper placement of the electrode catheter in the right ventricle by utilizing the intracavitary electrocardiogram.