Initial experience with single lead VDD system. Case study.

A single pass lead with dual chamber electrode system, designed for atrial and ventricular sensing and ventricular pacing (VDD), was implanted in a 63-year-old man with a history of syncope and second degree atrioventricular (AV) block. Intact VDD pacing function was confirmed at rest and during treadmill exercise. There were no postoperative complications. A single pass lead system that allows VDD mode pacing in patients with symptomatic AV block and competent sinus node function offers several advantages over traditional two lead dual chamber systems. These advantages include enhanced atrial sensing due to a differentially processed signal reliable for P wave detection and effective for rejection of far field ventricular signals, lowered cost and reduced implant time.