St. Jude Medical for Medical Professionals

FFRWs are sensed in approximately one-third of patients with DDD pacemakers and represent the primary reason for inappropriate automatic mode switch (AMS). We hypothesized that decreasing the atrial lead anode to cathode tip-to-ring electrode spacing reduces FFRW sensing. The OptiSense® 1699T Lead Study was a prospective, multi-center, randomized trial designed to evaluate ability of a 1.1mm bipolar tip-to-ring spacing to attenuate FFRW signals and decrease inappropriate AMS.

Ralph S. Augostini, MD, Scott L. Beau, MD, David Henderson, MD, W. Ben Johnson, MD, Stephen P. Chough, MD, Charles Athill, MD and John P McKenzie, III, MD

Heart Rhythm, (4)5:Supplement, May 2007.