Multicenter clinical experience with an atrial lead designed to minimize far-field R-wave sensing.

Aims: To evaluate a novel atrial lead designed to reduce far-field sensing.
Methods and Results: Sixty-three patients with standard pacing indications were randomized to receive an OptiSense 1699T (St Jude Medical, USA) or conventional pacing lead in the right atrium. Post-implant follow-up was conducted for all patients at 90 days and for a subset at 360 days. Standard electrical parameters were measured. Thresholds of sensing were determined for far-field ventricular signals. The number of inappropriate mode switches was determined from the stored intracardiac electrogram (IEGM). At 90 days, an IEGM Holter recorded 24 h of IEGM. With atrial sensitivity programmed at 0.3 mV, no far-field sensing occurred in the OptiSense group, but it did occur in 20% and 30% of the control group at 90 and 360 days, respectively. Inappropriate mode switching was observed in 4% of the OptiSense group in contrast to 23% of the control group. The IEGM Holter found no far-field sensing in the OptiSense group, but did find 83 023 far-field events from 22% of control patients. The standard electrical parameters of the OptiSense leads were acceptable.
Conclusion: The OptiSense lead reduced ventricular far-field sensing in the atrium while maintaining satisfactory pacing and sensing performance, resulting in less inappropriate mode switch.