The Impact of the Distance between the Atrial Electrode and the Atrial Wall on Atrial Undersensing in Patients with VDD Pacemakers: Long‐Term Follow‐Up

Abstract

The distance between atrial electrode and atrial wall does not appear to affect AUS incidence in VDD pacemakers. For VDD electrodes closer to atrial wall, AUS was significantly less likely in DABR-type electrodes.

Long-term follow-up of DDD and VDD pacing: a prospective non-randomized single-centre comparison of patients with symptomatic atrioventricular block

“…The distance between the floating detection bipole and right atrial wall has also been studied 21,22 but its role remains controversial. 23 Secondly, an attractive haemodynamic explanation to intermittent atrial sensing failure has been provided by Carbone et al 24 , using mitral Doppler flow analysis. A decrease in atrial volume at the opening of the AV valves, allowing the freely floating atrial lead to lie close to the right atrial wall, favours sensing of a small intracardiac electrogram and hence a better atrial signal detection.…”