Comparative Evaluation of Acute and Long‐Term Clinical Performance of Two Single Lead Atrial Synchronous Ventricular (VDD) Pacemakers: Diagonally Arranged Bipolar Versus Closely Spaced Bipolar Ring Electrodes
Abstract:Floating P wave sensing can be derived from bipolar atrial electrodes with different electrode configurations, although the relative clinical efficacy of these methods of atrial sensing has not been studied. We evaluated 32 sex and age matched patients with advanced AV block who received AV synchronous pacers using either a single lead with diagonally arranged bipole (Unity VDDR, Model 292, Intermedics Inc.) or closely spaced bipolar complete ring electrodes (Thera VDD, Model 8948, Medtronic Inc.). The total s… Show more
“…5,[7][8][9] Overall incidence of AUS was 22%. In spite of some methodological differences and vigorousness in the assessment of AUS, our results are comparable to previous reports.…”
Section: Discussionmentioning
confidence: 99%
“…8,12 In a study in which all the atrial sensitivities were programmed to the most sensitive levels, Hunziker et al reported that maximum programmable atrial sensitivity was a predictor of loss of AV synchrony. This was not surprising as it has been well known that the higher the programmed atrial sensitivity, the higher the atrial sensing capability.…”
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.
“…5,[7][8][9] Overall incidence of AUS was 22%. In spite of some methodological differences and vigorousness in the assessment of AUS, our results are comparable to previous reports.…”
Section: Discussionmentioning
confidence: 99%
“…8,12 In a study in which all the atrial sensitivities were programmed to the most sensitive levels, Hunziker et al reported that maximum programmable atrial sensitivity was a predictor of loss of AV synchrony. This was not surprising as it has been well known that the higher the programmed atrial sensitivity, the higher the atrial sensing capability.…”
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.
“…Further studies will be required to compare the incidence of VDD versus DDD pacing in suppressing AF. (30) …”
Section: Ams In Vdd Pacemakersmentioning
confidence: 99%
“…Although reprogramming to a non-tracking mode (such as DVI, DDI or DDIR) prevents this clinical event, these modes do not provide appropriate AV synchrony if the sinus rate exceeds the programmed lower rate. (26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37) Limitation of the upper tracking rate only partly addresses this problem and may compromise exercise capacity or lead to symptoms from pacemaker Wenckebach behaviour at relatively slow rates. In response to this clinical dilemma, a variety of mode-switching algorithms has been devised that are meant to prevent tracking of pathological atrial tachy-arrhythmias while allowing ventricular pacing that is synchronous with the atrial electrocardiogram during sinus rhythm [17][18][19].…”
“…[4][5][6] Today, multiple VDD pacing systems are on the market and their clinical performance is such that usually more than 98% of all beats are correctly sensed in the atrium and used for triggered ventricular pacing in patients with AV block. [7][8][9][10] Although the sensed atrial signals from floating electrodes are always smaller and more variable than signals from leads with fixed atrial wall contact, the mean P wave amplitudes remain very stable over time. In combination with dedicated VDD pulse generators that oVer a higher atrial sensitivity than conventional DDD pacemakers, the atrial sensing safety margins typically are 4-6 times higher than the corresponding atrial sensing threshold.…”
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.