Multicenter, Prospective, Randomized Safety and Efficacy Study of a New Atrial-Based Managed Ventricular Pacing Mode (MVP) in Dual Chamber ICDs

Autor:	Megan Mueller, Feng Tang, John Lingle, David A. Casavant, Kenneth A. Ellenbogen, Robert A. Betzold, Michael O. Sweeney, Todd J. Sheldon
Rok vydání:	2005
Předmět:	Adult Male medicine.medical_specialty Nyha class law.invention Randomized controlled trial law Physiology (medical) Internal medicine medicine Humans Prospective Studies PR interval Intensive care medicine Prospective cohort study Aged business.industry Cardiac Pacing Artificial Atrial fibrillation Middle Aged Ventricular pacing equipment and supplies medicine.disease Defibrillators Implantable Heart failure Atrioventricular Node Cardiology Female Cardiology and Cardiovascular Medicine business Efficacy Study
Zdroj:	Journal of Cardiovascular Electrophysiology. 16:811-817
ISSN:	1540-8167 1045-3873
DOI:	10.1111/j.1540-8167.2005.40766.x
Popis:	Multicenter, Prospective, Randomized Safety and Efficacy Study of a New Atrial-Based Managed Ventricular. Background: Ventricular desynchronization caused by right ventricular pacing may impair ventricular function and increase risk of heart failure (CHF), atrial fibrillation (AF), and death. Conventional DDD/R mode often results in high cumulative percentage ventricular pacing (Cum%VP). We hypothesized that a new managed ventricular pacing mode (MVP) would safely provide AAI/R pacing with ventricular monitoring and DDD/R during AV block (AVB) and reduce Cum%VP compared to DDD/R. Methods: MVP RAMware was downloaded in 181 patients with Marquis DR ICDs. Patients were initially randomized to either MVP or DDD/R for 1 month, then crossed over to the opposite mode for 1 month. ICD diagnostics were analyzed for cumulative percentage atrial pacing (Cum%AP), Cum%VP, and duration of DDD/R pacing for spontaneous AVB. Results: Baseline characteristics included age 66 ′ 12 years, EF 36 ′ 14%, and NYHA Class II-III 36%. Baseline PR interval was 190 ′ 53 msec and programmed AV intervals (DDD/R) were 216 ′ 50 (paced)/189 ′ 53 (sensed) msec. Mean Cum%VP was significantly lower in MVP versus DDD/R (4.1 ′ 16.3 vs 73.8 ′ 32.5, P < 0.0001). The median absolute and relative reductions in Cum%VP during MVP were 85.0 and 99.9, respectively. Mean Cum%AP was not different between MVP versus DDD/R (48.7 ′ 38.5 vs 47.3 ′ 38.4, P = 0.83). During MVP overall time spent in AAI/R was 89.6% (intrinsic conduction), DDD/R 6.7% (intermittent AVB), and DDI/R 3.7% (AF). No adverse events were attributed to MVP. Conclusions: MVP safely achieves functional atrial pacing by limiting ventricular pacing to periods of intermittent AVB and AF in ICD patients, significantly reducing Cum%VP compared to DDD/R. MVP is a universal pacing mode that adapts to AVB and AF, providing both atrial pacing and ventricular pacing support when needed.
Databáze:	OpenAIRE
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