Bachmann's bundle and coronary sinus ostial pacing accentuate left atrial electrical dyssynchrony in an acute canine model

Autor:	Indrajit, Choudhuri, David, Krum, Anuj, Agarwal, John, Hare, Marek, Belohlavek, Abdur, Ahmad, Mamatha, Pinninti, Bijoy K, Khandheria
Rok vydání:	2014
Předmět:	Dogs Treatment Outcome Heart Conduction System Acute Disease Atrial Fibrillation Body Surface Potential Mapping Cardiac Pacing Artificial Coronary Sinus Animals Heart Atria
Zdroj:	Journal of cardiovascular electrophysiology. 25(12)
ISSN:	1540-8167
Popis:	In patients with intraatrial conduction delay and sinus node (SN) dysfunction, pacing Bachmann's bundle (BBR) and coronary sinus ostium (CSO) has been suggested to achieve atrial resynchronization with potential beneficial impact on atrial fibrillation and diastolic heart failure. Clinical studies have not shown superiority of one approach.We studied electrical activation sequence in an open-chest acute canine model of normal atrial function in 8 mongrel dogs under general anesthesia. Bipolar plunge electrodes were distributed over the surface of the atria during unifocal pacing, and intracardiac activation sequence was observed. SN pacing resulted in near-simultaneous activation at midline sites (BBR and CSO); the left atrium (LA) was activated by anterior and posterior wavefronts simultaneously propagating septally to laterally and meeting at the low-lateral perimitral LA. Right atrial appendage (RAA) pacing created intra-RA conduction delay and delayed onset of LA activation. Pacing from RAA, CSO, and BBR resulted in nonsimultaneous activation at midline sites and produced an anteroposterior gradient of LA activation. This phenomenon was seen to the greatest degree with midline pacing and shifted the site of latest activation away from the low-lateral perimitral LA in all pacing configurations except SN pacing.Pacing-induced intra-LA activation dispersion is enhanced with midline atrial pacing, and secondarily shifts the site of latest activation away from the lateral mitral annulus. Measuring atrial activation times to the low-lateral perimitral LA can underestimate the degree of atrial dyssynchrony and be misinterpreted as atrial synchrony. Establishing clinical impact requires evaluation of human data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=pmid________::27349256692273a30da38c6a04bf4871 https://pubmed.ncbi.nlm.nih.gov/25132197 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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