Update on Bayés’ syndrome: the association between an interatrial block and supraventricular arrhythmias

Bayés’ Syndrome—A Comprehensive Short Review

“…IAB is common in patients with heart failure and these patients have more frequently new-onset AF, ischemic stroke, higher hospitalization and mortality rates. In patients with valvular heart disease requiring surgery, advanced IAB was independently associated with postoperative AF [17].…”

“…IAB has been proposed as a marker of the structurally altered and electromechanically dysfunctional LA, and, at the same time, as an electrophysiological risk factor and substrate for AF and conditions related to AF, such as congestive heart failure [15,16]. It is important to mention that interatrial dyssynchrony caused by IAB, beyond generating atrial remodeling (increased atrial pressure, atrial dilation and atrial fibrosis), produces endothelial dysfunction, contributing via both factors to enhanced local thrombogenesis, responsible for cardioembolic events [17].…”

“…This method has the disadvantage of high cost, the need for a high level of experience and the low availability for current clinical practice [19]. 3D reconstruction of 3T late gadolinium enhancement CMR allows visualization of atrial fibrosis in patients with IAB, showing the involvement of the upper part of the septum, where the BB is situated [17].…”

“…The amount of fibrosis identified by these techniques is strongly associated with AF recurrence after pulmonary vein isolation. On the other hand, a larger amount of fibrosis induced at the ablation sites equals a better isolation of the AF foci and less chance of recurrence [17].…”

Interatrial block

“…Для изучения отдаленного прогноза при наличии далеко зашедшей блокады и возможного ответа на вопрос о назначении антикоагулянтов был инициирован проспективный регистр, который получил название «Байес регистр» [54]. Планируется включить в регистр более 600 пациентов старше 70 лет на синусовом ритме со структурными изменениями сердца (толщина межжелудочковой перегородки более 12 мм или снижение фракции выброса менее 45% или диаметр левого предсердия больше 45 мм) и разделить их на три группы: с нормальной длиной волны Р, с частичной межпредсердной блокадой и с далеко зашедшей межпредсердной блокадой.…”