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首页> 外文期刊>Circulation journal >Influence of Autonomic Stimulation on the Genesis of Atrial Fibrillation in Remodeled Canine Atria not the Same as in Normal Atria
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Influence of Autonomic Stimulation on the Genesis of Atrial Fibrillation in Remodeled Canine Atria not the Same as in Normal Atria

机译:自主神经刺激对重塑犬心房房颤发生的影响与正常心房不同

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Background: The role of autonomic effects in the occurrence and maintenance of atrial fibrillation (AF) has undergone little investigation in the remodeling heart.Methods and Results: In the present study, 2 groups were studied: those with complete atrioventricular block (AVB) produced by radiofrequency current application (AVB dogs, n=17) and those not undergoing AVB (sham dogs, n=5). Eight weeks after creation of AVB, electrophysiologic study, including pulmonary vein (PV) pacing for AF induction, was performed under vagal nerve stimulation (VNS) and sympathetic stimulation (SS) in both groups. After 8 weeks, atria] dimensions and the percentage of fibrosis in the atria were significantly greater in the AVB dogs. In AVB dogs, atrial and PV effective refractory periods were shorter (P<0.01), and atrial conduction velocity increased (P=0.01) during SS, but not during VNS. Inducibility of AF increased only during SS in the AVB dogs (sustained AF: control 7%, SS 60%; P=0.005), whereas it increased only during VNS in the sham dogs. Conclusions: In the remodeled atria, sympathetic stimulation was crucial for the genesis of AF, which is completely different from the condition in normal atria.
机译:背景:在重塑心脏方面,自主神经功能在房颤的发生和维持中的作用尚未得到研究。方法和结果:本研究分为两组:产生完全房室传导阻滞的组通过射频电流施加(AVB狗,n = 17)和未进行AVB的那些(假狗,n = 5)。两组均在迷走神经刺激(VNS)和交感神经刺激(SS)下进行,在创建AVB八周后,进行了电生理研究,包括肺静脉起搏以诱发房颤。 8周后,AVB狗的心房尺寸和心房纤维化百分比明显增加。在AV犬中,SS期间的心房和PV有效不应期较短(P <0.01),而心房传导速度增加(P = 0.01),而在VNS期间则没有。 AF诱导仅在AVB犬的SS期间增加(持续AF:对照7%,SS 60%; P = 0.005),而仅在VNS期间在假犬中增加。结论:在重塑的心房中,交感神经刺激对房颤的发生至关重要,这与正常心房的情况完全不同。

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