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Enhanced Susceptibility to Alternans in a Rabbit Model of Chronic Myocardial Infarction

机译:增强对慢性心肌梗死兔模型中的交替的易感性

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The aim of this study is to examine how structural discontinuity and functional remodeling changes the susceptibility to alternans of action potential duration (APD) in a rabbit model of chronic myocardial infarction (MI). Optical mapping experiments using voltage-sensitive dyes were performed in 14 rabbit hearts. We found that (1) APD alternans starts at a significantly slower pacing rate in hearts with MI (n=7) than in normal hearts (n=7), with the original sites of alternans of APD located in the infarct region and infarct adjacent regions. (2) Alternans of activation cycle length (CL) precedes the occurrence of spatially discordant alternans of APD, with the regions of activation CL alternans located in the infarct adjacent regions. Based on these results, we conclude that susceptibility to alternans are significantly enhanced in this rabbit model of chronic MI, and the enhancement is strongly correlated to structural and functional heterogeneity imposed by the infarction.
机译:本研究的目的是检查结构不连续性和功能性重塑如何改变慢性心肌梗死(MI)的兔模型中的动作潜在持续时间(APD)的易感性。使用电压敏感染料的光学映射实验在14只兔心中进行。我们发现(1)APD障碍在MI(n = 7)中以明显慢的节奏速度开始于正常的心(n = 7),与位于梗塞区域和infarct相邻的APD的ACC的原始网站地区。 (2)激活循环长度(CL)的交流在APD的空间不间断间隔的发生之前,具有位于梗塞相邻区域的激活CL的区域。基于这些结果,我们得出结论,在该慢性MI的这种兔模型中对替代的易感性显着增强,并且增强与梗死施加的结构和功能异质性强烈相关。

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