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首页> 外文期刊>Circulation journal >Electrical remodeling of the ventricular myocardium in myocarditis: studies of rat experimental autoimmune myocarditis.
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Electrical remodeling of the ventricular myocardium in myocarditis: studies of rat experimental autoimmune myocarditis.

机译:心肌炎中心室心肌的电重塑:大鼠实验性自身免疫性心肌炎的研究。

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The purpose of this study was to evaluate the electrical remodeling of the ventricular myocardium in the experimental autoimmune myocarditis (EAM) model in Lewis rats. EAM was induced by immunization with cardiac myosin. During the active myocarditis phase, the effective refractory period (ERP), the duration of the monophasic action potential (MAPD) was extracted from the left ventricular free wall, and the mRNA levels of Kv1.4, 4.2, 4.3 and L type Ca2+ channel were determined by RNase protection assays. The inducibility of ventricular arrhythmia was higher in EAM rats than in the control rat, and the direct relationship between the coupling intervals of the premature stimulus and the ventricular arrhythmia in EAM rats. The ERP was prolonged in EAM rats compared with the control group. The MAPDs determined as 20% and 90% repolarization time, were both longer in EAM rats than in the controls. The level of expression of Kv4.2 mRNA was reduced in EAM rats in comparison with the controls, whereas those of Kv1.4, 4.3 and the L type Ca2+ channel were unchanged. Ventricular vulnerability was higher in EAM rats than in the control rats, and some of the ventricular arrhythmias observed in the EAM group seemed to be based on triggered activity. The level of expression of Kv4.2 mRNA was significantly reduced, and this change was compatible with prolongation of the action potential duration.
机译:这项研究的目的是评估Lewis大鼠实验性自身免疫性心肌炎(EAM)模型中心室心肌的电重构。通过用心脏肌球蛋白免疫来诱导EAM。在活动性心肌炎阶段,从左心室游离壁提取有效不应期(ERP),单相动作电位的持续时间(MAPD)以及Kv1.4、4.2、4.3和L型Ca2 +通道的mRNA水平通过RNase保护试验确定。 EAM大鼠的室性心律失常的诱导性高于对照组,并且早搏的耦合间隔与EAM大鼠的室性心律失常的直接关系。与对照组相比,EAM大鼠的ERP延长。在EAM大鼠中,被确定为20%和90%复极化时间的MAPD均比对照组长。与对照组相比,EAM大鼠中Kv4.2 mRNA的表达水平降低,而Kv1.4、4.3和L型Ca2 +通道的表达水平未改变。 EAM大鼠的心室脆弱性高于对照组,EAM组中观察到的一些室性心律失常似乎是基于触发活动。 Kv4.2 mRNA的表达水平显着降低,并且这种变化与动作电位持续时间的延长是相容的。

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