Cardioprotection induced by ischemic preconditioning in the mammalian heart: effects on arrhythmogenesis.

Cardioprotection induced by ischemic preconditioning in the mammalian heart: effects on arrhythmogenesis.
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哺乳动物心脏缺血预处理诱导的心脏保护:对心律失常发生的影响。

DOI:
10.1139/y97-025
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发表时间:
1997
影响因子:
2.1
通讯作者:
M. W. Botsford
M. W. Botsford
中科院分区:
医学4区
文献类型:
--
作者:
A. Lukas;M. W. Botsford

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缺血预适应(PC)描述了当短暂的缺血增加心脏对未来较长持续时间的缺血发作的耐受性时发生的保护。这种保护通常通过心肌梗塞面积的减少或收缩功能恢复的改善来衡量。很少有研究测试 PC 是否还能预防严重心律失常的发生,例如室性心动过速 (VT) 和心室颤动 (VF)。我们研究了预适应对 Langendorff 灌注兔心脏心律失常的影响。所有心脏均进行 30 分钟的缺血测试,然后进行再灌注。在测试缺血前 30 分钟,预处理的心脏经历一到四个缺血期(每次 5 分钟,间隔 10 分钟再灌注)。 42% 的非 PC 心脏在缺血期间发生室颤。一个 PC 周期完全抑制 VF(0%;p < 0.05),两个 PC 周期提供部分保护(VF = 17%)。相比之下,接受三个或四个 PC 期的心脏在缺血期间分别有 64% 和 50% 发生颤动。测试缺血诱发了缺血性挛缩,可通过两到三个 PC 周期来预防,但不能通过一或四个 PC 周期来预防。任何 PC 方案均未改善缺血后收缩恢复。总之,我们的数据表明,单次 PC 期可以完全防止兔心脏缺血引起的心室颤动。预处理还可以防止缺血性挛缩的发生。然而,预防心律失常的最佳预处理“剂量”与预防收缩功能障碍的最佳预处理“剂量”不同。
Ischemic preconditioning (PC) describes the protection that occurs when a brief period of ischemia increases the tolerance of the heart to a future ischemic episode of longer duration. This protection is typically measured as a reduction in myocardial infarct size or improved recovery of contractile function. Few studies have tested whether PC also prevents the occurrence of severe arrhythmias, such as ventricular tachycardia (VT) and fibrillation (VF). We studied the effects of preconditioning on arrhythmias in Langendorff-perfused rabbit hearts. All hearts were subjected to a 30-min test ischemia followed by reperfusion. Preconditioned hearts underwent one to four ischemic periods (5 min each, separated by 10 min of reperfusion) 30 min prior to the test ischemia. VF occurred in 42% of non-PC hearts during ischemia. One PC period totally suppressed VF (0%; p < 0.05) and two PC periods provided partial protection (VF = 17%). In contrast, 64 and 50% of hearts receiving three or four PC periods fibrillated during ischemia, respectively. The test ischemia induced an ischemic contracture that was prevented by two or three PC periods, but not one or four PC periods. None of the PC protocols improved postischemic contractile recovery. In conclusion, our data show that a single PC period completely protects against ischemia-induced VF in rabbit hearts. Preconditioning also prevents development of an ischemic contracture. However, the optimal preconditioning "dose" that prevents arrhythmias is not the same as that which protects against contractile dysfunction.
预处理对离体缺血/再灌注大鼠心脏再灌注心律失常、心肌功能、自由基形成和离子迁移的影响。
DOI: --
发表时间: 1994
影响因子: 3
作者:
Tosaki,A;Cordis,GA;Szerdahelyi,P;Engelman,RM;Das,DK
通讯作者: Das,DK
DOI: 10.1006/jmcc.1994.1078
发表时间: 1994-05-01
影响因子: 5
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发表时间: 1994-09
影响因子: 20.1
作者:
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DOI: 10.1172/jci113621
发表时间: 1988-08-01
影响因子: 15.9
作者:
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通讯作者: MCCAY, PB
DOI: 10.1161/01.res.68.1.61
发表时间: 1991-01-01
影响因子: 20.1
作者:
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