边界缺血区的形成取决于的血度
Olesya Bernikova1,2, Aleksandra Durkina1, Mikhail Gonotkov1
1Department of Cardiac Physiology, Institute of Physiology, Komi Science Center, Ural Branch, Russian Academy of Sciences, Syktyvkar, Russia.
细胞外在缺血期间影响心脏电生理学. 较低的水平创造了一个独特的边界区域,在再注射时增加了超性压力.
科学领域:
- 心血管生理学心血管生理学
- 心脏电生理学 心脏电生理学
- 心肌缺血研究 肌肉缺血研究
背景情况:
- 细胞外 ([K+]) 度是影响心脏电生理学的关键因素.
- 心肌中缺血-正常边界区域的电生理学特征在变化[K+]下尚未完全理解.
研究的目的:
- 研究细胞外度 ([K+]) 如何影响缺血性心肌边界区域的脱极化和再极化.
- 确定[K+]变异对缺血-正常边界区域的形成和相关的电生理学异常的影响.
主要方法:
- 在一次急性缺血/再输的小鼠模型中,进行了64个冠心膜映射,并控制了细胞外水平 (2.3-6.4mM).
- 进行了补丁实验,以评估缺氧对不同[K+]的动作潜力持续时间和IK(ATP) 电流的影响.
- 使用线性回归分析将激活-再极化间隔和导电速度与[K+]联系起来.
主要成果:
- 低正常 ([K+] <4.7 mM) 导致一个独特的边界区域,ST段升高,但没有激活延迟.
- 正常高 ([K+]>4.7mM) 消除了过渡边界区域,只留下缺血和正常区域.
- 较低的[K+]与增加的反异位压力负担 (ESB) 和减弱的IK (ATP) 对缺氧的反应有关.
- 缺氧缩短了5.4毫米[K+]的作用电位持续时间,但不是1.3毫米[K+].
结论:
- 在低正常的细胞外中形成边界区域与减弱的IK(ATP) 电流对缺氧的反应有关.
- 在心肌缺血/再输血期间,在低正常的条件下观察到增加的反注射外性负担.
- 细胞外的度显著调节了缺血性心肌中的电生理基质和心律失常潜在.
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