在需求性缺血期间增加透析室刚度:对快速长度变化的反应区分了刚度激活与激活的张力
N Varma1, F R Eberli, C S Apstein
1Cardiac Muscle Research Laboratory, Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA 02118, USA.
Circulation
|May 10, 2000
概括
腹腔硬度在心痛期间增加,原因是刚度,而不是. 这项针对子心脏的研究揭示了高能量酸盐耗尽是需求缺血期间这种刚性力的可能原因.
科学领域:
- 心血管生理学心血管生理学
- 心脏的新陈代谢.
- 心肌缺血研究 肌肉缺血研究
背景情况:
- 在心痛 (需求缺血症) 期间扩张性腔硬度 (DCS) 的增加被认为源于肌细胞的升高.
- 了解缺血期间DCS的精确机制对于治疗缺血性心脏病至关重要.
研究的目的:
- 调查需求缺血期间增加DCS的潜在机制.
- 要区分依赖和严格介导的DCS贡献.
主要方法:
- 在隔离的子心脏中,通过节奏性心动减速和降低冠状动脉血流来诱导需求缺血.
- 使用快速伸展释放 (QSR) 机动来评估DCS机制.
- 验证了QSR在区分驱动和严格介导DCS方面的有效性.
主要成果:
- 需求缺血增加了DCS,由左心室末端透气压 (LVEDP) 的上升证明.
- 在缺血期间的QSR机动将DCS降低到基线水平,表明一种严格介导的机制.
- 在缺血状态下,在QSR期间没有观察到产生的张力成分.
结论:
- 刚性力,可能是由于高能酸盐耗尽或ADP增加,是全球左心室需求缺血症模型中增加DCS的主要驱动因素.
- 这些发现挑战了普遍的假设,即肌细胞的增加是心痛期间DCS的唯一原因.
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