左心室扩张功能障碍限制了最大静脉弹性作为收缩功能的指数的使用
1Department of Medicine (Cardiology), Medical University of South Carolina, Charleston 29425.
Circulation
|February 1, 1991
概括
最大缩弹性 (Emax) 可能不会准确地反映左心室 (LV) 收缩功能下降,当腹功能障碍存在时. 这项研究强调了与Emax一起考虑透气压的重要性,以全面评估心脏健康.
科学领域:
- 心血管生理学心血管生理学
- 心脏机械学 心脏机械学
- 心脏衰竭研究研究
背景情况:
- 左心室 (LV) 收缩功能对于维持心脏输出至关重要.
- 最大缩弹性 (Emax) 是LV收缩性的一个关键指标.
- 透缩功能障碍可以与缩性损伤并存,并可能掩盖缩性损伤.
研究的目的:
- 为了调查Emax是否能准确地检测在透缩功能存在的情况下,LV收缩功能下降.
- 评估缺血-再输液损伤对Emax和在正常和过度缩的狗心脏中扩张功能的影响.
主要方法:
- 使用隔离的输血犬类心脏器件进行异体体LV研究.
- 通过全球性缺血 (60或90分钟) 诱导的收缩功能障碍,然后再输血.
- 在正常心脏和压力过载心脏中评估了LV压力,压力体积面积,心肌ATP水平和Emax.
主要成果:
- 在所有组中,缺血-再输液显著降低了发育的压力,压力体积面积和ATP水平.
- 在正常的心脏中,随着透气压的维持,Emax在60分钟的缺血后显著下降.
- 在心脏中,心压升高 (90分钟缺血或补偿性缩),Emax没有显著变化,这表明潜在的掩盖效应.
结论:
- 在存在透缩功能障碍时,Emax可能无法检测到受损的LV收缩性.
- 升高的 LV 透气压力可能会混 Emax 的解释,因为它是缩功能的唯一指标.
- 综合性评估包括透析参数是必要的,以评估缺血性损伤后的LV功能.
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