概括
在狗中,施用富含氧气的空气 (FIO2 0.40) 显著降低了心肌梗塞的大小和冠状动脉堵塞后的急性缺血性损伤. 较高的氧气水平降低了死的发展,由酶和组织学评估证实.
科学领域:
- 心血管研究研究心血管研究
- 氧气疗法是一种氧气疗法.
- 肌肉心脏病发作 肌肉心脏病发作
背景情况:
- 心肌梗塞 (MI) 是导致死亡的主要原因.
- 氧气疗法是心血管紧急情况的常见干预措施.
- 不同氧度对心脏病发作大小的确切影响需要进一步阐明.
研究的目的:
- 在实验犬模型中研究富含氧气的空气对心肌梗塞大小的影响.
- 确定增加吸入氧气 (FIO2) 分数是否会减少急性缺血性损伤和随后的心肌缩.
主要方法:
- 胸前电图被用来评估心肌缺血损伤在麻醉的狗遭受冠状动脉封闭.
- 在封闭过程中,狗暴露于不同比例的吸入氧气 (FIO2 0.20和0.40).
- 用心肌肌蛋白酸酶 (CPK) 活性和组织学技术来评估24小时后的心脏病发作的大小.
主要成果:
- 与FIO2 0.20 (P < 0.01) 相比,0.40的FIO2显著降低了ST段的升高和具有显著升高的位点数.
- 在封闭后将FIO2增加到0.40,导致CPK活动不那么抑郁,心脏病发作发病率更低 (49%与100%对照).
- 1.0的FIO2没有进一步减少心肌损伤.
结论:
- 在0.40的FIO2下吸入氧气有效地减少了经过实验冠状动脉封闭后的急性缺血性损伤.
- 用氧气丰富的空气减少心肌亡的最终发展,这是由酶和组织学发现所证明的.
- 这些发现表明,中度高氧症在限制急性心肌缺血期间心脏病发作的大小方面具有治疗益处.
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