概括
在患有冠状动脉狭窄的狗中,冠状动脉窃取发生在二皮里达摩尔,而不是酸甘油中. 这种现象需要动脉扩张器和动脉狭窄,以减少对缺血区域的附带流.
科学领域:
- 心血管生理学心血管生理学
- 药理学 药理学是指药理学的学科.
背景情况:
- 冠状动脉是血管扩张将血流从缺血区域转向的现象.
- 之前的研究表明,二皮里达摩尔可以增加正常冠状动脉中的附带流量.
研究的目的:
- 为了确定血管扩张剂诱导的冠状动脉停止所需的条件.
- 在冠状动脉狭窄的狗模型中研究二皮里达摩尔和酸甘对附带流的作用.
主要方法:
- 被麻醉的狗接受了左前垂下冠状动脉 (LAD) 的绑定.
- 靠近的LAD和左环动脉 (LC) 狭窄了.
- 放射性微球测量了区域性心肌动脉血流.
- 用迪皮里达摩尔和酸甘油来评估它们对流量和心电图学变化 (sigmaST) 的影响.
主要成果:
- 二甲基 (1-1.5毫克/公斤) 降低了向缺血区域的附带流量 (0.19至0.14毫升/分钟/克),并增加了向非缺血区域的流量.
- 这种降低在缺血区域的上心半部分 (0.26到0.14毫升/分钟/克) 最明显,并且与增加的西格玛ST相关.
- 酸甘油 (5微克/千克/分钟) 并没有显著改变附带流或西格玛ST.
结论:
- 血管扩散剂诱导的冠状动脉衰竭需要动脉型扩张器 (如二皮里达摩尔) 和提供附带流动的动脉中的狭窄.
- 盗窃机制很可能是由于压力偏向狭窄的压力下降,降低了附带驱动压力.
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