概括
即使是像iohexol这样的非离子对比剂在血管造影期间也显著降低了冠状动脉血流和心肌功能. 减少的程度取决于注射剂量和速率,影响诊断的准确性.
科学领域:
- 心血管生理学心血管生理学
- 放射学 放射学是一门学科.
- 药理学 药理学是指药理学的学科.
背景情况:
- 通过放射学测量冠状动脉血流量,需要注入对比物质,这可能会改变流动动力学.
- 假设与离子剂相比,非离子对比剂对冠状动脉血流的影响最小.
研究的目的:
- 调查iohexol,一种非离子对比剂,对狗冠状动脉血流和区域心肌功能的影响.
- 建立对比剂量,注射速率及其对冠状动力学和心脏功能的影响之间的关系.
主要方法:
- 六只狗用电磁流探测器和超声波晶体进行仪器仪表.
- 冠心内注射的IOHEXOL (300mg/ml) 用于不同的体积 (2和4毫升) 和速度 (1,3,和4毫升/秒).
- 测量了冠状动脉流量和区域性心肌功能 (分数缩短).
主要成果:
- 伊奥赫索尔注射显著降低了冠状动脉流量 (31-77%) 和心肌小部分缩短 (19-29%).
- 流量减少是剂量依赖的,而流量减少的开始是取决于速率的.
- 与流量变化相比,心肌功能障碍延迟,并且在注射速度较慢时更加明显,表明长期缺血.
结论:
- 像iohexol这样的非离子对比剂显著改变冠状动脉血流和心肌功能.
- 对比剂的剂量和注射速率都是影响这些血液动力学变化的关键因素.
- 输液速度较慢会加剧心肌功能障碍,这凸显了在对比度增强的心脏成像中优化注射参数的重要性.
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