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年龄对正常冠状动脉患者微血管功能的影响
Tijn P J Jansen1, Caïa Crooijmans1, Nico Pijls2
1Department of Cardiology, Radboud University Medical Centre, Nijmegen, the Netherlands.
概括
衰老会损害冠状动脉微血管功能,导致阻力增加和流量储备减少,即使没有动脉样硬化. 这种微血管抵抗储备 (MRR) 的年龄相关下降影响了冠状动脉微血管功能障碍 (CMD) 患者和没有冠状动脉微血管功能障碍 (CMD) 的患者.
科学领域:
- 心脏病学 心脏病学
- 血管生理学 血管生理学
- 老年学是一门学科.
背景情况:
- 冠状动脉微血管功能可能会随着年龄的增长而下降,独立于心表动脉样硬化.
- 了解微血管功能的与年龄相关的变化对于心血管健康至关重要.
- 没有阻塞性冠状动脉疾病 (ANOCA) 的心痛提供了研究微血管功能的模型.
研究的目的:
- 量化评估衰老对冠状动脉微血管功能的影响.
- 研究 ANOCA 患者的年龄和心肌血流,微血管抵抗和冠状动脉流量储备之间的关系.
- 确定与年龄相关的微血管变化是否与冠状动脉微血管功能障碍 (CMD) 有关.
主要方法:
- 连续热稀释方法用于评估314名ANOCA患者的微循环功能.
- 与年龄相关的静止和高血压心肌动脉血流量 (Q),微血管阻力 (Rmicro),冠状动脉流量储备 (CFR) 和微血管阻力储备 (MRR) 的分析.
- 患者分为三个年龄组 (≤52,53-64,≥65岁) 进行分层,以评估与年龄相关的差异.
主要成果:
- 超高血压的心肌血流量 (Qmax) 呈现出随着年龄的增长而下降的趋势 (p=0.083).
- 高血压的微血管抵抗 (Rmicro,hyp) 随着年龄的增长显著增加 (p=0.005).
- 微血管抵抗储备 (MRR) 随着年龄的增长显著下降 (p=0.038),在患有和没有心血管疾病的患者中都明显.
结论:
- 发生了微血管抵抗和微血管功能下降的年龄相关的生理上升.
- 降低的MRR反映了与年龄相关的微血管功能下降,独立于动脉样硬化.
- 观察到的MRR与年龄相关的下降存在于CMD和没有CMD的患者中,特别明显的是那些冠状动脉光滑的人.
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