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Cardiac Magnetic Resonance Imaging at 7 Tesla
Published on: January 6, 2019
由电磁场所赋予的心肌保护
A L DiCarlo1, J M Farrell, T A Litovitz
1Vitreous State Laboratories, Catholic University of America, Washington, DC 20064, USA.
Circulation
|February 17, 1999
概括
暴露于电磁场 (EM) 显著保护了小胚胎免受无氧. 这种大热效应表明,电磁场可能会提供对人类心肌损伤的非侵入性保护.
科学领域:
- 心血管生理学心血管生理学
- 电磁生物学 电磁生物学
- 细胞应激反应的应激反应
背景情况:
- 众所周知,电磁场可以在体外诱导应激蛋白.
- 这些压力蛋白质在缺血/再输液的恢复中发挥作用.
- 这项研究调查了EM场是否可以激活体内应激反应,并保护心脏组织免受无氧.
研究的目的:
- 为了确定电磁场 (EM) 是否可以在体内诱导保护性应激反应.
- 评估EM场在无氧期间对心肌组织的保护作用.
- 研究电磁场作为一种减少心脏损伤的非侵入性方法的潜力.
主要方法:
- 胚胎被暴露在60Hz的电磁场中,频率不同,强度不同 (4-10微T),持续20分钟.
- 暴露后,胚胎经历了一小时的休息期,然后被放置在无氧室中.
- 在重新氧化后评估了生存率,对照组和预先治疗过热或EM噪声场的组也被分析. 对温度变化进行了监测.
主要成果:
- 在无氧期间,EM场暴露显著增加了胚胎存活率 (68.7%,对照组为39.6%,P<0.0001).
- 仅使用60Hz,8μT电磁场进行预处理就产生了高生存率 (69%),而高热度 (57.6%) 和电磁噪声 (41.5%) 的保护性较低.
- 在暴露在电磁场中的胚胎中没有检测到温度升高,这证实了无热效应.
结论:
- 无热电磁场 (EM) 暴露有效诱导应激反应,保护胚胎心肌免受无氧.
- 这些发现表明,电磁场暴露可能是一个有价值的非侵入性策略,以减轻心肌损伤.
- 潜在的应用包括在手术,移植或人类急性心肌梗塞期间最大限度地减少心脏损伤.
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