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育亨宾对异丙酚麻醉中大鼠海马去甲基肾上腺素释放的影响

毕业论文

摘要:

目的:观察大鼠异丙酚麻醉与中枢神经系统海马去甲基肾上腺素(NA)的释放以及α2-NA受体抑制剂之间的相互关系,探讨中枢性NA机制在异丙酚麻醉中发生的作用。
  方法:选择20只雄性SD大鼠,随机分为A,B2组,每组10只。A组:微量泵以10mg/kg/h,60mg/kg/h的速度依次各静注45min,停止静注异丙酚直至动物清醒。B组在输注异丙酚的同时腹腔内注射育亨宾0.5mg/kg,余和A组相同。采用微透析技术分别测定异丙酚麻醉前、中及苏醒期的大鼠海马区细胞外液的NA释放值。
  结果:A组和B组,NA的释放在整个麻醉过程中的变化趋势有显著差异(P<0.05)。其中B组的'NA的释放量在整个麻醉过程中的变化波动较大并呈升高的趋势,最高为(0.19±0.02)μg/15min,最低为(0.13±0.03)μg/15min;而A组NA的释放量在整个麻醉过程中的变化则较平稳,最高为(0.16±0.01)μg/15min,最低(0.14±0.02)μg/15min。
  结论:异丙酚麻醉抑制海马区NA的释放,育亨宾可使此作用减弱。
  关键词:海马;脑;微透析;异丙酚;育亨宾;去甲基肾上腺素;大鼠
  本文作者:贺赛琳,张英民,岳 云,陈小光,郭 徽,刘 苏

育亨宾对异丙酚麻醉中大鼠海马去甲基肾上腺素释放的影响

Effects of propofol anesthesia on noradrenaline release in rat hippocampus

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贺赛琳1,张英民1,岳 云2,陈小光1,郭 徽1,刘 苏1

(1解放军304医院麻醉科,北京100037,2首都医科大学附属红10字朝阳医院麻醉科,北京100021)

HE Sai-Lin1, ZHANG Ying-Min1, YUE Yun2, CHEN Xiao-Guang1, GUO Hui1, LIU Su1

1Department of Anesthesiology, 304th Hospital of Chinese PLA, Beijing 100037, China, 2Department of Anesthesiology, Chaoyang Hospital, Capital Medical Science University, Beijing 100021, China

 

Abstract

Aim: To observe the influence s of propofol anesthesia on the release of noradrenaline (NA) andα2-NA receptorinhibitor yohimbine in rat hippocampus so as to identify themechanisms of central noradrenaline in propofol anesthesia.

Methods: Twenty adult male SD rats were divided randomly into 2 groups. In group A ,  the rats were infused intravenously(IV) with propofol at a rate of 10 mg/kg/h for 45 min and 60mg/kg/h for 45 min and in group B ,  the rats were givenyohimbine 0.5 mg/kg intraperitoneally and were infused IV withpropofol a s did group A. The release of NA in the extra-cellularliquid of hippocampus was quantified before propofol anesthesia, in propofol administration and after propofol administrationby in vivo microdialysis technique.

Results: Compared with those of the group A, the NA levels in hippocampus of group Bchanged significantly during the whole anesthesia course ,  with the highest release being(0.19±0.02)μg/15min and the lowest release being(0.13±0.03)μg/15min. The NA levelsin group A changed steadily [from(0.16±0.01)μg/15min to(0.14±0.02)μg/15min],  (P<0.05).

Conclusion: Propofol anesthesia can inhibit the NA release in hippocampus but yohimbine increases NA release in hippocampus in propofol anesthesia.

Keywords: hippocampus; brain; microdialysis; propofol; yohimbine; noradrenaline; rat

 

0 引言

去甲基肾上腺素(NA)是中枢神经系统(CNS)重要的神经递质,测定某脑区NA释放的变化可以反映脑内单胺类神经递质代谢的状态。α2-NA受体在大脑皮层、脑干的蓝斑核(LC)、海马、孤束核等处分布的密度很高。其生理功能与维持CNS觉醒有关,可能与全麻药中枢作用机制有1定联系。我们应用脑内微透析技术,观察大鼠异丙酚麻醉及其在NA特定拮抗剂作用下与CNS海马NA的释放以及α2-NA受体之间的相互关系如下。

摘要:

目的:观察大鼠异丙酚麻醉与中枢神经系统海马去甲基肾上腺素(NA)的释放以及α2-NA受体抑制剂之间的相互关系,探讨中枢性NA机制在异丙酚麻醉中发生的作用。
  方法:选择20只雄性SD大鼠,随机分为A,B2组,每组10只。A组:微量泵以10mg/kg/h,60mg/kg/h的速度依次各静注45min,停止静注异丙酚直至动物清醒。B组在输注异丙酚的同时腹腔内注射育亨宾0.5mg/kg,余和A组相同。采用微透析技术分别测定异丙酚麻醉前、中及苏醒期的大鼠海马区细胞外液的NA释放值。
  结果:A组和B组,NA的释放在整个麻醉过程中的变化趋势有显著差异(P<0.05)。其中B组的NA的释放量在整个麻醉过程中的变化波动较大并呈升高的趋势,最高为(0.19±0.02)μg/15min,最低为(0.13±0.03)μg/15min;而A组NA的释放量在整个麻醉过程中的变化则较平稳,最高为(0.16±0.01)μg/15min,最低(0.14±0.02)μg/15min。
  结论:异丙酚麻醉抑制海马区NA的释放,育亨宾可使此作用减弱。
  关键词:海马;脑;微透析;异丙酚;育亨宾;去甲基肾上腺素;大鼠
  本文作者:贺赛琳,张英民,岳 云,陈小光,

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