内皮素—1与脑血管痉挛缺血性脑损害的关系及银杏叶制？…

目的：探讨内皮素－１（ｅｎｄｏｔｈｅｌｉｎ－１，ＥＴ－１）与蛛网膜下腔出血（ｓｕｂａｒａｃｈｎｏｉｄ ｈｅｍｏｒｒｈａｇｅ，ＳＡＨ）后缺血性脑损害的关系和银杏叶制剂（ｇｉｎｋｇｏ ｂｉｌｏｂａ ｅｘｔｒａｃｔ，ＧＢＥ）的防治作用。方法：应用非开颅大鼠模型，对ＳＡＨ组和ＧＢＥ组测量基底动脉（ｂａｓｉｌａｒ ａｒｔｅｒｙ，ＢＡ）管径并观察２４ｈ内微区脑血流量（ｒｅｇｉｏｎａｌ ｃｅｒｅｂｒａｌ ｂｌｏ

Relationship between endothelin-1 and ischemic brain damage after subarachnoid hemorrhage and protective effect of Ginkgo biloba extract]

OBJECTIVE: To investigate the role of endothelin-1 (ET-1) in development of ischemic brain damage after subarachnoid hemorrhage (SAH), and the protective effect of Ginkgo biloba extract (GBE). METHODS: Wistar rat noncraniotomy models of SAH were divided into SAH group and GBE treated group, the diameter of basilar artery (BA) and dynamic changes of regional cerebral blood flow (rCBF) and ET-1 content of intracranial plasma within 24 hours after SAH of both groups were determined. And pathological examination of CA1 region of hippocampus was performed 3 days later. RESULTS: rCBF decreased and ET-1 content increased obviously and retained in 24 hours after SAH. Spasm of BA occurred half an hour after SAH and neurons of hippocampus CA1 region was damaged severely. GBE could antagonize the above-mentioned pathological changes effectively. CONCLUSION: Increase of ET-1 is an important factor leading to ischemic brain damage after SAH. GBE exerts its protective effect by antagonizing pathological increase of ET-1.