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題名 | The Effect of Sphenopalatine Postganglionic Neurotomy on the Alteration of Local Cerebral Blood Flow of Normotensive and Hypertensive Rats in Acute Cold Stress=蝶顎神經節後神經切斷術對正常血壓與高血壓白鼠在急性寒冷環境下局部腦血流之效應 |
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作者 | 王有智; 郭重雄; 林欣榮; | 書刊名 | Proceedings of the National Science Council : Part B, Life Science |
卷期 | 22:3 1998.07[民87.07] |
頁次 | 頁122-128 |
分類號 | 416.291 |
關鍵詞 | 蝶顎神經節後神經切斷術; 高血壓; 局部腦血流; 腦中風; 正常血壓; Sphenopalatine postganglionic neurotomy; Local cerebral blood flow; Cold stress; Normotensive rat; Spontaneous hypertensive rat; |
語文 | 英文(English) |
英文摘要 | The cold season of a year has been reported to have the highest incidence of strokes. Present stud- ies were designed to test whether the parasympathetic denervation plays any role in the regulation of local cerebral blood flow (LCBF) in anesthetized animals exposed to a cold environment. Each species of Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR) was divided into four groups: sphenopalatine postganglionic neurotomy (SPNx) or a control group at room temperature (20OC) or in a cold environment (5OC), respectively. LCBF in 14 brain structures was measured using the [14C] iodoantipyrine technique and tissue dissecting methods. Our results show that SPNx did not significantly alterphysi- ological parameters and LCBF in WKY and SHR kept at either 20OC or 5OC. However, 30 minutes of cold exposure caused a significant decrease in the core body temperature of both the WKY and SHR groups (P < 0.05, Student's paired t-test) and a significant decrease in LCBF in 3 of 14 brain areas: the temporal cortex (TC), inferior colliculus (IC) and vermis (VER) of both WKY and SHR (P <0.05, MANOVA). The percentages of decrease were 24% (TC), 12% (IC), 12% (VER) and 19% (TC), 16% (IC), 15% (VER), respectively. Our findings indicate that in a cold environment, the lower LCBFs in some areas of the brain may be related to decreased body temperature. Whether they are related to the higher prevalence of stroke in winter needs further investigation. |
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