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題 名 | Effects of Raised Intraocular Pressure on Optic nerve Head Circulation in New Zealand White Rabbit-Laser Doppler Flowmetry Study=眼壓對紐西蘭白兔視神經盤血流之影響--雷射都卜勒血流計實驗 |
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作 者 | 周秉義; 李驊; | 書刊名 | 中華民國眼科醫學會雜誌 |
卷 期 | 35:2 1996.06[民85.06] |
頁 次 | 頁31-36 |
分類號 | 416.73 |
關鍵詞 | 眼壓; 紐西蘭; 白兔; 視神經盤; 血流; 雷射都卜勒血流計; Optic nerve; Laser doppler flowmetry; Intraocular pressure; |
語 文 | 英文(English) |
中文摘要 | 目的:雷射都F勒血流計為一種測量血液流速、體積和血流量的方法。本 研究藉雷射都F勒血流計測量眼壓改變對於紐西蘭白兔視神經盤血流之影響,並 證實自主調節的存在。方法:本研充以十隻紐西蘭白兔為實驗對象。在全身麻醉 下,以立體固定儀固定頭部。於動靜脈插管,眼內插管以後,同步測量血壓,眼 壓及肛溫。眼壓經由針筒幫浦(syringe pump,Orion34IB)控制,每IOmmHg調升/ 降一吹。經由雷射都F勒血流儀(PerimedPF3)測量眼壓政變對於視神經盤血流量及 體積之影響。雷射光照射在規神經盤不同的部位,並避開較大的血管。結果:當 雷射光照射在視神經盤緣,且灌注壓在53.1mmHg(42.7-57.7mmHg)以上時,血流量 維持不變,而體積則隨灌注壓下降而下降。當灌注壓小於53.1mmHg時,血流量 及體積均隨灌注壓下降而減少。此一結果顯示,眼壓對於視神經盤有重要影響, 且在某一特定壓力以內,視神經盤血流有自主調節作用的存在。本研究模式之建 立,有助於探討青光眼的病理機轉,並可更進一步研究藥物,腦壓等因素對視神 經盤血流的作用。 |
英文摘要 | Purpose: To evaluate the effect of intraocular pressure on optic nervehead (ONH) blood flow and demonstrate the existence of an autoregulatoryresponse of the ONH circulation. Methods: Ten rabbits weighing 2.0-3.0 Kg were used. Under generalanesthesia, each rabbit was fixed on the stereotactic table. Blood pressure,rectal temperature, and intraocular pressure (IOP) were monitoredcontinuously. The IOP was controlled by a syringe pump and increasedgradually in a stepwise pattern (10 mmHg in each scale). By means of alaser Doppler blood flowmetry (Perimed PF3), the blood cell flux (F), andconcentration of moving blood cells (CMBC) were recorded simultaneously.The laser beam was focused on the inner disc margin away from majorvessels when the fundus was observed by indirect ophthalmoscopy. Results: When the perfusion pressure (PP) was higher than a criticalpressure (42.7-55.7 mmHg, mean 53.1 mmHg), F was maintained at aconstant level at which time CMBC decreased in proportion to PP. Whenthe PP decreased to the critical pressure, P and CMBC dropped linearlywith PP. This phenomenon demonstrated the autoregulatory ability of theONH that existed only within limited perfusion pressure range under a criticalIOP. |
本系統中英文摘要資訊取自各篇刊載內容。