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要約 背景:塩酸ドネペジルはアルツハイマー病に有効であるとされ,アセチルコリンの脳内濃度を高めて認知機能を改善し,脳血流維持の効果がある。正常眼圧緑内障患者の一部に,アルツハイマー病型の脳血流分布があることを筆者らは報告した。目的:正常眼圧緑内障に対する塩酸ドネペジルの効果の報告。対象と方法:123I-IMP SPECTによりアルツハイマー病型の脳内血流低下がある正常眼圧緑内障5例10眼を対象とした。男性3例,女性2例で,年齢は64~79歳(平均69歳)である。塩酸ドネペジル5mg/日を6か月間投与し,通常の眼科的検査のほかレーザースペックル法により乳頭血流を測定した。結果:投与前と比較し,投与6か月後に乳頭血流と脳血流が有意に増加し,Humphrey視野MD値が5眼(50%)で改善した。眼圧は不変であった。結論:塩酸ドネペジルの全身投与は,神経保護的な作用を通じ正常眼圧緑内障での視神経症に有効である可能性がある。
Abstract. Background:Peroral donepezil hydrochloride is claimed to be effective for Alzheimer disease, by elevating concentration of acetylcholine in the brain resulting in improved recognition and intracerebral circulation. It has been reported that some cases of normal-tension glaucoma(NTG)show cerebral circulation similar to patients of Alzheimer disease. Purpose:To evaluate the effect of donepezil hydrochloride on NTG. Cases and Method:This study was made on 10 eyes of 5 NTG patients who showed cerebral circulation similar to Alzheimer disease by 123I-IMP SPECT. The series comprised 3 males and 2 females. Their age ranged from 64 to 79 years, average 69 years. They were given donepezil hydrochloride at the daily dosis of 5mg for 6 months. Circulation in the optic nervehead was measured by laser speckle flowmetry. Results:Circulation in the brain and optic nervehead significantly increased after 6 months of treatment. MD value by Humphrey tonometer improved in 5 eyes(50%). There was no change in intraocular pressure. Conclusion:Peroral donepezil hydrochloride may improve optic neuropathy in NTG through its neuroprotective action.
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