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要約 目的:iStent®挿入による眼圧下降および緑内障薬剤減少効果についての検討。
対象と方法:虎の門病院眼科にて白内障手術併用iStent®挿入術を施行した23例30眼を対象とし,術前眼圧20mmHg以上の術前高眼圧群(17眼),20mmHg未満の術前低眼圧群(13眼)の2群に分けた。両群で眼圧下降・緑内障薬剤減少効果を評価し,併せて生存解析を行った。
結果:平均追跡期間は17.1±9.7か月であった。平均眼圧は術前21.0±4.9mmHg,術後16.1±5.2mmHgであり,有意に減少した(p=0.000036)。眼圧下降幅の中央値は術前高眼圧群7.0mmHg,術前低眼圧群2.3mmHgであり,術前高眼圧群のほうが大きかった。術前後の緑内障薬剤スコアは術前高眼圧群では0.76減少した(p=0.014)が,術前低眼圧群では有意差はなかった(p=0.090)。最終生存率は術前高眼圧群53.8%,術前低眼圧群19.4%であり,2群間に有意差があった(p=0.0054)。術前高眼圧群の3眼で最終的に追加緑内障手術を要した。
結論:iStent®挿入は眼圧下降と緑内障薬剤減少に有用である可能性が示された。術前眼圧が高い症例のほうがiStent®の有効性が高いことが示唆された。
Abstract Purpose:To evaluate the effect of iStent® insertion on lowering intraocular pressure(IOP)and reducing glaucoma medications.
Subjects and methods:Thirty eyes of 23 patients who underwent iStent® insertion combined with cataract surgery at the Department of Ophthalmology, Toranomon Hospital were included. We evaluated reductions of IOP and glaucoma medications in two groups:the high group(17 eyes)with preoperative IOP of 20 mmHg or higher and the low group(13 eyes)with IOP of less than 20 mmHg, and also performed survival analysis.
Results:The mean follow-up period was 17.1±9.7 months. The mean pre- and postoperative IOPs were 21.0±4.9 mmHg and 16.1±5.2 mmHg, respectively, which were significantly different(p=0.000036). The median range of IOP reduction was 7.0 mmHg in the high group and 2.3 mmHg in the low group, respectively. The pre- and postoperative glaucoma drug scores were significantly decreased by 0.76 in the high group(p=0.014)but not in the low group(p=0.090). The percentage of patients who survived at the final follow-up was 53.8% and 19.4% in the high and low groups, respectively, which was significantly different(p=0.0054). Three eyes in the high group required additional glaucoma surgeries.
Conclusions:Insertion of iStent® may be useful in lowering IOP and decreasing glaucoma medications. It is suggested that iStent® is more effective in less advanced glaucoma with higher IOP.
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