단안 선택적 레이저섬유주성형술에서 안압 변동을 보정한 성공예측인자의 분석
Predictors of Success of Selective Laser Trabeculoplasty Adjusted for Intraocular Pressure Variations
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목적: 선택적 레이저섬유주성형술(selective laser trabeculoplaty, SLT)을 시행 받은 개방각녹내장 환자에서 치료받지 않은 반대안의 안압을 보정하여 SLT의 안압하강 효과 및 성공예측인자를 분석하고자 하였다. 대상과 방법: 단안에 SLT를 시행 받고 1년 이상 관찰한 개방각녹내장 환자 52명 52안을 후향적으로 분석하였다. 시술 전, 시술 후 1, 2, 3개월, 이후 3개월마다 안압을 측정하였다. 시술 후 안압은 치료받지 않은 반대안의 안압변화량으로 보정하여 계산하였다. SLT의 성공은 시술 전 안압보다 20% 이상 감소한 경우로 정의하였다. Kaplan-Meier 생존분석을 이용하여 성공률을 산출하였고, 성공예측인자를 분석하였다. 결과: 시술 전 평균 안압은 23.17 ± 6.96 mmHg, 시술 후 1년째 평균 안압하강은 5.59 ± 4.78 mmHg (29.7%)였으며, 반대안 안압을 보정한 안압하강은 4.70 ± 4.67 mmHg (23.9%)였다. SLT의 성공률은 65.4%, 반대안 안압을 보정한 성공률은 53.9%였다. 시술 전 안압만이 SLT 성공과 유의한 상관관계를 보였고, 시술 전 안압이 높을수록 시술 후 안압하강이 크게 나타났다(p=0.025). 나이와 시야검사의 mean deviation은 SLT 성공과 유의한 상관관계가 없었다(p=0.066, p=0.464). 결론: 개방각녹내장 환자에서 SLT는 안전하고 효과적인 치료 방법이며, 시술 전 안압만이 SLT의 성공과 유의한 상관관계를 보였다. 정확한 치료 효과 분석을 위하여 반대안의 안압 변동을 고려하여야 하겠다.
Abstract
Purpose: To investigate the efficacy, and identify predictors of success of selective laser trabeculoplasty (SLT) in open-angle glaucoma (OAG) patients after adjusting for intraocular pressure (IOP) changes in the untreated fellow eye. Methods: This retrospective chart review included 52 eyes of 52 OAG patients who underwent SLT in one eye and were followed- up for at least 1 year after the procedure. The IOP was measured before the treatment, at 1, 2, and 3 months posttreatment, and every 3 months thereafter. To account for the possible influence of IOP fluctuations on laser outcomes, post-laser IOP values of the treated eye of each patient were also analyzed, after adjusting for IOP changes in the untreated fellow eye. Success was defined as an IOP decrease ≥20% of the pretreatment IOP. The success rate was determined based on Kaplan-Meier survival analysis and factors predictive of success were analyzed using the Cox proportional hazard model. Results: The mean pretreatment IOP was 23.17 ± 6.96 mmHg. The mean IOP reduction was 5.59 ± 4.78 mmHg (29.7%) and the success rate was 65.4% at 1 year. The adjusted mean IOP reduction was 4.70 ± 4.67 mmHg (23.9%) and the adjusted success rate was 53.9%. Pretreatment IOP was associated with SLT success; the higher the pretreatment IOP, the greater the post-laser IOP reduction (p = 0.025). Age and mean deviation index did not show a significant association with SLT success (p = 0.066 and p = 0.464, respectively). Conclusions: SLT is a safe and effective alternative method of IOP reduction in OAG patients. Herein, pretreatment IOP was the only factor significantly associated with SLT success. IOP fluctuations of the untreated eye should be considered for a better understanding of the impact of treatment.
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