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좋은 시력을 가진 특발성 망막앞막의 수술결과

Surgical Outcomes of Idiopathic Epiretinal Membrane with Good Visual Acuity

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목적: 특발성 망막앞막의 조기 수술에 대한 타당성을 알아보기 위해 좋은 시력을 가진 특발성 망막앞막 환자의 수술결과에 대해 알아보고자 하였다. 대상과 방법: 특발성 망막앞막으로 유리체절제술과 막제거술을 시행 받고 12개월 이상 경과관찰이 가능하였던 환자 중 수술 전 최대교정시력(logMAR)이 0.3 이하인 환자들을 후향적으로 분석하였다. 의무기록과 빛간섭단층촬영 영상을 통해 최대교정시력, 변시증, 중심망막두께, 중심오목형태, 시세포 내절/외절의 상태의 변화를 조사하였다. 결과: 대상환자는 총 24명, 24안이었다. 평균최대교정시력은 수술 전 0.26 ± 0.06에서, 수술 후 12개월 0.25 ± 0.19로 유의한 변화는없었다. 2줄 이상의 시력 호전 및 저하된 경우는 각각 6안씩 있었다. 변시증을 호소한 4안은 수술 후 12개월까지 모두 증상이 남았다. 평균 중심망막두께는 수술 전 418 ± 86 μm에서, 수술 후 6개월 334 ± 45 μm, 12개월 343 ± 45 μm로 유의한 감소를 보였다(p<0.01). 중심오목이 없었던 17안 중 11안(64.7%)에서 평균 6.6 ± 2.6개월 뒤에 중심오목이 회복되었으며, 시세포 내절/외절은 수술 전 정상형19안, 감쇄형 3안, 단절형 2안에서 수술 후 12개월에 정상형 20안, 감쇄형 2안, 단절형 2안으로 의미있는 변화는 없었다. 결론: 좋은 시력의 특발성 망막앞막 환자에서 막제거술은 황반부의 해부학적인 호전을 얻을 수 있었으나 시력의 호전은 없었다. 일부에서는 시력이 저하되는 경우도 있었으므로 좋은 시력을 가진 특발성 망막앞막 환자에서 조기수술은 신중히 결정해야 하겠다.

Abstract

Purpose: To evaluate surgical outcomes of idiopathic epiretinal membrane (ERM) with good visual acuity. Methods: We evaluated patients who were diagnosed with idiopathic ERM with best corrected visual acuity (BCVA) greater than20/40 and who were followed-up for 12 months or longer after vitrectomy and membrane removal. BCVA, metamorphopsia, centralsubfield macular thickness (CSMT), foveal contour, and status of photoreceptor inner/outer segment (IS/OS) junction wereretrospectively assessed based on the medical records and optical coherence tomography (OCT) images. Results: Twenty-four eyes were included in the present study. The mean BCVA (log MAR) did not significantly improve frombaseline to 12 months after surgery (0.26 ± 0.06 and 0.25 ± 0.19, respectively). Six eyes showed improved vision of two or morelines, and six eyes had decreased vision of two or more lines. Metamorphopsia remained in all four eyes with preoperative symptomsuntil 12 months postoperatively. CSMT decreased significantly from 418 ± 86 μm at baseline to 343 ± 45 μm at 12 months(p < 0.01). Among 17 eyes without foveal depression at baseline, 11 eyes recovered a foveal depression at an average of 6.6months after surgery. IS/OS status at baseline was intact in 19 eyes, attenuated in three eyes, and disrupted in two eyes and didnot change significantly at 12 months. Conclusions: Surgical treatment for idiopathic ERM with good visual acuity resulted in anatomical but not functionalimprovement. Choosing surgery for idiopathic ERM with good visual acuity should be considered carefully because decreasedvisual acuity could result in some patients.

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