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혈장응고효소 양성 여부에 따른 포도알균 각막염의 임상 분석

Clinical Analysis of Staphylococcus Keratitis According to Coagulase Positivity

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목적: 포도알균 각막염을 혈장응고효소 유무에 따라 두 군(coagulase negative Staphylococcus [CNS], coagulase positive Staphylococcus [CPS])으로 나누어 임상분석을 시행하였다. 대상과 방법: 영남대학교병원에서 20년간(1998-2017) 입원 치료한 감염각막염 환자 중 배양검사에서 포도알균이 동정된 138안(CNS 94안, CPS 44안)을 대상으로 두 군 간의 역학, 선행인자, 임상양상, 항생제 감수성 및 치료 결과를 비교 분석하였다. 불량한 임상결과는 최종교정시력 0.1 미만, 치료 후 시력저하, 합병증 발생, 수술 치료 중 하나 이상 해당되는 경우로 정의하였으며, 그 위험인자는 전체 군을 기준으로 다변량분석을 통해 분석하였다. 결과: 가장 흔한 선행인자로 CNS는 각막외상(47.9%), CPS는 안구표면질환(31.8%)이었다. 두 군 간의 평균 연령, 성별, 안구표면질환, 상피결손 크기 및 전방축농은 차이가 없었다. 메티실린 감수성은 CNS에서 유의하게 낮았으며(39.4%:72.7%, p<0.001), 불량한 임상결과는 CPS에서 다소 많았다(28.0%:43.9%, p=0.076). 불량한 임상결과의 유의한 위험인자는 초진시력 0.1 미만, 상피결손 5 mm2 이상, 10일 이상의 증상지속기간, 그리고 전방축농이었다. 결론: 두 군 간에 역학, 임상양상의 차이는 없었으며, 선행인자와 메티실린 감수성의 차이를 보였다. CNS보다 CPS에서 치료 결과가 다소 나빴지만 유의하지 않았다. 불량한 임상결과는 혈장응고효소 양성보다 긴 증상지속기간, 불량한 초진 임상양상과 더 관계 있었다.

Abstract

Purpose: To analyze clinical aspects in a cohort of patients with Staphylococcus keratitis according to coagulase positivity (coagulase negative Staphylococcus [CNS], coagulase positive Staphylococcus [CPS]). Methods: Epidemiology, predisposing factors, clinical characteristics, treatment outcomes, and antibiotic susceptibility were comparatively analyzed in 138 cases of culture-proven Staphylococcus keratitis (94 eyes with CNS and 44 eyes with CPS) over 20 years (1998-2017) at Yeungnam University Hospital. Poor clinical outcomes were defined as a final corrected visual acuity <0.1, a decreased visual acuity after treatment, complications, or surgical treatment. Risk factors for poor clinical outcomes were evaluated in the total cohort and analyzed using multivariate logistic regression. Results: The most common predisposing factors were corneal trauma in the CNS group (47.9%) and previous ocular surface disease in the CPS group (31.8%). No significant differences were observed in mean age, sex, previous ocular surface disease, epithelial defect size, and hypopyon between the two groups. Methicillin susceptibility (39.4% vs. 72.7%, p < 0.001) was significantly lower in the CNS group, and poor clinical outcomes (28.0% vs. 43.9%, p = 0.076) were more common in the CPS group. The significant risk factors for poor clinical outcomes were initial best-corrected visual acuity <0.1, epithelial defect size ≥ 5 mm2, symptom duration ≥10 days, and hypopyon. Conclusions: No significant differences were observed in epidemiological factors and initial clinical characteristics between the two study groups, but predisposing factors and methicillin susceptibility differed between the two groups. Treatment outcomes were relatively worse in the CPS group than in the CNS group, but the difference was not statistically significant. Poor clinical outcomes were more associated with long symptom duration and poor initial clinical characteristics than with coagulase positivity.

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