신장이식 환자에서 혈청 cystatin C치와 사구체여과율의연관성
Relationship between serum cystatin C and glomerular filtration rate in renal transplant patients
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목적 : 본 연구는 신장이식 환자를 대상으로 혈청 cystatin C와 24시간 크레아티닌 청소율 혹은 사구체여과율 추정치의 상관관계를 분석하고, 사구체여과율의 중등도 저하를 검출하는데 있어서 혈청 cystatin C와 혈청 크레아티닌의 진단적 정확성을 비교하고자 하였다. 방법 : 신장이식을 받은 후 적어도 6개월 이상 경과하고 신기능이 안정적으로 유지된 40명 환자를 대상으로 하였다. 사구체여과율 측정을 위해 24시간 크레아티닌 청소율과 사구체여과율 추정치를 계산하였고, 사구체여과율 추정치는 Modification of Diet in Renal Disease (MDRD) 공식과 Cockcroft-Gault (C-G) 공식에 따랐다. 혈청 cystatin C와 사구체여과율의 상관관계는 선형 회귀분석을 시행하여 평가하였고, 혈청 cystatin C와 혈청 크레아티닌의 진단적 정확성을 비교하기 위해서 비모수 receiver operating characteristic (ROC) 분석을 이용하였다. 결과 : 혈청 cystatin C는 혈청 크레아티닌과 유의한 상관관계를 나타내었고, 혈청 cystatin C의 역수는 24시간 크레아티닌 청소율, MDRD 사구체여과율, C-G 크레아티닌 청소율 사이에 각각 유의한 상관관계를 보였다. 사구체여과율 중등도 저하의 기준을 60 mL/min /1.73 m2 미만으로 정의하여 시행한 비모수 ROC 곡선에서 혈청 cystatin C와 혈청 크레아티닌의 곡선아래면적(AUC)은 사구체여과율의 기준이 24시간 크레아티닌 청소율, MDRD 사구체여과율, C-G 크레아티닌 청소율인 경우 모두에서 유의한 차이가 없었다.
Abstract
Background : Serum cystatin C has been proposed to be a sensitive glomerular filtration rate (GFR) marker. This study was undertaken to evaluate correlation between serum cystatin C and GFR estimates in renal transplant recipients. Methods : Serum cystatin C, serum creatinine and 24-hour creatinine clearance were measured in 40 adult renal transplant recipients. Three different GFR estimates were used: 24-hour creatinine clearance, Modification of Diet in Renal Disease (MDRD) equation, and Cockcroft-Gault formula. Linear regression analysis was performed to evaluate correlations between GFR estimates and serum cystatin C, and nonparametric receiver operating characteristic (ROC) analysis was carried out to compare the diagnostic accuracy of serum cystatin C with that of serum creatinine. Results : Significant correlations were noted between each of the 3 different GFR estimates (from 24-hour creatinine clearance, MDRD equation and Cockcroft-Gault formula) and serum cystatin C. Serum cystatin C also correlated significantly with serum creatinine. In the ROC analysis, the areas under the curve for cystatin C and creatinine were not significantly different when using a cut-off GFR estimate at 60 mL/min/1.73 m2. Conclusions : Serum cystatin C is a useful marker for the assessment of GFR in renal transplant recipients, but it is not clear whether cystatin C is superior to creatinine in detection of a mild to moderate renal impairment.(Korean J Med 70:672-680, 2006)
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