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Cystatin C, an easy and reliable marker for assessment of renal dysfunction in children with liver disease and after liver transplantation
Author(s) -
Samyn Marianne,
Cheeseman Paul,
Bevis Lynsey,
Taylor Rachel,
Samaroo Beatrice,
BuxtonThomas Muriel,
Heaton Nigel,
Rela Mohamed,
MieliVergani Giorgina,
Dhawan Anil
Publication year - 2005
Publication title -
liver transplantation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.814
H-Index - 150
eISSN - 1527-6473
pISSN - 1527-6465
DOI - 10.1002/lt.20330
Subject(s) - medicine , cystatin c , renal function , urology , creatinine , liver transplantation , transplantation , cutoff , receiver operating characteristic , gastroenterology , physics , quantum mechanics
Renal dysfunction of variable severity is being increasingly recognized as a major complication of calcineurin inhibitors (CI), in some patients even necessitating renal transplantation. Close and effective monitoring of the renal function is indicated. Current methods for this monitoring are calculation of the glomerular filtration rate (GFR) based on creatinine or exogenous substances like 51 Cr‐EDTA. The first method is unreliable in children and the second is expensive and cumbersome. Cystatin C has been shown to be an accurate marker of glomerular filtration but has not been evaluated in a large cohort of pediatric patients before and after liver transplantation (LT). We evaluated the accuracy of cystatin C in 62 children (30 male) with LT, who had their 51 Cr‐EDTA measured on 40 occasions prior to LT and on 47 occasions after LT. The reciprocal of cystatin C correlated better with 51 Cr‐EDTA GFR (r = .78) than the reciprocal of creatinine (r = .40). Diagnostic accuracy in the identification of reduced GFR was assessed by ROC analysis. Cystatin C yielded the highest area under the ROC curve (AUC) in all groups assessed. From these data a cutoff level of cystatin C predicting 51 Cr‐EDTA GFR < 80 ml/min/1.73m 2 was calculated. A level of 1.06 mg/L was found to have a sensitivity of 91% and a specificity of 81%. Applying this cutoff level in our patient group would have avoided 51 Cr‐EDTA GFR estimation in 43 of the 87 estimations. In conclusion, the use of this simple test could be recommended as screening of renal dysfunction in children with liver disease and after LT. (Liver Transpl 2005;11:344–349.)