Serum cystatin C for estimation of residual renal function in children on peritoneal dialysis.
Residual renal function (RRF) is an important parameter in the management of patients on chronic dialysis. The aim of this cross-sectional study was to determine the efficacy of serum cystatin C (CysC) for RRF estimation in 20 children (16 boys, 4 girls; median age 13.4 years) undergoing peritoneal dialysis (PD). For studies of correlation with serum CysC, the average of creatinine clearance rate (Ccr) and urea clearance rate (Curea), Kt/Vurea, and weekly Ccr were evaluated as parameters reflecting RRF. The serum CysC level was found to be negatively correlated with urine volume (r=-0.717, P<0.001), average of Ccr and Curea (r=-0.851, P<0.001), total and renal weekly Ccr (r=-0.795, P<0.001; r=-0.845, P<0.001, respectively), and renal Kt/Vurea (r=-0.793, P<0.001) and positively correlated with peritoneal weekly Ccr (r=0.738, P<0.001) and peritoneal Kt/Vurea (r=0.785, P<0.001). There was no significant association with total Kt/Vurea (r=-0.335, P=0.148). In non-anuric group of patients, serum CysC had no link to peritoneal Kt/Vurea (r=0.573, P=0.066), but was negatively correlated with renal Kt/Vurea (r=-0.609, P=0.047). In the multiple regression analysis, renal Kt/Vurea significantly contributed to log CysC concentration rather than peritoneal Kt/Vurea. The results of this study suggest that serum CysC could be an appropriate marker for RRF, independent of total and peritoneal Kt/Vurea.
Center for Pediatric Oncology, National Cancer Center, Goyang, Korea.
Su Jin
SJ
Kim
Young Bae
YB
Sohn
Sung Won
SW
Park
Dong-Kyu
DK
Jin
Kyung Hoon
KH
Paik
D000293:Adolescent; D015415:Biomarkers / Q000097:blood; D002648:Child; D003404:Creatinine / Q000378:metabolism; D003430:Cross-Sectional Studies; D055316:Cystatin C / Q000097:blood*; D005260:Female; D006801:Humans; D007668:Kidney / Q000503:physiopathology*; D007676:Kidney Failure, Chronic / Q000097:blood / Q000503:physiopathology / Q000628:therapy*; D007677:Kidney Function Tests; D008297:Male; D009391:Nephelometry and Turbidimetry; D010530:Peritoneal Dialysis; D011237:Predictive Value of Tests; D012044:Regression Analysis; D056910:Republic of Korea; D013997:Time Factors; D016896:Treatment Outcome; D014508:Urea / Q000378:metabolism; D014563:Urodynamics
D015415:Biomarkers; C525030:CST3 protein, human; D055316:Cystatin C; D014508:Urea; D003404:Creatinine