Hyperfiltration during early childhood precedes albuminuria in pediatric sickle cell nephropathy

Academic Article

Abstract

  • © 2018 Wiley Periodicals, Inc. Background: In patients with diabetes mellitus, hyperfiltration precedes the development of albuminuria. Pediatric sickle cell anemia (SCA) patients have a high prevalence of hyperfiltration and albuminuria during early childhood and adolescence. We tested the hypothesis that hyperfiltration precedes the development of albuminuria in a longitudinal pediatric SCA cohort. Methods: We identified 91 participants with HbSS or SB0 thalassemia 5-21 years of age enrolled in a longitudinal sickle cell nephropathy cohort study who had a cystatin C measured during early childhood (4-10 years of age). Early hyperfiltration was defined as a mean eGFR >180 mL/min/1.73m 2 using cystatin C obtained from 4 to 10 years of age. Persistent albuminuria was defined as an albumin to creatinine ratio > 30 mg/g on two of three untimed urine specimens. Time to event analysis estimated survival curves for participants with and without hyperfiltration using Kaplan-Meier curves and used logrank test for categorical variables to assess the association with time to development of the first episode persistent albuminuria. Results: Persistent albuminuria occurred more often and at an earlier age in participants with early hyperfiltration compared to those without early hyperfiltration (log-rank, P =.004). Participants who developed albuminuria have a significant increase in their eGFR during childhood (P =.003) as compared to participants who have not yet progressed to albuminuria (P =.26). For every 1 g/dL increase in hemoglobin, the hazard ratio for developing persistent proteinuria decreased by 0.56 (95% CI: 0.3, 1.06, P =.07). Conclusion: Hyperfiltration precedes the development of persistent proteinuria in pediatric SCA patients. Intervention strategies should target lowering eGFR during early childhood.
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    Digital Object Identifier (doi)

    Author List

  • Lebensburger JD; Aban I; Pernell B; Kasztan M; Feig DI; Hilliard LM; Askenazi DJ
  • Start Page

  • 417
  • End Page

  • 423
  • Volume

  • 94
  • Issue

  • 4