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Serum creatinine and cystatin C-based estimates of glomerular filtration rate are misleading in acute heart failure

Authors

  • J.S. Swolinsky
  • N.P. Nerger
  • D.M. Leistner
  • F. Edelmann
  • F. Knebel
  • E. Tuvshinbat
  • C. Lemke
  • R. Roehle
  • M. Haase
  • M.R. Costanzo
  • G. Rauch
  • V. Mitrovic
  • E. Gasanin
  • D. Meier
  • P.A. McCullough
  • K.U. Eckardt
  • B.A. Molitoris
  • K.M. Schmidt-Ott

Journal

  • ESC Heart Failure

Citation

  • ESC Heart Fail

Abstract

  • AIMS: We aimed to test whether the endogenous filtration markers serum creatinine or cystatin C and equation-based estimates of glomerular filtration rate (GFR) based on these markers appropriately reflect changes of measured GFR in patients with acute heart failure. METHODS: In this prospective cohort study of 50 hospitalized acute heart failure patients undergoing decongestive therapy, we applied an intravenous visible fluorescent injectate (VFI), consisting of a low molecular weight component to measure GFR and a high molecular weight component to correct for measured plasma volume. Thirty-eight patients had two sequential GFR measurements 48 h apart. The co-primary endpoints of the study were safety of VFI and plasma stability of the high molecular weight component. A key secondary endpoint was to compare changes in measured GFR (mGFR) to changes of serum creatinine, cystatin C and estimated GFR. RESULTS: VFI-based GFR measurements were safe and consistent with plasma stability of the high molecular weight component and glomerular filtration of the low molecular weight component. Filtration marker-based point estimates of GFR, when compared with mGFR, provided only moderate correlation (Pearson's r, range 0.80-0.88, depending on equation used), precision (r(2) , range 0.65-0.78) and accuracy (56%-74% of estimates scored within 30% of mGFR). Correlations of 48-h changes GFR estimates and changes of mGFR were significant (P < 0.05) but weak (Pearson's r, range 0.35-0.39). Observed decreases of eGFR by more than 15% had a low sensitivity (range 38%-46%, depending on equation used) in detecting true worsening mGFR, defined by a >15% decrease in mGFR. CONCLUSIONS: In patients hospitalized for acute heart failure, serum creatinine- and cystatin C-based predictions performed poorly in detecting actual changes of GFR. These data challenge current clinical strategies to evaluate dynamics of kidney function in acute heart failure.


DOI

doi:10.1002/ehf2.13404