Skip Navigation LinksHome > August 15, 2011 - Volume 57 - Issue 5 > Chronic Kidney Disease and Estimates of Kidney Function in H...
JAIDS Journal of Acquired Immune Deficiency Syndromes:
doi: 10.1097/QAI.0b013e318222f461
Clinical Science

Chronic Kidney Disease and Estimates of Kidney Function in HIV Infection: A Cross-Sectional Study in the Multicenter AIDS Cohort Study

Estrella, Michelle M MD, MHS*; Parekh, Rulan S MD, MS*†‡; Astor, Brad C PhD, MPH*†; Bolan, Robert MD§; Evans, Rhobert W PhD‖; Palella, Frank J Jr MD¶; Jacobson, Lisa P ScD, MS†

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Background: Cystatin C has been proposed as an alternative marker of kidney function among HIV-infected persons in whom serum creatinine is affected by extrarenal factors.

Methods: In this cross-sectional study, we compared estimated glomerular filtration rates (eGFR) using serum creatinine versus cystatin C between 150 HIV-uninfected and 783 HIV-infected men. We evaluated the prevalence of chronic kidney disease (CKD; eGFR less than 60 mL/min/1.73 m2) and examined the influence of extrarenal factors on GFR estimates among HIV-infected men.

Results: Estimated GFRSCR was similar by HIV serostatus, but eGFRCYSC was lower in HIV-infected men. A higher proportion of HIV-infected men were classified as having CKD when using eGFRCYSC versus eGFRSCR (7% vs 5%, P < 0.01). In HIV-infected individuals without CKD, eGFRSCR was higher than eGFRCYSC, whereas it was lower than eGFRCYSC in persons with CKD. In HIV-infected men, older age, proteinuria, and prior clinical AIDS were inversely associated with both GFR estimates. Higher serum albumin levels and angiotensin-converting enzyme inhibitor/angiotensin receptor blocker use were associated with lower eGFRSCR. HIV viral load, hepatitis C coinfection, and serum alkaline phosphatase were inversely associated with eGFRCYSC.

Conclusion: Among HIV-uninfected and HIV-infected men of similar social risk behaviors, GFR estimates differed by biomarker and kidney function level. Estimated GFRCYSC classified a larger proportion of HIV-infected men with CKD compared with eGFRSCR. Differences between these GFR-estimating methods may be the result of the effects of extrarenal factors on serum creatinine and cystatin C. Until GFR-estimating equations are validated among HIV-infected individuals, current GFR estimates based on these biomarkers should be interpreted with care in this patient population.

© 2011 Lippincott Williams & Wilkins, Inc.


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