Document Detail

Marked association between obesity and glomerular hyperfiltration: a cross-sectional study in an African population.
MedLine Citation:
PMID:  20538392     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Obesity and African American ethnicity are established independent risk factors for the development of chronic kidney disease. No data exist about the association between obesity and renal hemodynamics in the African region. STUDY DESIGN: Cross-sectional study. SETTING & PARTICIPANTS: 301 nondiabetic participants (97 lean, 108 overweight, and 96 obese) of African descent with a positive family history of hypertension from the Seychelles islands. PREDICTOR: Body mass index (BMI). OUTCOMES: Glomerular hyperfiltration, glomerular filtration rate (GFR), effective renal plasma flow (ERPF), and filtration fraction. MEASUREMENTS: GFR and ERPF were measured using inulin and para-aminohippurate clearances, respectively. Participants' baseline demographics, laboratory data, and blood pressure were measured using standard techniques. RESULTS: The prevalence of glomerular hyperfiltration (defined as GFR >or=140 mL/min) increased across BMI categories (7.2%, 14.8%, and 27.1% for lean, overweight, and obese participants, respectively; P < 0.001). Higher BMI was associated with higher median GFR (99, 110, and 117 mL/min for lean, overweight, and obese participants, respectively; P < 0.001), ERPF (424, 462, and 477 mL/min, respectively; P = 0.01), and filtration fraction (0.23, 0.24, and 0.25; P < 0.001). Multivariate analyses adjusting for age, sex, blood pressure, fasting glucose level, and urinary sodium excretion and accounting for familial correlations confirmed the associations between high BMI (>25 kg/m(2)) and increased GFR, ERPF, and filtration fraction. No association between BMI categories and GFR was found with adjustment for body surface area. LIMITATIONS: Participants had a positive family history of hypertension. CONCLUSION: Overweight and obesity are associated with increased GFR, ERPF, and filtration fraction and a high prevalence of glomerular hyperfiltration in nondiabetic individuals of African descent. The absence of associations between BMI categories and GFR indexed for body surface area raises questions regarding the appropriateness of indexing GFR for body surface area in overweight populations.
Grégoire Wuerzner; Menno Pruijm; Marc Maillard; Pascal Bovet; Claude Renaud; Michel Burnier; Murielle Bochud
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-06-09
Journal Detail:
Title:  American journal of kidney diseases : the official journal of the National Kidney Foundation     Volume:  56     ISSN:  1523-6838     ISO Abbreviation:  Am. J. Kidney Dis.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-27     Completed Date:  2010-08-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8110075     Medline TA:  Am J Kidney Dis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  303-12     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 National Kidney Foundation, Inc. Published by Elsevier Inc. All rights reserved.
Department of Medicine, Service of Nephrology, Centre Hospitalier Universitaire Vaudois, Lausanne, Switzerland.
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MeSH Terms
Body Mass Index
Cross-Sectional Studies
Glomerular Filtration Rate* / physiology
Kidney / blood supply
Kidney Glomerulus / physiopathology*
Middle Aged
Multivariate Analysis
Obesity / ethnology*,  physiopathology*
Overweight / ethnology,  physiopathology
Regional Blood Flow
Seychelles / epidemiology
Comment In:
Am J Kidney Dis. 2010 Aug;56(2):255-8   [PMID:  20659626 ]

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