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Extracellular fluid volume and glomerular filtration rate in 1,878 healthy potential renal transplant donors. Effects of age, gender, obesity and scaling.

journal contribution
posted on 2023-06-07, 16:11 authored by A. Michael Peters, Laura Perry, Claire A. Hooker, Bethany Howard, Mark D.J. Neilly, Nagabhushan Seshadri, Ravin Sobnack, Andrew Irwin, Hayley Snelling, Thomas Gruning, Neva H. Patel, Richard S. Lawson, Gregory Shabo, Nigel Williams, Surendra Dave, Mark C. Barnfield
Aim. The aim of this study was to investigate the influence of age, gender, obesity and scaling on glomerular filtration rate (GFR) and extracellular fluid volume (ECV) in healthy subjects. Methods. This is a retrospective multi-centre study of 1878 healthy prospective kidney transplant donors (819 men) from 15 centres. Age and body mass index (BMI) were not significantly different between men and women. Slope-intercept GFR was measured (using Cr-51-EDTA in 14 centres; Tc-99m-DTPA in one) and scaled to body surface area (BSA) and lean body mass (LBM), both estimated from height and weight. GFR was also expressed as the slope rate constant, with one-compartment correction (GFR/ECV). ECV was measured as the ratio, GFR to GFR/ECV. Results. ECV was age independent but GFR declined with age, at a significantly faster rate in women than men. GFR/BSA was higher in men but GFR/ECV and GFR/LBM were higher in women. Young women (<30 years) had higher GFR than young men but the reverse was recorded in the elderly (>65 years). There was no difference in GFR between obese (BMI > 30 kg/m2) and non-obese men. Obese women, however, had lower GFR than non-obese women and negative correlations were observed between GFR and both BMI and �t. The decline in GFR with age was no faster in obese versus non-obese subjects. ECV/BSA was higher in men but ECV/LBM was higher in women. ECV/weight was almost gender independent, suggesting that fat-free mass in women contains more extracellular water. BSA is therefore a misleading scaling variable. Conclusion. There are several significant differences in GFR and ECV between healthy men and women.

History

Publication status

  • Published

Journal

Nephrology Dialysis Transplantation

ISSN

0931-0509

Publisher

Oxford University Press

Issue

4

Volume

27

Page range

1429-1437

Department affiliated with

  • Clinical and Experimental Medicine Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-04-17

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