Abstract
Purpose
Living kidney donors (LKD) partially compensate the initial loss of glomerular filtration rate (GFR), a phenomenon known as renal functional reserve (RFR). RFR is reduced in the elderly, a population with increased prevalence of chronic kidney disease. We hypothesized that the selected, healthy population of LKD, would specifically inform about the physiological determinants of the RFR and studied it using measured GFR (mGFR).
Methods
We retrospectively analyzed pre-donation and post-donation mGFR in 76 LKD from Tenon Hospital (Paris, France) between 2002 and 2018. In addition to GFR measurements, we collected pre-donation morphologic parameters, demographic data, and kidney volumes.
Results
Mean pre-donation mGFR was 90.11 ± 12.64 mL/min/1.73 m2 and decreased to 61.26 ± 9.57 mL/min/1.73 m2 1 year after donation. Pre-donation mGFR correlated with age (p = 0.0003), total kidney volume (p = 0.0004) and pre-donation serum creatinine (p = 0.0453). Pre-donation mGFR strongly predicted 1-year post-donation mGFR. Mean RFR (increase in GFR of the remnant kidney between pre-donation and post-donation) was 36.67 ± 16.67% 1 year after donation. In the multivariate linear model, RFR was negatively correlated to total kidney volume (p = 0.02) but not with age or pre-donation serum creatinine.
Conclusions
We found that pre-donation mGFR decreases with age and identified low total kidney volume as a predictor of RFR in healthy individuals. This suggests an adaptative and reversible decrease in kidney function rather than age-related damage. Older subjects may have reduced metabolic requirements with subsequent reduction in glomerular filtration and kidney volume and preserved RFR. Therefore, low GFR in older subjects should not preclude kidney donation.
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Abbreviations
- BMI:
-
Body mass index
- BSA:
-
Body surface area
- CKD-Epi:
-
Chronic kidney disease-epidemiology collaboration
- CKD:
-
Chronic kidney disease
- CT:
-
Computerized tomography
- eGFR:
-
Estimated glomerular filtration rate
- ESRD:
-
End-stage renal disease
- GFR:
-
Glomerular filtration rate
- IQR:
-
Interquartile range
- LKD:
-
Living kidney donors
- mGFR:
-
Measured glomerular filtration rate
- RFR:
-
Renal functional reserve
- SD:
-
Standard deviation
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Funding
Pierre Galichon was supported by a grant from ATIP-Avenir 2019.
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Conceptualization and methodology: AO, AB, ML, PG. Data acquisition: AB, AD, ML, PG, LP, NO, EL. Data interpretation: AO, AB, ML, PG. Writing—original draft: AO, AB, PG. Writing—review and editing: AO, AB, AD, ML, JH, EL, LM, PG.
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Our retrospective study was conducted solely on already available data. In compliance with the French legislation, this research does not involve a human person, thus neither formal consent nor approval by an institutional review board is needed (Jardé Act and Law No. 78-17 of 6 January 1978 relating to computers, files and freedoms).
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Orieux, A., Bouchet, A., Doreille, A. et al. Predictive factors of glomerular filtration rate loss associated with living kidney donation: a single-center retrospective study. World J Urol 40, 2161–2168 (2022). https://doi.org/10.1007/s00345-022-04019-x
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DOI: https://doi.org/10.1007/s00345-022-04019-x