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Kidney Function in Obesity-Challenges in Indexing and Estimation.

Alex R Chang1, Waleed Zafar1, Morgan E Grams1

  • 1Kidney Health Research Institute, Geisinger Health System, Danville, PA; Department of Epidemiology and Health Services Research, Geisinger Health System, Danville, PA; Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins University, Baltimore, MD; and Divison of Nephrology, Johns Hopkins University, Baltimore, MA.

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Summary

Obesity increases kidney disease risk. Current methods for assessing kidney function and drug dosing in obese individuals may be inaccurate, necessitating further research into unindexed glomerular filtration rate (GFR) for better clinical outcomes.

Keywords:
Glomerular filtration rateIndexingObesityScalingeGFR

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Area of Science:

  • Nephrology
  • Pharmacology
  • Obesity Medicine

Background:

  • Rising global obesity rates correlate with increased risk of kidney disease.
  • Standard assessment of kidney function, glomerular filtration rate (GFR) indexed to body surface area (BSA), presents challenges in obese populations.
  • Indexing GFR to BSA can lead to lower indexed GFR values in obese individuals, impacting drug dosing calculations.

Purpose of the Study:

  • To address the critical need for accurate kidney function assessment in obese individuals.
  • To investigate the implications of indexed versus unindexed GFR for drug dosing in obesity.
  • To evaluate the performance of current GFR estimation methods and biomarkers in the context of obesity.

Main Methods:

  • Review of current practices in indexing glomerular filtration rate (GFR) to body surface area (BSA).
  • Analysis of the impact of indexing on GFR values in obese populations.
  • Discussion of potential biases introduced by biomarkers like creatinine and cystatin C.
  • Identification of the need for pharmacokinetic data to support unindexed GFR for drug dosing.

Main Results:

  • Conventional GFR indexing to BSA results in significantly lower values for obese individuals compared to unindexed GFR.
  • Biomarkers such as creatinine (influenced by muscle mass) and cystatin C (correlated with fat mass) may introduce bias independent of actual kidney function.
  • Current data suggest unindexed GFR may be acceptable for drug dosing, but supporting pharmacokinetic data are lacking.

Conclusions:

  • Further research is essential to evaluate GFR estimating equations and filtration markers in obesity.
  • Determining whether unindexed GFR better predicts drug dosing and clinical outcomes in patients with significantly different BSAs is crucial.
  • Optimizing kidney function assessment and drug dosing in obese patients is vital for improving clinical outcomes.