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Individual renal unit urine sampling to identify unilateral metabolic defects
Clinical Nephrology
|October 30, 2018
Summary
Unilateral kidney stone defects are common, with over half of patients showing differences in urine chemistry between their two kidneys. This study demonstrates the feasibility of sampling urine from each kidney to identify these unilateral metabolic abnormalities.
Area of Science:
- Nephrology
- Urology
- Metabolic Medicine
Background:
- Kidney stone recurrence prevention often assumes uniform urine chemistry.
- Metabolic defects are typically considered global, affecting both kidneys equally.
- This study investigates the potential for unilateral (one-sided) metabolic defects.
Purpose of the Study:
- To identify patients with clinically significant unilateral defects in urine chemistry.
- To assess the feasibility and safety of bilateral renal unit urine sampling.
Main Methods:
- Adults undergoing upper urinary tract surgery provided urine samples from each kidney via ureteral catheterization.
- Urine chemistry concentrations were analyzed.
- A significant difference was defined as exceeding the 75th percentile or a pH difference of 0.5.
Main Results:
- Bilateral ureteral catheterization was safe and feasible in 13 enrolled patients.
- Urine was successfully collected from paired renal units in 8 participants.
- Over 60% of these participants (5/8) exhibited at least one unilateral metabolic defect.
Conclusions:
- Bilateral renal unit urine sampling is a safe and feasible method.
- Despite small and variable urine volumes, chemical analysis is possible.
- Unilateral defects in renal electrolyte handling appear relatively common, warranting further investigation into their clinical significance.
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