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Renal function during recovery from minimal lesions nephrotic syndrome
H A Koomans1, W H Boer, E J Dorhout Mees
1Department of Nephrology and Hypertension, University Hospital, Utrecht, The Netherlands.
Nephron
|January 1, 1987
Summary
Drug recovery in minimal lesions nephrotic syndrome (MLNS) improves kidney function. Natriuresis and improved glomerular filtration rate (GFR) occur as renal defects resolve, reducing sodium retention.
Area of Science:
- Nephrology
- Renal Physiology
Background:
- Minimal Lesions Nephrotic Syndrome (MLNS) is characterized by significant sodium retention.
- The underlying mechanisms of sodium retention in MLNS, particularly the role of renal function, require further elucidation.
Purpose of the Study:
- To investigate the changes in renal function during the natriuretic phase of drug-induced recovery from MLNS.
- To understand the relationship between glomerular filtration rate (GFR), tubular reabsorption, and hormonal changes during MLNS recovery.
Main Methods:
- Longitudinal monitoring of renal function in 6 instances of drug-induced MLNS recovery.
- Measurement of protein excretion, glomerular filtration rate (GFR) via inulin clearance, p-aminohippurate clearance, and fractional clearances (sodium, lithium, uric acid, free water).
- Assessment of plasma protein levels and renin activity.
Main Results:
- Proteinuria decreased 1-3 days before natriuresis onset.
- Natriuresis was associated with increased GFR and filtration fraction.
- Decreased proximal and distal sodium reabsorption fractions were observed.
- Fractional clearances of sodium, lithium, uric acid, and free water increased.
- Renin activity decreased despite minimal rise in plasma proteins.
Conclusions:
- Sodium retention in MLNS appears to stem from a primary renal defect.
- Glomerular filter repair normalizes tubular sodium reabsorption, leading to reduced renin release.