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Reversible renal failure in the nephrotic syndrome
1Renal Division, Yale University School of Medicine, New Haven, CT 06510.
Summary
Acute renal failure in minimal change disease can occur with normal glomeruli. This review suggests it may stem from ischemic injury interacting with intrinsic renal abnormalities, not just volume depletion.
Area of Science:
- Nephrology
- Pathophysiology
- Renal Medicine
Background:
- Acute renal failure (ARF) can occur in patients with minimal change disease (MCD) and normal or minimally altered glomeruli.
- Nephrotic syndrome is characterized by heavy proteinuria, hypoalbuminemia, and edema, and can be associated with ARF.
Purpose of the Study:
- To review clinical features of ARF in MCD patients.
- To identify factors contributing to reduced glomerular filtration rate (GFR) in this population.
- To explore the pathogenesis of ARF in minimal change nephrotic syndrome.
Main Methods:
- Literature review of 79 cases (75 patients) of ARF with MCD since 1966.
- Analysis of clinical data including age, proteinuria, serum albumin, and time to ARF.
- Evaluation of hemodynamic determinants of GFR in patients and animal models.
Main Results:
- ARF occurred a median of 29 days after nephrotic syndrome onset; recovery took 7 weeks in most cases.
- Acute tubular necrosis (ATN) was observed in at least 60% of biopsies.
- Reduced glomerular ultrafiltration coefficient (by up to 50%) was suggested, with preserved blood volume and renal plasma flow.
Conclusions:
- Hypovolemia is unlikely to be the primary cause of ARF in MCD.
- ARF in MCD may result from an interplay between acute ischemic injury and underlying renal abnormalities.
- Further research into hemodynamic factors is needed to understand GFR reduction in minimal change nephrotic syndrome.