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[Edema and the nephrotic syndrome]
M Klein1, J Henschkowski, Z Yu
1Klinik und Poliklinik für Nephrologie und Hypertonie, Inselspital, Universitätsspital, Bern.
Therapeutische Umschau. Revue Therapeutique
|December 21, 2004
Summary
Nephrotic syndrome, characterized by massive proteinuria, leads to edema via salt and water retention. Two theories explain edema formation, differing in plasma volume changes and renal sodium retention mechanisms.
Area of Science:
- Nephrology
- Internal Medicine
Context:
- Nephrotic syndrome arises from significant, persistent proteinuria, often exceeding 3.5 g/day.
- Key features include hypoalbuminemia (below 25 g/l) and edema formation due to salt and water retention.
- Underlying causes typically involve glomerulonephritis or, rarely, severe renal artery stenosis.
Purpose:
- To elucidate the pathophysiology of edema in nephrotic syndrome.
- To differentiate between the classical "underfill" theory and alternative mechanisms of sodium retention.
- To provide an overview of current therapeutic strategies.
Summary:
- Massive proteinuria in nephrotic syndrome causes edema through salt and water retention.
- The "underfill" theory posits reduced plasma volume and renal hypoperfusion, primarily in pediatric minimal change disease.
- In adults, particularly with glomerulonephritis, edema is linked to intrinsic renal excretory defects and plasma volume expansion.
Impact:
- Clarifies complex mechanisms of edema in nephrotic syndrome.
- Highlights differences in pathophysiology between pediatric and adult presentations.
- Informs targeted therapeutic approaches for glomerular diseases and symptomatic edema management.