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Renal Regulation of Sodium ExcretionFunction in Health and in Edema-Forming States
Saulo Klahr, MD;
Eduardo Slatopolsky, MD
Arch Intern Med. 1973;131(6):780-791.
Abstract
Urinary sodium excretion could be regulated through changes in glomerular filtration rate (GFR) or sodium reabsorption. However, marked changes in GFR may result in only small changes in urinary sodium excretion. This suggests that alterations in sodium excretion result from changes in net sodium reabsorption along the nephron. Several factors play a role in the regulation of sodium excretion, but their relative importance has not been defined perfectly. They include (1) the intrarenal distribution of glomerular filtrate, (2) hormonal effects (aldosterone), (3) peritubular physical factors (hydrostatic and oncotic pressure), and (4) the possible existence of a natriuretic material.
Edema-forming states result from the renal retention of salt and water. In these states, the rate of sodium and water excretion is less than the rate of entry of salt and water. Thus, the kidneys are responsible for salt and water retention.
Author Affiliations
St. Louis
From the Renal Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis.
Footnotes
Received for publication Feb 5,1973; accepted Feb 6.
Reprint requests to 4550 Scott Ave, St. Louis, MO 63110 (Dr. Klahr).
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