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AJP - Regulatory, Integrative and Comparative Physiology, Vol 265, Issue 5 963-R973, Copyright © 1993 by American Physiological Society
ARTICLES |
R. J. Roman and A. P. Zou
Department of Physiology, Medical College of Wisconsin, Milwaukee 53226.
Although the role of the renal medullary circulation in the control of urinary concentrating ability is well established, its potential influence on tubular sodium reabsorption is not generally recognized. Nearly 30 years ago, changes in the intrarenal distribution of blood flow were first proposed to contribute to the natriuretic response to volume expansion. However, the lack of reliable methods for studying medullary blood flow limited progress in this area. The recent development of laser-Doppler flowmetry and videomicroscopic techniques for the study of the vasa recta circulation has renewed interest in the role of medullary hemodynamics in the control of sodium reabsorption. Results of these studies indicate that changes in renal medullary hemodynamics alter renal interstitial pressure and the medullary solute gradient and play an important role in the natriuretic response to elevations in renal perfusion pressure, intravenous infusion of saline, and changes in tubular sodium reabsorption produced by vasoactive compounds. What is emerging from these studies is the view that changes in renal medullary hemodynamics represent an important but misunderstood and long-ignored factor in the control of tubular sodium reabsorption.
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