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(Circulation. 1959;20:1028.)
© 1959 American Heart Association, Inc.

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Relationship Between Plasma and Extracellular Fluid Volume Depletion and the Antihypertensive Effect of Chlorothiazide

ILSE M. WILSON M.D.¹; EDWARD D. FREIS M.D.¹; Mary J. Taylor ¹

¹ From the Veterans Administration Hospital and the Cardiovascular Research Laboratory, Department of Medicine, Georgetown University School of Medicine, Washington, D. C.

The importance of plasma and extracellular fluid volumes in the mechanism of the antihypertensive effect of chlorothiazide is disputed. The present investigation indicates that the lowering of blood pressure is accompanied by reductions in plasma and extracellular fluid volumes and in body weight. Furthermore, re-expansion of plasma volume with salt-free dextran reverses the antihypertensive effect. However, since gradual reaccumulation of extracellular fluid occurs during 1 year of continuous treatment, the late antihypertensive effects of chlorothiazide cannot be explained by the volume-depletion mechanism.

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