Effect of Endothelin on Plasma Volume and Albumin Escape
作者:
Robert Zimmerman,
Alberto Martinez,
Michael Maymind,
R. Barbee,
期刊:
Circulation Research
(OVID Available online 1992)
卷期:
Volume 70,
issue 5
页码: 1027-1034
ISSN:0009-7330
年代: 1992
出版商: OVID
关键词: hematocrit;radioiodinated serum albumin;rats
数据来源: OVID
摘要:
Previous studies have demonstrated that endothelin-1 (ET-1) is a potent vasoconstrictor that decreases cardiac output and increases hematocrit. The present study was designed to determine if the rise in hematocrit and decrease in cardiac output are in part due to shifts of plasma from the vascular space to the interstitial space. Red blood cell volume and plasma volume were determined by using chromium-51-labeled erythrocytes and iodine-125-labeled albumin, respectively, in anesthetized, nephrectomized, splenectomized rats. The present study demonstrates that ET-1 increases mean arterial pressure and hematocrit. This effect is associated with an increase in total-body albumin escape, which is reflected by a marked reduction in whole-body plasma volume. ET-1 enhanced albumin escape primarily in the liver, lung, and heart at low doses. At high doses, albumin escape increased primarily in the liver, heart, and gastrointestinal tract but not the lung. The present study demonstrates that ET-1 increases hematocrit independent of splenic contraction or renal losses by enhancing loss of plasma volume to the interstitial space without affecting red blood cell volume. Because of the profound pressor effects of ET-1, it is likely that the plasma loss results from increased capillary hydrostatic pressure. (Circulation Research1992;70:1027–1034)
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