PMID: 3766728Oct 1, 1986Paper

Continuous ovine fetal hemorrhage: sensitivity of plasma and urine arginine vasopressin response

The American Journal of Physiology
M G RossD A Fisher

Abstract

Intravascular hemorrhage of the ovine fetus is a potent stimulus for arginine vasopressin (AVP) secretion. However, the method (acute, continuous) and rate of blood withdrawal may influence the fetal response. To determine the hemorrhage threshold for AVP secretion in response to slow continuous hemorrhage, five chronically catheterized ovine fetuses were continuously hemorrhaged (0.6% blood vol/min) to 24-30% blood volume withdrawal. Immediately after hemorrhage fetal blood was reinfused at an equivalent rate. In addition to AVP measurements by radioimmunoassay, fetal urinary responses were monitored as an index of fetal AVP secretion. Significant increases in plasma AVP occurred during hemorrhage (1.0 +/- 0.1 to 8.0 +/- 2.0 pg/ml). The fetal plasma AVP-hemorrhage threshold, as defined by regression analysis, occurred at withdrawal of 13.0% blood volume. Fetal urine volume significantly decreased from a mean basal rate of 0.59 +/- 0.03 to 0.21 +/- 0.06 ml/min at the completion of hemorrhage. Urinary sodium, potassium, and osmolar excretion also significantly decreased at the completion of hemorrhage. Urinary AVP excretion, urine osmolality, sodium, and potassium concentrations did not change significantly during the hemorrhage...Continue Reading

References

Mar 1, 1979·Circulation Research·H S IwamotoM A Heymann
Aug 1, 1980·Pflügers Archiv : European journal of physiology·F T LaRochelleP Stern
Aug 1, 1983·American Journal of Obstetrics and Gynecology·R T KellyM Morris
Jun 1, 1983·Circulation Research·R A Brace
Jan 1, 1981·Circulation Research·J E RobillardF G Smith
Jun 1, 1982·Pediatric Research·G W DeVaneC R Rosenfeld

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Citations

Dec 20, 2003·American Journal of Physiology. Heart and Circulatory Physiology·Zhice XuJiaming Yao
Apr 8, 2010·American Journal of Physiology. Endocrinology and Metabolism·Lijun ShiZhice Xu
Jan 25, 2005·American Journal of Physiology. Heart and Circulatory Physiology·Mina DesaiMichael G Ross
Apr 12, 2003·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Mina DesaiMichael G Ross

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