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Pathophysiology of amniotic fluid volume homoeostasis

Published online by Cambridge University Press:  10 October 2008

Michael G Ross*
Affiliation:
Harbor-UCLA Medical Center, UCLA School of Medicine, Torrance, USA
M Gore Ervin
Affiliation:
Harbor-UCLA Medical Center, UCLA School of Medicine, Torrance, USA
*
Michael G Ross MD, Associate Professor of Obstetrics and Gynecology, Harbor-UCLA Medical Center, UCLA School of Medicine, Torrance, CA 90509, USA.

Extract

Human and ovine fetuses produce and absorb prodigious amounts of water and electrolytes daily. As will be described, fetal fluid exchange approximates to 300–400ml/kg per day near term. On a per kilogram basis, this is equivalent to an adult ingesting and secreting 15–20 litres per day. Upon delivery, the newborn rapidly adjusts to a much reduced rate of fluid exchange. In this respect, the fetus resembles an amphibian during development: an aquatic phase of in utero gestation and a comparatively arid state following delivery. Although the amphibian-like pattern of development may be partly an example of ‘ontogeny recapitulates phylogeny’, the remarkable volume of fetal fluid exchange suggests an important physiological role for amniotic fluid.

Type
Articles
Copyright
Copyright © Cambridge University Press 1991

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