Document Detail


The placenta in pre-eclampsia and intrauterine growth restriction: studies on exchange surface areas, diffusion distances and villous membrane diffusive conductances.
MedLine Citation:
PMID:  16635527     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We test the null hypothesis that the morphometric diffusive conductance of the placental villous membrane does not alter in pregnancies complicated by intrauterine growth restriction (IUGR) or pre-eclampsia (PE). Placentas were collected from cases of normotensive IUGR, pure PE, PE+IUGR and from control pregnancies. Microscopical fields on formalin-fixed, trichrome-stained histological sections were randomly sampled for location and orientation. Using stereological methods, the exchange surface areas of peripheral (terminal and intermediate) villi and their fetal capillaries and the arithmetic and harmonic mean thicknesses of the villous membrane (maternal aspect of trophoblast to luminal aspect of vascular endothelium) were estimated. An index of the variability in thickness of this membrane, and an estimate of its oxygen diffusive conductance, was derived secondarily. Group comparisons were drawn using two-way analysis of variance to identify main effects (of PE or IUGR) and interaction effects (between PE and IUGR). PE did not have significant effects on placental morphology and there were no significant effects of PE or IUGR on membrane thickness or its variability. In contrast, IUGR (with or without PE) was associated with reduced surface areas and this was the principal factor leading to a smaller membrane diffusive conductance in these placentas. When account was taken of fetal mass, specific conductance showed no effects of PE or IUGR despite the mass-specific conductance in pure IUGR placentas appearing to be smaller than that in controls. The decline in total conductances is indicative of perturbations operating at the levels of villous trophoblast and fetal vasculature and these may contribute to fetal hypoxic stress.
Authors:
T M Mayhew; R Manwani; C Ohadike; J Wijesekara; P N Baker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2006-04-24
Journal Detail:
Title:  Placenta     Volume:  28     ISSN:  0143-4004     ISO Abbreviation:  Placenta     Publication Date:    2007 Feb-Mar
Date Detail:
Created Date:  2006-12-22     Completed Date:  2007-03-28     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8006349     Medline TA:  Placenta     Country:  England    
Other Details:
Languages:  eng     Pagination:  233-8     Citation Subset:  IM    
Affiliation:
Centre for Integrated Systems Biology & Medicine, School of Biomedical Sciences, Queen's Medical Centre, University of Nottingham, Nottingham NG7 2UH, UK. terry.mayhew@nottingham.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Biological Transport / physiology
Case-Control Studies
Chorionic Villi / pathology*,  physiopathology
Diffusion
Female
Fetal Growth Retardation / pathology*,  physiopathology
Humans
Pre-Eclampsia / pathology*,  physiopathology
Pregnancy

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