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Maternal medicine: Morphometric placental villous and vascular abnormalities in early- and late-onset pre-eclampsia with and without fetal growth restriction

Department of Surgical Research, NPIMR, Northwick Park Hospital, Harrow, UK.
BJOG An International Journal of Obstetrics & Gynaecology (Impact Factor: 3.45). 06/2006; 113(5):580-9. DOI: 10.1111/j.1471-0528.2006.00882.x
Source: PubMed

ABSTRACT

To evaluate placental morphology in pregnancies complicated by early- and late-onset pre-eclampsia (PET) with and without fetal growth restriction (FGR) using stereological techniques.
A total of 69 pregnant women were studied. Twenty women had pregnancies complicated by PET, 17 by FGR and 16 by both PET and FUR; the remaining 16 were from gestational-age-matched controls. Each group was further classified into early onset (<34 weeks) and late onsets (>34 weeks) based on gestational ages.
NPIMR at Northwick Park and St Marks Hospital.
placentae from pregnant women.
Formalin-fixed, wax-embedded sections stained with anti-CD34 antibodies and counterstained with haematoxylin.
Volumes, surface areas, lengths, diameters and shape factors of the villous tissues and fetal vasculature in the intermediate and terminal villi of all the groups studied.
Terminal villi volume and surface area were compromised in early-onset PET cases, late-onset PET had no impact on peripheral villi or vasculature features. The morphology of the vascular and villous subcomponents in the intermediate and terminal villi was significantly influenced by late-onset FGR, whereas early-onset FGR caused a reduction in placental weight. Length estimates were not influenced by PET, FGR or age of onset. Intermediate arteriole shape factor was significantly reduced in late-onset FGR.
Isolated early-onset PET was associated with abnormal placental morphology, but placentas from late-onset PET were morphologically similar to placentas from gestational-age-matched controls, confirming the existence of two subsets of this condition and supporting the hypothesis that late-onset PET is a maternal disorder and not a placental disease.

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Available from: Michael Egbor, Nov 21, 2014
    • "Although pathogenesis of preeclampsia is not clear yet, low placental perfusion, hypoxia, and uteroplacental ischemia by the impaired trophoblast invasion are focused mostly on the pathogenesis. It is also indicated that especially early-onset preeclampsia (before 34 gestational weeks) was associated with impaired placental invasion and abnormal placental morphology by studies which investigate placentas of preeclamptic cases morphologically [4]. Association between preeclampsia and increased apoptosis of cytotrophoblasts among placental bed has been reported in recent studies [19]. "

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    • "While the numbers in these groups were small the trend suggests this may be indicative of a more severe form of the disease [23] [25] associated with restricted uteroplacental blood flow [26]. Abnormal placental morphology including significantly reduced intervillous space and terminal villi volume [24] may play a role in the long term deficit of motor development seen in offspring with preeclampsia. Future research comparing the impact of early and late onset preeclampsia on motor development and the role of reduced placental function will require a larger sample size to support these findings. "
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    • "FGR affects 4–7% of live births in developed countries and contributes significantly to prematurity, perinatal morbidity, and mortality (Wang et al., 2007). Investigations using random block sampling and stereological studies reported reductions in the number, surface area, and volume of terminal villi in FGR-affected placentae, compared with placentae from uncomplicated pregnancies (Biagiotti et al., 1999; Egbor et al., 2006; Biswas et al., 2008; Vedmedovska et al., 2011; Almasry et al., 2012; Almasry and Elfayomy, 2012). Additionally, villous vessels exhibited fewer branches, and a majority of the vessels were slender and uncoiled (Teasdale, 1984; Teasdale and Jean-Jacques, 1988; Jackson et al., 1995; Chen et al., 2002; Mayhew, 2003; Tomas et al., 2010). "
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