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Pulsatility effects of flow on vascular tone in the fetoplacental circulation.
Placenta
November 2020
Maternal and Fetal Health Research Centre, Division of Developmental Biology & Medicine, School of Medical Sciences, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, St. Mary's Hospital, Central Manchester University Hospitals NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, M13 9WL, UK. Electronic address:
Introduction: The regulation of vascular tone in the fetoplacental circulation is governed by endocrine and mechanical forces yielding a relaxed basal state in normal pregnancy. Flow mediated vasodilation, induced by shear stress and endothelial nitric oxide signalling, is key to driving vasorelaxation in this circulation. The pulsatile property of blood flow, as opposed to the flow rate, could provide an additional factor in this regulation, but its effects and signalling have never been explored in the fetoplacental microvasculature.
View Article and Find Full Text PDFThe determination of normal percentages of syncytiotrophoblastic knots in various regions of placenta: where to count the syncytial knots.
Turk Patoloji Derg
September 2015
Department of Pathology, Ağrı Women and Children's Hospital, AĞRI, TURKEY.
Objective: The marginal, basal and subchorial regions of the placenta are considered to be more hypoxic than other regions. Therefore, it is not recommended to determine the increase in syncytiotrophoblast knots, based on the major morphological change in placental hypoxia, from the samples taken from these regions. However, the normal count of knots at various regions of placenta is not investigated.
View Article and Find Full Text PDFMassive subchorial thrombosis (MSCT) is a placental abnormality, the etiology and pathogenesis of which remain inadequately studied. MSCT is characterized by a clinical symptom complex comprising marked intrauterine growth retardation, oligohydramnios, and fetal distress due to placental circulatory problems. Perinatal outcomes are appreciably determined by the term of pregnancy, the degree of placental insufficiency, and neonatal status.
View Article and Find Full Text PDFPlacental pathology, birthweight discordance, and growth restriction in twin pregnancy: results of the ESPRiT Study.
Am J Obstet Gynecol
September 2012
Royal College of Surgeons in Ireland, Dublin, Ireland.
Objective: We sought to evaluate the association between placental histological abnormalities and birthweight discordance and growth restriction in twin pregnancies.
Study Design: We performed a multicenter, prospective study of twin pregnancies. Placentas were examined for evidence of infarction, retroplacental hemorrhage, chorangioma, subchorial fibrin, or abnormal villus maturation.
Pulmonary hypoplasia on preterm infant associated with diffuse chorioamniotic hemosiderosis caused by intrauterine hemorrhage due to massive subchorial hematoma: report of a neonatal autopsy case.
Pathol Int
August 2012
Department of Pathology and Cell Biology, School of Medicine, University of Occupational and Environmental Health, Fukuoka, Japan.
A male infant born prematurely at 31 weeks of gestation weighed 789 g and had mildly brown-colored oral/tracheal aspirates at delivery. The amniotic fluid was also discolored, and its index was below 5. The patient died of hypoxemic respiratory and cardiac failure 2 hours after birth.
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