Abstract
To assess the incidence of placental basal plate myometrial fibers in preterm and term gestations and correlate this finding with clinical observations and placental histopathology. Placentas from 457 singleton births before 32 weeks' gestation and 108 uncomplicated singleton births after 37 weeks' gestation were examined histopathologically. Pregnancies complicated by maternal chronic hypertension, diabetes mellitus, coagulopathy, placenta previa, stillbirth, multiple fetuses, and fetal congenital anomalies were excluded from both groups. In the preterm group, 158 patients had preterm labor with intact membranes, 192 had preterm premature rupture of membranes (PROM), 31 had placental abruption without hypertension, and 76 had preeclampsia. Histopathology detected the presence of placental basal plate myometrial fibers, placental vascular lesions, and villous damage related to vascular insufficiency. Forty-four of 457 (9.6%) of preterm placentas had basal plate myometrial fibers, compared with one of 108 (0.9%) term controls (P < .001). Uteroplacental vessels with abnormal physiologic changes were more frequent and placental weights were lower in cases with basal plate myometrial fibers (P < .003 and P < .03, respectively). No ...Continue Reading
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