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[Prostaglandin E2, F2 alpha,6-keto-prostaglandin F1 alpha and thromboxane B2 in the placenta of normotensive women and women with pregnancy induced hypertension].

Prostaglandin E2 (PGE2), Prostaglandin F2 alpha (PGF2 alpha),6-keto-prostaglandin F1 alpha (6-keto-PGF1 alpha) and thromboxane B2 (TXB2) were measured with radioimmunoassay in placentae of 18 normotensive and 22 moderate or severe PIH gravidae. The content of PGE2 and PGF2 alpha did not change significantly in placentae of PIH patients suggesting that PGE2 and PGF2 alpha in placenta were not important in causing PIH. The content of placental 6-keto-PGF1 alpha also showed no significant difference, while TXB2 levels were significantly higher in PIH patients. The 6-keto-PGF1 alpha/TXB2 in PIH patients was remarkably lower than in normotensive women. These results indicate that an increase in TXB2 level and thus a decrease in the ratio of 6-keto-PGF1 alpha to TXB2 of placenta may be a pathogenetic factor in PIH.