circulating prostaglandin metabolites 13,14-dihydro-15-keto-prostaglandin f2 alpha and the bicyclo derivative of prostaglandin e2 were measured in maternal plasma by radioimmunoassay after transabdominal cervicoisthmic cerclage and after transvaginal cerclage ( shirodkar and mcdonald procedures ) performed in the first and second trimesters .
C0033554
prostaglandin
C0012472
prostaglandin e2