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Abstract
To study the change and clinical significance of interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha) levels in the maternal serum and amniotic fluid of pregnant women with chorioamnionitis and with premature rupture of membranes. Twenty-six normal-term pregnant women formed the control group, and forty-six pregnant women with premature rupture of membranes were enrolled for the study. Maternal serum and amniotic fluid IL-6 and TNF-alpha levels were measured using a sensitive radioimmunoassay and enzyme-linked immunosorbent assay (ELISA); chorioamnionitis was diagnosed by fetal membrane pathology. The maternal serum IL-6 levels and amniotic fluid IL-6 and TNF-alpha levels were higher than those of the control (P < 0.01). There was a significant relationship between maternal serum IL-6 and maternal serum and amniotic fluid IL-6 and TNF-alpha with the time of the premature rupture of membranes, i.e. the longer the time, the higher the maternal serum and amniotic fluid IL-6 and TNF-alpha. There were 12 patients with chorioamnionitis in premature rupture of membranes and their maternal serum and amniotic fluid IL-6 and TNF-alpha levels were higher than that of non-chorioamnionitis patients (P < 0.01-0.05). IL-6 and TNF-alpha levels in maternal and amniotic fluids are a valuable index in identification of the chorioamnionitis in patients with premature rupture of membranes.

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