Journal
AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY
Volume 188, Issue 1, Pages 269-274Publisher
MOSBY-ELSEVIER
DOI: 10.1067/mob.2003.11
Keywords
inflammation; fever; chorioamnionitis; interleukin-6; pregnancy; placenta
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OBJECTIVE: This study was undertaken to determine whether intrapartum fevers at term are associated with markers of acute inflammation in maternal, fetal, and placental compartments. STUDY DESIGN: Term cases with intrapartum fever (temperature greater than or equal to100.4degreesF) were recruited with gestational age-matched controls. Maternal serum and umbilical vein blood were collected and assayed for interleukin-6 (IL-6) levels. Placentas were examined for histologic chorioamnionitis. Demographic and clinical data were collected and compared between cases and controls. RESULTS: Forty-seven case-control pairs were analyzed. Maternal IL-6 levels were higher in cases than in controls (median of 145 pg/mL vs 42 pg/mL, P < .0001). Umbilical vein IL-6 levels also were higher in cases than controls (median 9 pg/mL vs 3.5 pg/mL, P = .01), but more than half of levels in cases were below 11 pg/mL. Only 31.1% of febrile cases had moderate or severe histologic chorioamnionitis. Multivariable logistic regression identified maternal serum IL-6 levels, nulliparity, and number of vaginal examinations as the major predictors of intrapartum fever at term. CONCLUSION: The maternal inflammatory response as measured by maternal serum IL-6 levels is a strong marker for term intrapartum fever. The much weaker association of fetal and placental inflammatory responses suggest a smaller than expected contribution of intra-amniotic inflammation to term intrapartum fevers.
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