Background: To evaluate the levels of insulin-like growth factor-binding protein-1 (IGFBP-1) in cervicovaginal secretions before and after midtrimester amniocentesis and relate to clinical outcome.
Methods: 100 consecutive amniocentesis procedures were studied. We measured the IGFBP-1 concentration by radioimmunoassay in a cervicovaginal specimen before and after mid-trimester amniocentesis. The post-amniocentesis occurrence of vaginal loss of fluid or blood and abdominal pain was assessed by questionnaire.
Results: In 6 cases there was a 100-fold increase in IGFBP-1 levels after amniocentesis. Loss of fluid per vaginam occurred in 4 (67%) of these pregnancies, compared to 3.2% of pregnancies without significant surge (p < 0.0001). In addition, post-procedural abdominal pain was more common among women with increased IGFBP-1 levels after amniocentesis (50 vs. 14%, p = 0.05). Two (33%) of the 6 patients with increased IGFBP-1 after amniocentesis delivered prior to 37 weeks as a result of spontaneous preterm labor and/or preterm ruptured membranes, compared to 7 (7%) in the group without surge in IGFBP-1 (p = 0.09).
Conclusion: Increased post-procedure IGFBP-1 levels are after mid-trimester amniocenteses are related to procedure-related complications like abdominal pain and subsequent amniotic fluid leakage.
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