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The outcomes and risk factors of fetal bradycardia associated with external cephalic version.
OBJECTIVE: The objective of this study is to assess the outcomes and risk factors of fetal bradycardia after external cephalic version (ECV).
METHODS: We performed a retrospective study of women who underwent ECV after 35 weeks of gestation in 2010-2016. We assessed the birth outcomes, including umbilical cord artery pH, according to the duration of fetal bradycardia and the risk factors for bradycardia.
RESULTS: Among 390 cases, 189 (48.5%) cases showed fetal bradycardia during or immediately after ECV. The duration of fetal bradycardia was <1 min (n = 82, 43.4%), <5 min (n = 168, 88.9%); and <10 min (n = 186, 98.4%). All cases showed a good prognosis. Fetal bradycardia lasting >10 min occurred in three cases; emergency cesarean section was performed in each case, with delivery after 12-4 min of bradycardia. Two of three cases showed low Apgar scores at 5 min, with an umbilical cord arterial pH of <7.1. Lower maternal BMI and a prolonged ECV procedure were significantly associated with bradycardia (p for trend: .016 and .015, respectively).
CONCLUSIONS: Fetal bradycardia lasting >10 min after ECV was a risk factor for asphyxia. Thus, delivery should be completed within 10 min after bradycardia. A low maternal BMI and a prolonged ECV procedure were risk factors for bradycardia after ECV.
METHODS: We performed a retrospective study of women who underwent ECV after 35 weeks of gestation in 2010-2016. We assessed the birth outcomes, including umbilical cord artery pH, according to the duration of fetal bradycardia and the risk factors for bradycardia.
RESULTS: Among 390 cases, 189 (48.5%) cases showed fetal bradycardia during or immediately after ECV. The duration of fetal bradycardia was <1 min (n = 82, 43.4%), <5 min (n = 168, 88.9%); and <10 min (n = 186, 98.4%). All cases showed a good prognosis. Fetal bradycardia lasting >10 min occurred in three cases; emergency cesarean section was performed in each case, with delivery after 12-4 min of bradycardia. Two of three cases showed low Apgar scores at 5 min, with an umbilical cord arterial pH of <7.1. Lower maternal BMI and a prolonged ECV procedure were significantly associated with bradycardia (p for trend: .016 and .015, respectively).
CONCLUSIONS: Fetal bradycardia lasting >10 min after ECV was a risk factor for asphyxia. Thus, delivery should be completed within 10 min after bradycardia. A low maternal BMI and a prolonged ECV procedure were risk factors for bradycardia after ECV.
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