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    ARRIVE study: 39-week induction reduces frequency of cesarean in healthy women

     

    Does intrapartum O2 administration affect Category II EFM patterns?

    A study presented at the 2018 Annual meeting for the Society for Maternal-Fetal Medicine found that intrapartum maternal oxygen supplementation has no impact on Category II electronic fetal monitoring (EFM) patterns.   

    The researchers performed a secondary analysis of a randomized trial conducted from 2016-2017, in which 114 patients in active labor with Category II EFM were assigned to 10L/min O2 by face mask or room air (RA) until delivery. The primary outcome of this analysis was resolution of recurrent decelerations (late and/or variable) within 60 minutes of randomization. Secondary outcomes were presence of recurrent variables, recurrent late decelerations, tachycardia, or minimal variability. Outcomes in the two groups were compared using univariable statistics and time-to-event analysis was used to compare time to resolution between the groups.   

    There was no difference in resolution of recurrent decelerations within 60 minutes between the two groups of patients (O2 75.4% vs RA 86.0%, P = 0.15).  Both the RA and O2 groups had similar time to resolution of recurrent deceleration. They also had similar rates of recurrent variables, recurrent late decelerations, tachycardia and minimal variability 30 and 60 minutes after randomization. Given the similarity of the findings in both groups, the researchers concluded that O2 administration has no impact on Category II EFM patterns.     

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    Judith M. Orvos, ELS
    Judith M. Orvos, ELS, is a a BELS-certified medical writer and editor and an editorial consultant for Contemporary OB/GYN.
    Ben Schwartz
    Ben Schwartz is Associate Editor, Contemporary OB/GYN.

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