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Effectiveness of nifedipine in threatened preterm labor: a randomized trial

Authors Songthamwat S, Na Nan C, Songthamwat M

Received 6 December 2017

Accepted for publication 24 April 2018

Published 15 June 2018 Volume 2018:10 Pages 317—323

DOI https://doi.org/10.2147/IJWH.S159062

Checked for plagiarism Yes

Review by Single-blind

Peer reviewers approved by Dr Andrew Yee

Peer reviewer comments 4

Editor who approved publication: Professor Elie Al-Chaer


Srisuda Songthamwat, Chatchanawadee Na Nan, Metha Songthamwat

Department of Obstetrics and Gynecology, Udonthani Hospital, Udonthani, Thailand

Objective: Threatened preterm labor is a condition in which regular uterine contractions occur at least 1 time in 10 minutes and persist for more than 30 minutes before completion of 37 weeks of gestation without dilatation of the cervix. In preterm labor with cervical dilatation, the efficacy of tocolytics was proven for prolonging pregnancy. However, in threatened preterm labor, the efficacy of tocolytics has not yet been well studied. This study aimed to evaluate the effectiveness of nifedipine versus a placebo for inhibiting uterine contraction in threatened preterm labor.
Materials and methods: A randomized, double-blinded, placebo-controlled study with 206 threatened preterm labor patients was undertaken. The participants were randomly allocated into either nifedipine or placebo groups. The proportion of patients with successful treatment, gestational age at delivery, and neonatal outcome were compared between the 2 groups.
Results: After 90 minutes of treatment, 88.3% of the nifedipine group and 69.9% of the placebo group had no uterine contraction (P<0.001). Nifedipine led to successful treatment outcomes in 77.6% of the total participants compared with 49.5% in the placebo group (P<0.001). The remainder of the participants from both groups needed a second-line tocolytic drug. Of these, 9.7% in the nifedipine group delivered within 48 hours compared with 12.6% in the placebo group (P>0.05). Mean gestation age at delivery and neonatal complications for both groups were not significantly different.
Conclusion: Nifedipine had a higher success rate for inhibiting threatened preterm contractions.

Keywords: nifedipine, threatened preterm labor, preterm labor, tocolysis, randomized trial

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