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Related Experiment Videos

A quality assessment tool to evaluate tocolytic studies.

R F Lamont1

  • 1Department of Obstetrics and Gynaecology, Northwick Park & St Mark's NHS Trust, London, UK.

BJOG : an International Journal of Obstetrics and Gynaecology
|January 9, 2007
PubMed
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The quality of studies on nifedipine for treating preterm labor is poor, with limited evidence for its effectiveness. Future guidelines should acknowledge this paucity of high-quality research on calcium channel blockers.

Area of Science:

  • Obstetrics and Gynecology
  • Pharmacology

Background:

  • Beta-agonist use for preterm labor has decreased globally.
  • Clinicians face choices between continuing beta-agonists, stopping tocolysis, or switching to atosiban or calcium channel blockers (CCBs).
  • Atosiban shows strong evidence of efficacy and safety, unlike CCBs such as nifedipine.

Purpose of the Study:

  • To systematically review the quality of existing studies on nifedipine for spontaneous preterm labor.
  • To assess the robustness of evidence supporting CCBs as a tocolytic agent.
  • To inform guideline development by highlighting limitations in current research.

Main Methods:

  • A systematic review tool assessing method- and topic-specific quality markers was developed.
  • An extensive literature search identified 31 studies on nifedipine for spontaneous preterm labor.

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  • Eight experienced reviewers assessed 40 quality items for each study.

    • Main Results:

    • The systematic review revealed a paucity of high-quality studies on nifedipine for spontaneous preterm labor.
    • Existing evidence for nifedipine is largely based on small, underpowered, investigator-led studies.
    • No placebo-controlled trials have been performed for nifedipine in this context.

    Conclusions:

    • The low quality and limited number of studies on nifedipine should be explicitly stated in meta-analyses and systematic reviews.
    • Guideline recommendations for nifedipine should be carefully considered due to the weak evidence base.
    • Further high-quality research is needed to establish the efficacy and safety of CCBs for preterm labor.