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Related Experiment Videos

Adverse effects of tocolytic therapy.

Steve Caritis1

  • 1Department of Obstetrics, Gynecology, and Reproductive Sciences, University of Pittsburgh School of Medicine, 300 Halket Street, Pittsburgh, PA 15213, USA.

BJOG : an International Journal of Obstetrics and Gynaecology
|February 18, 2005
PubMed
Summary

Tocolytics can temporarily delay preterm labor for 24-48 hours, aiding maternal transfer and glucocorticoid administration. However, their long-term efficacy for in utero maturation remains uncertain, with choices often based on clinician preference and side effect profiles.

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Area of Science:

  • Obstetrics and Gynecology
  • Perinatology
  • Pharmacology

Background:

  • Preterm labor necessitates interventions to facilitate maternal transport and administer antenatal corticosteroids.
  • Contemporary tocolytic agents can achieve short-term goals but their role in prolonged pregnancy for fetal maturation is debated.
  • Clinicians face numerous tocolytic options, prioritizing efficacy, safety, and ease of administration.

Purpose of the Study:

  • To review the efficacy and safety profiles of various tocolytic agents used in managing preterm labor.
  • To compare the effectiveness of different tocolytic classes, including beta-agonists, prostaglandin inhibitors, atosiban, calcium channel blockers, nitric oxide donors, and magnesium sulfate.
  • To discuss the unresolved question of whether tocolytics can sufficiently prolong pregnancy for in utero fetal maturation.

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Main Methods:

  • Review of placebo-controlled studies and clinical evidence for commonly used tocolytic agents.
  • Analysis of efficacy, safety profiles, and administration considerations for beta-agonists, prostaglandin inhibitors, atosiban, calcium channel blockers, nitric oxide donors, indomethacin, and magnesium sulfate.
  • Discussion of current clinical practice and the basis for tocolytic selection.

Main Results:

  • Beta-agonists, prostaglandin inhibitors, and atosiban demonstrate efficacy in prolonging pregnancy for 24-48 hours, with atosiban offering the best safety profile.
  • Calcium channel blockers are widely used due to ease of use and efficacy, but possess cardiovascular side effects.
  • Indomethacin is effective for short courses, while magnesium sulfate is commonly used in the US despite limited efficacy evidence and reported serious side effects.

Conclusions:

  • Current tocolytic treatments primarily reduce uterine response rather than reversing the parturitional process.
  • The choice of tocolytic agent is often influenced by individual clinician preference.
  • Expectations for tocolytic treatment require reconsideration, particularly regarding long-term pregnancy prolongation for fetal maturation.