Evolution of Tocolysis Therapy from 1999 to 2024

Preterm birth is the leading cause of death in newborns and children. Tocolytic drugs aim to delay preterm birth by suppressing uterine contractions to allow time for administration of corticosteroids for fetal lung maturation, magnesium sulphate for neuroprotection, and transport to a facility with appropriate neonatal care facilities. However, there is still uncertainty about their effectiveness and safety. Plus, more than 90% of the data regarding tocolytic use comes from patients with threatened preterm labor with intact membranes, with (according to the WHO) only 9% of available data is regarding patients with ruptured membranes. But in May 2024, a new publication adds further information to this subset of patients. In this episode, we will review this ongoing controversy regarding the benefits of tocolytic therapy, and when they may provide the most efficacy. And yes, of course, we will provide the ACOG guidance as well.