Atrial Fibrillation as a Rare Complication of the Use of Nifedipine as a Tocolytic Agent: A Case Report and Review of the Literature.

Calcium channel blockers are commonly used tocolytic agents on Labor and Delivery units worldwide as part of the management of preterm labor. Despite their overall reassuring safety profile, rare cardiovascular complications have been reported. In this report, we describe the case of threatened preterm labor managed with nifedipine with subsequent development of atrial fibrillation.