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Am J Perinatol. 1991 Mar;8(2):150-2.

Type I second-degree AV block (Mobitz type I, Wenckebach AV block) during ritodrine therapy for preterm labor.

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  • 1Department of Obstetrics and Gynecology, Strong Memorial Hospital, University of Rochester School of Medicine, New York 14642.


A patient, while on intravenous ritodrine therapy for preterm labor, experienced an episode of acute chest pain. The electrocardiogram (ECG), which was read as normal prior to ritodrine infusion, demonstrated a type I second-degree AV block which disappeared upon discontinuation of ritodrine therapy. This case illustrates the need for close ECG monitoring during ritodrine treatment when clinical symptoms arise.

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