Abstract

The hemodynamic and physiological changes of pregnancy may predispose women to cardiac arrhythmias such as atrial fibrillation (AF). Nevertheless, new-onset AF in pregnancy remains rare, and treatment is challenging. Current recommendations are to treat pregnant women with AF as non-pregnant adults, by using pharmacological or synchronized electrical cardioversion, without mention of gestational age or possibility of delivery. A 23-year-old nulliparous woman developed new-onset symptomatic AF at 362 weeks gestation, but presented to our hospital was delivered at 364 weeks gestation. Beta-blockers were administered for heart rate control. After 48 hours, the decision was made to proceed with delivery rather than cardioversion. The patient's arrhythmia resolved spontaneously postpartum without further treatment. In pregnant patients near or at term, delivery should be considered in the management of new-onset AF after consultation with cardiology, anaesthesiology, and maternal-fetal medicine.

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