Sustained arrhythmias during pregnancy are uncommon. However, when they do occur, atrial tachycardias are usually amenable to pharmacological or electrical therapy. We describe a case of sustained atrial tachycardia in a pregnant patient. The tachycardia was resistant to commonly used antiarrhythmic drugs and to cardioversion but rapidly responded to flecainide, with return to sinus rhythm until the patient was delivered of a healthy baby.

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