A 21-year-old woman presented to her obstetrician with an incessant supraventricular tachycardia at 160 bpm during her 27th week of pregnancy. She was asymptomatic and unaware of her tachycardia. Left ventricular function was normal. There were times when the tachycardia persisted despite transient AV block. Transesophageal pacing failed to restore sinus rhythm. She was treated with quinidine and a metoprolol. The tachycardia did not terminate, but the atrial rate slowed to 130 bpm. An electrocardiogram is shown in Fig. 150.1 after the initiation of antiarrhythmic drug therapy.
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