ECG of the Month: Supraventricular Tachycardia: In Search of an Underlying Mechanism (JACC: Case Reports)

Editor's Note: This ECG of the Month was adapted from a JACC: Case Reports ECG Challenge. You can access the original article here.

A 63-year-old woman with a past medical history of hypertension presented to the emergency department with three months of recurrent palpitations. A 12-lead electrocardiogram (ECG) was obtained demonstrating a narrow complex tachycardia (Figure 1A).

Figure 1A

Figure 1

Figure 1A: 12-Lead Electrocardiogram Demonstrates a Narrow Complex Tachycardia

Which is the diagnosis?

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