ECG of the Month: A 44-Year-Old Woman with History of HTN and Nonischemic Cardiomyopathy Presents to ED

A 44-year-old woman with history of hypertension and nonischemic cardiomyopathy presents to the emergency department (ED) with palpitations consistent of a fluttering sensation in her chest, accompanied by dizziness, lightheadedness and fatigue.

Her echocardiogram shows normal LV size and systolic function with LVEF 55 - 60%. Her exercise treadmill myocardial perfusion stress test is negative for inducible ischemia.

The following is her 12 lead electrocardiogram (ECG) during her clinic visit (Figure 1).

Figure 1

Figure 1

The ECG shows which of the following?

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