A 70-year-old woman comes to your clinic with discomfort in her chest for the past 5 hours. She has hypertension that is controlled with lisinopril. Pulse is 145/min and BP is 122/80 mm Hg.A portion of the ECG is shown. Troponin I levels are normal.Which of the following is the most likely mechanism behind this patient’s ECG findings?
Dilation of the left atrium from long-standing mitral stenosis
Development of a reentrant rhythm within the atrioventricular node
Electrolyte disturbance from the use of lisinopril
Ectopic foci of electrical activity within the pulmonary veins
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