A 79-year-old man with a history of hypertension and coronary artery disease presents to the emergency department with a history of palpitations, lightheadedness, and shortness of breath. On physical examination, his pulse is rapid, his blood pressure is 100/60 mm Hg, and there are bilateral rales one-third the way up the lung fields. A portable chest x-ray confirms the presence of vascular congestion and heart failure. An ECG is obtained (ECG A).
It is compared with a previous ECG (ECG B).
What is the diagnosis?
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