A 73-year-old woman is admitted to the hospital for a community-acquired pneumonia, which was confirmed on a chest x-ray. Her temperature is 102°F, and on physical examination, she has rales and rhonchous sounds at the left base. A routine ECG is obtained (ECG A). After admission, the ECG is examined by the hospitalist, who is uncertain about the rhythm. He therefore repeats the ECG (ECG B).
What is the diagnosis?
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