A 76-year-old woman is admitted to the hospital for pyelonephritis associated with bacteremia. She is started on intravenous fluid and appropriate antibiotics. Two days after admission, she is noted to have bradycardia while sleeping, and a 12-lead ECG was obtained (ECG 1A; Figure [A]). On the following day, the ECG is repeated (ECG 1B; Figure [B]). What is the diagnosis?
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