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Course: Wide QRS Complex Tachycardia Change to Narrow QRS Complex Tachycardia After ?-Blocker Administration

CME Credits: 1.00

Released: 2023-01-30

A patient in their 80s with a history of paroxysmal atrial fibrillation presented to the emergency department with palpitation, dizziness, nausea, and vomiting. The patient was treated with propafenone 3?×-150 mg/d and discontinued metoprolol use a week ago due to low blood pressure. The patient remained mentally clear. Physical examination revealed a blood pressure of 82/60 mm Hg and heart rate of 160 beats/min. Serum potassium level was 5.2 mmol/L. A 12-lead electrocardiogram (ECG) was obtained (, A).


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