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A 77-year-old man with a remote history of atrial fibrillation presented to the emergency department reporting fatigue and weakness. The patient said he had not made any recent changes in his diet and that he did not have nausea, vomiting, or diarrhea. He also said he had no palpitations or sensations of a rapid heart rate. He was not taking any atrioventricular nodal blocking agents. An electrocardiogram was obtained, and an atrial flutter with a conduction ratio of 4:1 was diagnosed (Panel A). Laboratory values were remarkable only for a serum potassium level of 2.8 mmol per liter. One month . . . [Full Text of this Article] |
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