A 45-year-old woman with a history of asthma presents to the emergency department for an acute asthmatic episode. She is in marked respiratory distress and is started on oxygen, albuterol nebulizer, and intravenous steroids. Several minutes after therapy, she is noted to have a marked increase in her heart rate. An ECG is obtained (ECG A).
After 15 minutes, her heart rate slows, and a second ECG is obtained (ECG B).What is the diagnosis?
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