Case 14: A 43-Year-Old Man in the Emergency with Palpitations

This 43-year-old man has a history of paroxysmal narrow QRS tachycardia for over 20 years. The episodes were at first infrequent and terminated spontaneously, however, during the past 2 years they had been occurring every 2-3 months requiring injection of Adenosine:

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ECG ID: E685

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