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Mahaim tachycardia and intravenous adenosine
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A 35-year-old woman presented to the emergency department with palpitations and breathlessness. ECG recordings demonstrated a wide complex tachycardia with left bundle branch block (LBBB) morphology. A rhythm strip (lead II) is shown. Retrograde P waves are visible after each QRS complex (grey arrow). Intravenous adenosine was administered as a rapid 12 mg bolus, resulting in sudden termination of the tachycardia …