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Regular narrow QRS tachycardia, particularly if well‐tolerated, is usually considered a “benign” arrhythmia of a supraventricular origin. This case concerns an 82‐year‐old male with ischemic heart disease who presented with recurrent episodes of a narrow QRS tachycardia that was initially diagnosed and treated as atrial tachyarrhythmia. However, careful physical examination and ECG analysis established...
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