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The 12‐lead electrocardiogram (ECG) is a fundamental modality to help determine the mechanism and the localization of atrial tachycardias (ATs). Although macroreentrant ATs and focal ATs typically show F‐waves and discrete P‐waves respectively on the 12‐lead ECG, this is not universally the case in scar‐related ATs.1, We present three cases clearly showing the discrepancy between the AT morphology...
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