Demonstration of the discrepancy between AT-wave morphology on 12-lead ECG and AT mechanism in scar-related AT.

The 12-lead ECG is a fundamental modality to help determine the mechanism and the localization of atrial tachycardias (ATs). Although macroreentrant atrial tachycardias (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. 1,2 We present three cases clearly showing the discrepancy between the AT morphology on the 12-lead ECG and the AT-mechanism. This article is protected by copyright. All rights reserved.