Focal atrial tachycardias arise preferentially from specific locations within the atria. Careful analysis of the P
wave can provide useful information about the chamber and likely site of origin within that chamber. Macro-reentrant
atrial flutter also tends to occur over a limited number of potential circuits. In this case, the ECG usually gives a guide to
the chamber of origin, but unless it shows a specific morphology it is less useful in delineating the circuit involved. Nonetheless,
prior knowledge of the likely chamber of origin helps to plan the ablation strategy.
Keywords: Atrial tachycardia, catheter ablation, P wave morphology.
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