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contentuptodate· Content· item f36_31_37364
©2013 UpToDate ® Print Email 12-lead electrocardiogram (ECG) of a right posteroseptal accessory AV pathway The 12 lead ECG during rapid atrial pacing shows QRS complexes that are maximally preexcited; the complexes have a pattern suggesting an AV accessory pathway located in the right posteroseptal area. At the time of ablation, the pathway was localized to the midseptal region.