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Wide complex tachycardia in a patient with a baseline conduction abnormality. (A) Baseline electrocardiogram (ECG) showing sinus rhythm and a right bundle branch block in a child with congenital heart disease. (B) The same patient’s ECG during an atrial tachycardia showing a QRS complex similar to baseline. The rhythm is irregular due to variable atrioventricular conduction of the atrial tachycardia.
