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(a) Note the RBBB pattern during rapid ventricular tachycardia (VT) with inferior axis which is not frequent in arrhythmogenic right ventricular dysplasia (ARVD). The inferior axis suggests a VT origin at the base of the heart but not from the infundibulum (With permission from Dr. Guy Fontaine (Fontaine, 2010)). (b) The signal averaging ECG from a patient with ARVD. Note the end of the latest delayed potential (With permission from Dr. Guy Fontaine (Fontaine, 2010))
