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Patient 6. Electrocardiograms show repetitive double firing of the atrioventricular node A) at baseline and B) with ambulation. C) Intracardiac tracing shows 2 His-bundle (H) and ventricular responses (V) for one atrial impulse displaying simultaneous conduction down the fast and slow pathway.
Hd = His distal; Hm = His mid; Hp = His proximal; LAd = left atrium distal; LAp = left atrium proximal; LV = left ventricle; N = normal; S = supraventricular
