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A: Continuous strip from sinus rhythm with induction of ventricular tachycardia (VT) with triple extrastimuli (500-300-260-250 ms) to demonstrate constant gain and minimal baseline noise. Five beats of the drive cycle have been removed. The intraseptal late potential (SPd) recorded during pacing rhythm become pandiastolic during VT. B: Twelve-lead electrocardiogram of VT (tachycardia cycle length 360 ms) with septal perforating vein recording spanning entirety of diastole at 150 mm/s.
