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Electrophysiology study. After a double extra stimulation from right ventricular apex, ventricular tachycardia was provoked (arrows). The interval between S1–S1, S1–S2, and S2–S3 is 400, 210, and 190 milliseconds. Il, lll, limb lead of body surface electrocardiogram; V1, chest lead of body surface electrocardiogram; HRA, high right atrium; HIS, His bundle electrocardiogram; RVOT, right ventricular outflow tract; RVA, right ventricular apex.
