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Figure 3 Example of a successful ablation of an idiopathic ventricular tachycardia from the aortic sinus of Valsalva. (A) The endocardial electrogram recorded from the ablation catheter precedes the QRS complex by 55 ms. The bipolar electrogram at the successful ablation site shows a split aortic part (AO) and left ventricular part (LV) presenting a slight conduction delay from the aorta to the left ventricular myocardium. Other abbreviations as in Figure 2. (B) Left ventricular outflow tract electroanatomic activation map including the aortic sinus of Valsalva during idiopathic ventricular tachycardia is shown, with red color indicating the earliest activation time. The tip of the ablation catheter is located at the successful ablation site in the aortic sinus of Valsalva. (C and E) The radiograms show the ablation catheter (ABL) at the successful ablation site in the non-coronary cusp. (D and F) The aortogram show the aortic sinus of Valsalva with schematically highlighted coronary arteries. AV = aortic valve area; LAD = left anterior descending artery; LCX = left circumflex artery; LM = left main coronary artery; PA = pulmonary artery; RCA = right coronary artery. Other abbreviations as in Figures 2 and 3.
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