Examples of noninvasive ECGI isochrones maps for localization of VT site of origin.
Epicardial isochrone maps are shown for four patients with earliest epicardial activation
marked with an asterisk. EP study-determined sites of origin are indicated under the ECGI
maps. Yellow arrows point to VT origin on a representative CT scan. RA, right atrium; LA,
left atrium; AO, aorta; LAD, left anterior descending coronary artery; LV, left ventricle:
RVOT, right ventricular outflow tract. (From Wang Y, Cuculich PS, Zhang J, Desouza KA,
Vijayakumar R, Chen J, Faddis MN, Lindsay BD, Smith TW, Rudy Y. Noninvasive
electroanatomic mapping of human ventricular arrhythmias with electrocardiographic imaging
(ECGI). Science Transl Med 2011;3:1–10; with permisson.)