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Three examples to demonstrate the complex regional anatomy of the outflow tracts: Top Panel. Angiography is being performed through a catheter engaging the left main coronary artery with a wire advanced into the left anterior descending (LAD) artery. Note the close proximity of catheters advanced to map outflow tract ventricular ectopy from different cardiac chambers. (E, epicardial space; G, great cardiac vein [GCV]; R, right ventricular outflow tract [RVOT]). This patient had a high burden of premature ventricular complexes (PVCs) resulting in left ventricular systolic cardiomyopathy. PVCs were mapped to close proximity of the LAD. After mapping the left ventricular outflow tract (LVOT) and left coronary cusp (LCC) in addition to the aforementioned sites, radiofrequency ablation was performed in the distal GCV, epicardial region, and the LCC with successful elimination of PVCs Source: CATHETER-ABLATIVE TECHNIQUES, Hurst's The Heart, 14e without injury or need for intervention on the LAD. Middle Panel. Anatomic chamber geometry to show the correlative anatomy of the outflow tracts Citation: Fuster V, Harrington Narula J, Eapenultrasound ZJ. Hurst'sand Themapping Heart, 14e; 2017 Available at: http://mhmedical.com/ May 05,left, generated with three-dimensional mappingRA, using intracardiac catheters. AIV, anterior interventricular vein;Accessed: LCC/RCC/NCC, 2017 right, and noncoronary cusps (aortic sinuses of Valsalva); LM, left main coronary artery; LV, left ventricle; LVOT, left ventricular outflow tract; PA, Copyright © 2017 McGraw-Hill Education. rights reserved pulmonary artery; RVOT, right ventricular outflow tract. All PVC focus was mapped and ablated at the commissure between RCC and LCC (maroon spheres). Bottom Panel. Color-coded three-dimensional activation map of outflow tract ectopy with earliest site at the anterior interventricular vein (AIV)-great