Anatomy of the left main coronary artery of particular relevance to ablation of left atrial and outflow tract arrhythmias

The LMCA is often intimately related to the anterior left atrium, left atrial appendage base, and pulmonary artery and occasionally to the inferior part of the left aortic sinus of Valsalva and thus is exposed to the risk of injury during ablation in these areas. The LMCA is rarely close to the right ventricular outflow tract.