fig2

Figure 2. Anatomy of the left and right sinuatrial nodal arteries. (A) High-resolution dissection-enhanced photograph of the left sinuatrial nodal artery (white arrow), which originates from the left circumflex artery and runs along the anterior wall of the left atrium within the Bachmann’s bundle. (B) Multiplanar reconstruction image from the cardiac computed tomography shows the left sinuatrial nodal artery (white arrow) running similar course, suggesting a potential risk of injury of this artery during radiofrequency catheter ablation of the anterior wall of the left atrium. (C) High-resolution dissection-enhanced photograph shows the right sinuatrial nodal artery (white arrow) running between the right atrial appendage and the aortic root. Note that epicardial fat filling this region was thoroughly removed to expose this artery. (D) Multiplanar reconstruction image from the cardiac computed tomography shows the right sinuatrial nodal artery (white arrow) running similar course, suggesting a potential risk of injury of this artery during radiofrequency catheter ablation of the medial wall of the right atrial appendage. L: left coronary aortic sinus; N: non-coronary aortic sinus; R: right coronary aortic sinus.