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©2013 UpToDate ® Print Email Schematic representation of atrial activation in sinus rhythm and after the maze procedure or the radial approach The normal activation sequence of the left atrium is maintained with the radial approach while it is altered with the Maze procedure. Thick lines represent the surgical incisions and the solid areas represent parts of the atria surgically isolated or excised; dashed lines represent normal conduction pathways between the atrial appendages, the interatrial septum, and the crista terminalis. Arrows indicate the activation sequence. AVN: atrioventricular node; SAN: sinoatrial node; RAA: right atrial appendage; LAA: left atrial appendage; SVC: superior vena cava; IVC: inferior vena cava; PVs: pulmonary veins. Reprinted with permission from the Society of Thoracic Surgeons. Netta T, Cox R, Schuessler RB, et al. Ann Thorac Surg 1999; 67:27.