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©2013 UpToDate ® Print Email A schematic representation of the anatomic distribution of focal atrial tachycardias The atrioventricular valvular annuli have been removed. %: percent; CS: coronary sinus; CT: crista terminalis; LA: left atrium; LAA: left atrial appendage; MA: mitral annulus; PV: pulmonary vein; RA: right atrium; RAA: right atrial appendage; TA: tricuspid annulus. Reproduced with permission from: Kistler, PM, Roberts-Thomson, KC, Haqqani, HM, et al. P-wave morphology in focal atrial tachycardia: development of an algorithm to predict the anatomic site of origin. J Am Coll Cardiol 2006; 48:1010. Copyright ©2006 Elsevier.