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. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Card Electrophysiol Clin. 2015 Mar 1;7(1):17–35. doi: 10.1016/j.ccep.2014.11.013

Figure 14.

Figure 14

Focal left atrial tachycardia. (A) A 12-lead electrocardiogarm of clinical tachycardia. (B) an ishochronal activation electrocardiomap of a basal left atrial appendage source centrifugal AT. The morphology of the virtual unipolar electrogram at the source displays typical QS morphology. (C) Intracardiac electrograms from the lateral left atrium and coronary sius recorded during ablation of the left atrial source centrifugal AT. (D) Postero-anterior fluoroscopic image showing the location of intracardiac catheters. LAA = left atrial apendage; MA = mitral annulus; RAA = right atrial appendage; SVC = superior vena cava; TA = tricuspid annulus. (From Shah AJ, Hocini M, Xhaet O, et al. Validation of novel 3-dimensional eletrocardiographic mapping of atrial tachycardias. Invasive mapping and ablation. A multicenter study. J Am Coll Cardiol 2013:62-889-97; with permisson)