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Experimental preparation. A: Endocardial view of right atrial preparation with important structures labeled. Colored asterisks indicate locations of representative optical signals. B: Activation map during sinus rhythm before ablation. C: Representative optical signals from colored asterisks. RAA: right atrial appendage; CT: crista terminalis; IVC: inferior vena cava; SVC: superior vena cava; RV: right ventricle.
