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. 2015 Jun 6;1(5):379–381. doi: 10.1016/j.hrcr.2015.05.002

Figure 2.

Figure 2

A: Simultaneous recordings of surface ECG leads II, III, and V1 and intracardiac coronary sinus (CS) and persistent left superior vena cava (PLSVC) electrograms during sinus rhythm after PLSVC isolation. The circular mapping catheter is positioned within the PLSVC. Note the complete absence of PLSVC potentials compared with the baseline recording during the first 2 beats in Figure 1A. B: Pacing is performed from the ablation catheter (Map 1–2) positioned in the left atrial appendage (LAA). The potentials recorded on the circular mapping catheter immediately follow the stimulus artifact on the anterior bipoles (arrows), confirming that these potentials represent LAA far-field signals. C: Shown is a fluoroscopic image of the circular mapping catheter positioned in the PLSVC in front of the LAA, the CS catheter, and the ablation catheter within the CS during AT ablation. Bipoles 3–4, 15–16, and 17–18 are anterior and close to the LAA (arrows). D: An angiographic image (anteroposterior view) of the CS and PLSVC is depicted.