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. Author manuscript; available in PMC: 2012 Sep 4.
Published in final edited form as: Heart Rhythm. 2012 Mar 28;9(9):1436–1439. doi: 10.1016/j.hrthm.2012.03.055

Figure 1.

Figure 1

Right atrial FIRM mapping and ablation during AF. A: Basket and ablation catheters in the right atrium during AF (anteroposterior fluoroscopy). B: Counterclockwise rotor in posterolateral right atrium centered over C3, with collision beyond the spiral arms (indicated by white double lines; supplementary movie). C: Electrograms around the RA rotor site, indicating counterclockwise rotation with variability at CL ≈ 177 ms. D: FIRM ablation at RA rotor terminates AF to sinus rhythm within 30 seconds. ABL = ablation electrogram; AF = atrial fibrillation; CL = cycle length; CSP = proximal coronary sinus; FIRM = focal impulse and rotor modulation; RA = right atrial.