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Figure 2 (A) Before administration of phenylephrine, the minimal coupling interval of atrial fibrillation (AF) burst originating in the RSPV was 120 ms. (B) After administration of phenylephrine, the minimal coupling interval of AF burst was prolonged to 172 ms. CSD = distal coronary sinus; CSM = middle coronary sinus; CSO = ostial coronary sinus; HRA = high right atrium; RSPV = right superior pulmonary vein.
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