PRF1 and atrial fibrillation: Moreover, we compared the percentage of CFP between PFP-AF and PFP-SR: CFP was found at a significantly higher proportion of PFP-SR sites than sites displaying PFP-AF (in PFP-SR: 80%, Q1–Q3: 61.88–89.17% vs. in PFP-AF: 58.6% CFP, Q1–Q3: 48.86–81.39%, p = 0.008).