Periodontitis and the outcome of atrial fibrillation ablation: Porphyromonas gingivalis is related to atrial fibrillation recurrence

Introduction Inflammation is one of the main causes of atrial fibrillation (AF) recurrence after ablation. Porphyromonas gingivalis is a key periodontal pathogen in the oral–systemic disease connection and serum immunoglobulin G (IgG) antibody titers against P. gingivalis reflect the clinical status of periodontitis. This study aimed to investigate the relationship between late recurrence of AF after radiofrequency catheter ablation (RFCA) and serum IgG antibody titers against P. gingivalis. Methods A total of 596 AF patients (mean age, 64.9 ± 10.0 years; 69% male; 61% paroxysmal AF) who underwent a first session of RFCA were enrolled. Patients were carefully examined for late recurrence during a mean follow‐up period of 17.1 ± 14.5 months. Serum IgG antibody titers against P. gingivalis (types I–IV) were measured using enzyme‐linked immunosorbent assay. The results of serum antibody titers were divided into a high‐value and a low‐value group. Results Among the five P. gingivalis subtypes, serum antibody titer against P. gingivalis type IV was associated with late recurrence (odds ratio, 1.937; 95% confidence interval [CI], 1.301–2.884; p = .002). Multivariate Cox proportional‐hazards regression analysis revealed that high‐value serum antibody titer against P. gingivalis type IV independently predicted late recurrence (paroxysmal AF: adjusted hazard ratio [HR], 1.569; 95% CI, 1.010–2.427; p = .04; non‐paroxysmal AF: adjusted HR, 1.909; 95% CI, 1.213–3.005; p = .004). Conclusion Periodontitis was related to the late recurrence of AF after RFCA. P. gingivalis type IV may be pathogenic for AF recurrence after RFCA.