Additionally, the mean duration of the AF episode was longer in the mice with AAC than in the sham mice (0.62 ± 0.62s vs 9.363 ± 2.394s, P < .05; Figure 1C), whereas AAV9‐CYP2J2 treatment decreased the duration time of AF (1.108 ± 0.5902s). This evidence concerns the gene CYP2J2 and atrial fibrillation.