CCN5 and Arrhythmia: At the cut‐off pacing frequency of 22 Hz, sustained atrial pacing‐induced arrhythmia was generated in 75% of AAV9‐VLP–treated AngII hearts compared to only 25% of AAV9‐CCN5–treated AngII and 12.5% of sham hearts (Figure 4D, Table S2).