Comparisons of ERPs among the four groups. (A) Right ventricular ERPs at 2 and 10 times the pacing threshold. (B) Left ventricular ERPs at 2 and 10 times the pacing threshold. (C) Right atrial ERPs at 2 and 10 times the pacing threshold. (D) Left atrial ERPs at 2 and 10 times the pacing threshold. ERP, effective refractory periods; HF, heart failure; HFD, high-fat diet; RDN, renal denervation. *P<0.05 vs. Control, **P<0.01 vs. Control and #Pā<ā0.05 vs. HFD.