(A) Overlapped CaT traces of four recording locations among three groups. (B) For four sites, intuitionistic heat maps of the recovery ratio of CaT with the decreased S2 intervals in three groups. (C) Depiction of recovery ratio of CaT at the integral level, (n=4) per group, ^#P<0.05 vs. control group; *P<0.05 vs. bisoprolol group. (D) Plotting of COV-recovery ratio of CaT, (n=4) per group, ^#P<0.05 vs. control group; *P<0.05 vs. bisoprolol group.