Figure 5: Concentration of plasma norepinephrine (NE) (A) and epinephrine (E) (B) in control dogs, and dogs with RF CHF, and CHF and RF in combination. *P<0.05 vs. control, **P<0.01 vs. control, +P<0.05 vs. RF, ++P<0.01 vs. RF. P<0.05 vs. CHF. There were 5 dogs in each group.