SOD1 and congestive heart failure: In the group of patients with chronic heart failure, we showed a positive correlation between SOD activity in saliva (both NWS and SWS) and ROS production rate (r = 0.825, p <0.0001 and r = 0.864, p <0.0001, respectively) and negative correlation between Px activity and ROS formation in NWS (r = −0.836, p <0.0001).