IL6 and congestive heart failure: In patients with CHF, TNF-α correlated positively with malondialdehyde (P = 0.014, r = 0.474) and negatively with GPX (P = 0.026, r = − 0.453), and interleukin-6 correlated negatively with GPX (P = 0.046, r = − 0.412).