Abstract
The simultaneous increase of antioxidant CAT (catalase) enzyme and plasma MDA (malonidialdehyde) concentrations versus the numeric rating scale (NRS) pain score following surgery is unknown. Patients and Methods: The study included 114 patients with gallstone disease and 29 patients in the cancer group. Following surgery, the plasma CAT concentrations increased and plasma MDA concentrations decreased in all patients and especially in cancer patients. The linear mixed model time-effect was statistically significant in CAT and MDA (p<0.001 and p=0.02, respectively). In addition, a significant correlation between NRS pain score values and plasma MDA median concentrations in cancer patients was identified (r=0.430, p<0.001). The plasma MDA concentrations decreased and CAT concentrations increased significantly in all patients and especially in cancer patients following surgery. The simultaneous increase of antioxidant CAT enzyme with the decrease of plasma MDA may be an important ROS inhibiting mechanism to help patients return to normal antioxidant-oxidant status.
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