Copper and levonorgestrel containing intrauterine devices: comparison of their effect on oxidative stress markers.

We aimed to evaluate the oxidative stress by measuring the thiol-disulfide balance in women who use either T380A or LNG-IUD as a contraceptive method. The study included two groups; 30 women with LNG-IUD and 30 women with copper-IUD. Thiol-disulfide homeostasis as a marker of oxidative stress was analyzed before the IUD insertion and on the 6 month after insertion. The LNG-IUD group had similar native thiol levels with Cu-IUD (293.1 ± 43.5 µmol/l vs. 290.4 ± 42.4 µmol/l respectively,  = 819). In the copper-IUD group total thiol levels were higher than LNG-IUD group (345.5 ± 58.2 µmol/l vs. 319.5 ± 52.4 µmol/l,  = .031). A significant increase was observed after 6 months in LNG-IUD patients in terms of disulfide/native thiol (7.9 ± 4.4% vs. 11.2 ± 2.6%,  = .006), disulfide/total thiol (6.2 ± 1.8% vs. 8.7 ± 1.9%,  = .004) and Native thiol/total thiol (87.1 ± 12.1% vs. 82.3 ± 8.2%,  = .004) levels. After 6 months in copper-IUD patients, disulfide (22.3 ± 7.3 µmol/l vs. 27.5 ± 6.9 µmol/l respectively,  = .006), disulfide/native thiol (7.7 ± 3.8% vs. 9.8 ± 2.4% respectively,  = .007), disulfide/total thiol (6.4 ± 2.03% vs. 8.2 ± 1.8% respectively,  = .007) and native thiol/total thiol (86.3 ± 9.4% vs. 83.8 ± 10.6% respectively,  = .007) levels were increased. An increase in oxidative stress markers were observed in both groups. Studies evaluating the long term subclinical risks of IUD's are needed to understand the outcomes of the increased oxidative stress.