Effects of Mirena (levonorgestrel-releasing intrauterine system) and Ortho Gynae T380 intrauterine copper device on lipid metabolism—a randomized comparative study

BackgroundThis study aims to assess the effects of levonorgestrel-releasing intrauterine system (LNG-IUS) on lipid metabolism in an Asian population using Ortho Gynae T380 copper containing (nonhormonal) intrauterine device (IUD) as a control.Study DesignNinety-two healthy women requesting IUD for contraception were randomly allocated to the two groups and were followed up at 6-, 12- and 18-month intervals. Serum concentrations of total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), triglycerides (TG), apolipoprotein A-I (Apo A-I) and apolipoprotein B were measured pre insertion and at each visit following insertion.ResultsThere was a marginally significant reduction in TC level in the LNG-IUS group. HDL-C showed a significant reduction in the LNG-IUS group at 6 months but reverted back to its preinsertion value by 1 year. TG, LDL-C and the cholesterol ratios remained stable. Levels of Apo A-I and B also showed no significant reduction in both groups, and their ratios remained stable and insignificant.ConclusionIn this randomized comparative study among our local Asian population, it is assuring to note that the LNG-IUS does not have any adverse effects on lipid metabolism.