title: Effects of Mirena (levonorgestrel-releasing intrauterine system) and Ortho Gynae T380 intrauterine copper device on lipid metabolism--a randomized comparative study.
abstract: BACKGROUND
  This 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.
  
  
  METHODS
  Ninety-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.
  
  
  RESULTS
  There 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.
  
  
  CONCLUSIONS
  In 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.
authors.affiliation: Department of Obstetrics and Gynaecology, National University Hospital, Singapore 119074, Singapore.
authors.forename: Ying Woo
authors.initials: YW
authors.lastname: Ng
authors.forename: Shen
authors.initials: S
authors.lastname: Liang
authors.forename: Kuldip
authors.initials: K
authors.lastname: Singh
mesh_terms: D000328:Adult; D016632:Apolipoprotein A-I / Q000378:metabolism; D001055:Apolipoproteins B / Q000097:blood; D002784:Cholesterol / Q000097:blood; D008076:Cholesterol, HDL / Q000097:blood; D008078:Cholesterol, LDL / Q000097:blood; D003271:Contraceptive Agents, Female / Q000009:adverse effects / Q000494:pharmacology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007435:Intrauterine Devices, Copper; D007436:Intrauterine Devices, Medicated; D016912:Levonorgestrel / Q000009:adverse effects / Q000494:pharmacology*; D050356:Lipid Metabolism / Q000187:drug effects*; D008055:Lipids / Q000097:blood*; D014280:Triglycerides / Q000097:blood; D055815:Young Adult
chemical_list: D016632:Apolipoprotein A-I; D001055:Apolipoproteins B; D008076:Cholesterol, HDL; D008078:Cholesterol, LDL; D003271:Contraceptive Agents, Female; D008055:Lipids; D014280:Triglycerides; D016912:Levonorgestrel; D002784:Cholesterol