title: [Clinical study on women with amenorrhea after levonorgestrel intrauterine system].
abstract: OBJECTIVE
  To study the 5 years contraceptive efficacy of levonorgestrel intrauterine system (LNG-IUS) and the ovarian functions in amenorrhea women.
  
  
  METHODS
  LNG-IUS and TCu 380A IUD were randomly inserted in 2 groups of women, 50 each. Women were followed annually for 5 years. Serum follicle stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), estradiol (E2), and T levels in 14 women with amenorrhea, and endometrial biopsies were obtained in 9 cases.
  
  
  RESULTS
  By the end of 5 years, there were 2 pregnancies in TCu 380A group, but none in LNG-IUS group; and 24 amenorrhea cases in LNG-IUS. The 5 year cumulative continuation rates were 24% for LNG-IUS and 78% for TCu 380A (P < 0.001). In the 14 women with amenorrhea, the average serum concentrations were not significantly different from that of the normal controls. Histological study showed endometrial atrophy or a few secretory glands.
  
  
  CONCLUSIONS
  LNG-IUS is a highly effective and safe contraceptive measure. Oligomenorrhea and amenorrhea caused by the local effects of LNG were reversible and did no harm to women's health. However, comprehensive consultation provided to women before insertion is of utmost importance for continuation use.
authors.affiliation: Department of Obstetrics and Gynecology, Beijing Chaoyang Hospital, Capital University of Medical Science, Beijing 100020, China.
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: L
authors.initials: L
authors.lastname: Weng
mesh_terms: D000328:Adult; D000568:Amenorrhea / Q000139:chemically induced*; D003257:Consumer Product Safety; D003271:Contraceptive Agents, Female / Q000009:adverse effects*; D004717:Endometrium / Q000473:pathology; D005260:Female; D006801:Humans; D007434:Intrauterine Devices; D016912:Levonorgestrel / Q000009:adverse effects*; D008598:Menstruation / Q000187:drug effects; D011247:Pregnancy; D045167:Progesterone Congeners / Q000009:adverse effects*; D013997:Time Factors
chemical_list: D003271:Contraceptive Agents, Female; D045167:Progesterone Congeners; D016912:Levonorgestrel