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SINGAPORE MEDICAL JOURNAL. 1989 Aug; 30(4):390-2.In the 1980s, a study showed an association between IUD use and pelvic inflammatory disease (PID) and subsequent infertility. About the same time, 2 major manufacturers of IUDs stopped making IUDs. These 2 events caused a decline in IUD use worldwide. In Singapore, however, the decline began in the 1960s when the Family Planning Board withdrew the IUD from its 5 year plan. After that, researchers in Singapore 1st conducted randomized prospective trials of most new IUDs. For example in the late 1980s, they began a prospective trial of the MLCu380 with a complicated insertion system. Multicenter trails have demonstrated that at least 5 of the newest copper IUDs have a failure rate of <2/100 woman years and <1/100 for 3 other new copper IUDs. Some manufacturers have increased the area of exposed copper from 200-250mm to 375-380mm to increase efficacy, but a prospective trial in Singapore did not show an increase. A large multicenter trial has shown that the levonorgestrel releasing IUD (LNg20) has a very low failure rate (.12/100) and reduces menstrual loss, unlike the copper IUDs. Due to legal concerns over the medical grade plastic, however, the manufacturer stopped distributing it in the late 1980s. WHO hoped to identify a manufacturer for the plastic so further trials could begin around 1991. In the late 1980s, WHO studied the silver cored copper wire IUD used to prevent fragmentation. Since IUDs change the endometrium which suppresses intrauterine pregnancies but not extrauterine pregnancies, the risk of an ectopic pregnancy is 10 times that of a nonuser. The risk is lower in copper IUDs suggesting that copper ions reduce the chance of fertilization in the Fallopian tubes. The risk of PID in IUD users ranges from 1.5-2.6. The majority of IUD associated PID occurs within 4 months following insertion and in nulliparous patients with several sexual partners.
A randomized comparative study of interval insertion of three intrauterine devices: the copper T 220c, the Nova T and the WHO levonorgestrel 2 ug IUD.
[Unpublished] 1985 May. 5 p. (Project: 82901)The objective is to compare the effectiveness and acceptability of 3 IUDs inserted in 300 health women, aged 24-38. All have had at least 1 full-term delivery. Subjects were randomly allocated to 1 of the 3 IUDS: the Copper T 220C (Tcu 220c), the Nova T, and the World Health Organization levonorgestrel 2 ug IUD. Insertion was done from the 3rd to the 5th day of menstruation between Feb. and Sept. 1984 and followed up at 48 hours, 3, 6, 12, and 24 months after IUD insertion. 12 month data was collected for cumulative rates, based on life table procedures and analyzed with log-rank test. There was no loss to follow up and no insertion failure. All levonorgestrel IUDs have been removed because the levonorgestrel-releasing IUD has a relatively high risk of ectopic pregnancy. The use-related discontinuation rates of Tcu 220c, Nova T, and levonorgestrel IUD during 12 months of use, were 11.1, 2.4, and 12.7, respectively. The difference between Tcu 220c and Nova T were statistically significant (p.<0.01). The continuation rates of Tcu 220c, Nova T, and levonorgestrel during 6 months of use were 94.0, 99.0, and 96.0, respectively. During 12 months of use, they were 88.9, 97.6, and 87.3 respectively. 1 ectopic pregnancy occurred with the levonorgestrel IUD after 7 months of use. No pregnancy occurred in Nova T users. The pregnancy rates of Tcu 220c and levonorgestrel IUD during 12 months of use were 1.0 and 1.3, respectively. Removal rates for bleeding with Tcu 220c and levonorgestrel IUD during 12 months of use were 3.1 and 1.0, respectively. The removal rate for pain with Tcu 220c during 12 months of use was 2.0. The duration of bleeding and spotting with 3 IUDs, 3, 6, 9, and 12 months of use are illustrated. Preliminary results show that the Nova T is superior to Tcu 220c and levonorgestrel IUDs. Expulsion is the main event in both Nova T and Tcu 220c. More attention should be paid to the insertion technique. The duration of bleeding and spotting of levonorgestrel IUD were longer in the last 3 months after insertion, but was shortest at 1 year of use when compared with Tcu 220c and Nova T.