A randomized single-blind clinical study was performed to determine whether there was any difference in the termination event rates between parous women using the Ypsilon-Y intrauterine device (IUD) and those using the Lippes loop D. A total of 174 women received the Ypsilon-Y IUD and 173 women received the loop D. A significant higher incidence of expulsion occurred with use of the Ypsilon-Y IUD.
PIP: A randomized single-blind study was performed to determine whether there was any difference in the termination event rates between parous women using the Ypsilon-Y IUD and those using the Lippes loop D. 174 women (mean age, 25.7; mean parity, 2.4) received the Ypsilon-Y and 173 women (mean age, 25.6; mean parity, 2.7) received the Lippes loop. There were 939 total woman-months of experience with the Ypsilon-Y and 977 with the Lippes loop. A significantly higher incidence of expulsion occurred with use of the Ypsilon-Y, 30 cases vs. 7 for the Lippes loop. 16 of the expulsions of the Ypsilon-Y went unnoticed by the user. Despite a lower rate of termination because of pain and bleeding, the high expulsion rate, confirmed in other studies, indicates that the Ypsilon-Y is not an improved model of IUD.