Human Reproduction Unit, Department of Obstetrics and Gynecology, School of Medical Sciences and National Institute of Hormones and Women's Health, University of Campinas, Campinas, SP, Brazil.
Int J Gynaecol Obstet. 2011 Apr;113(1):50-3. doi: 10.1016/j.ijgo.2010.10.013. Epub 2011 Jan 26.
To evaluate the correlation between endometrial cavity length and expulsion rate in acceptors of the TCu380A intrauterine device (IUD) or the levonorgestrel-releasing intrauterine system (LNG-IUS).
The study included 235 nulligravida and parous women who received a TCu380A IUD or LNG-IUS and who were observed for up to 1 year. The length of the uterine cavity was measured by uterine sounding and ultrasonography.
The endometrial cavity was shorter than 3.2 cm in 2 LNG-IUS users and at least 3.2 cm long in 87 LNG-IUS users, with expulsions occurring in 0 (0.0%) and 2 (2.3%) of these women, respectively (P>0.999). Among the TCu380A IUD users, the endometrial cavity was shorter than 3.6 cm in 63 women and at least 3.6 cm long in 83 women, with expulsions occurring in 3 (4.8%) and 5 (6.0%) of these women, respectively (P>0.999). The mean length of the endometrial cavity-evaluated via ultrasonography-among the 10 women whose devices were expelled was 3.9 ± 0.3 cm, compared with 3.9 ± 0.0 cm in those who retained their devices (P=0.799).
The present results do not support the hypothesis of an association between uterine length and risk of intrauterine contraceptive expulsion.
评估接受 TCu380A 宫内节育器（IUD）或左炔诺孕酮释放宫内节育系统（LNG-IUS）的使用者的宫腔长度与排出率之间的相关性。
本研究纳入了 235 名初产妇和经产妇，她们均接受了 TCu380A IUD 或 LNG-IUS，并观察了长达 1 年。通过子宫探测和超声测量宫腔长度。
2 名 LNG-IUS 使用者的宫腔长度小于 3.2cm，87 名 LNG-IUS 使用者的宫腔长度至少为 3.2cm，这两组中分别有 0（0.0%）和 2（2.3%）名使用者发生脱落（P>0.999）。63 名 TCu380A IUD 使用者的宫腔长度小于 3.6cm，83 名 TCu380A IUD 使用者的宫腔长度至少为 3.6cm，这两组中分别有 3（4.8%）和 5（6.0%）名使用者发生脱落（P>0.999）。脱落的 10 名使用者的宫腔超声评估平均长度为 3.9±0.3cm，而保留节育器的 95 名使用者的宫腔长度为 3.9±0.0cm（P=0.799）。
本研究结果不支持宫腔长度与宫内节育器脱落风险之间存在关联的假设。
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