ENG-releasing subdermal implants in postpartum teenagers - an open-label trial study protocol

One-year follow-up of immediate postpartum contraceptive implant insertion in adolescents

PURPOSE

Our study aimed to evaluate the acceptability, adverse effects and continuation rates among adolescents who accepted the etonogestrel (ENG) subdermal implant and compared to adolescents who chose other methods during the immediate postpartum period before hospital discharge, with one year follow-up up.

MATERIALS AND METHODS

We conducted a cohort non-randomised study at the Women's Hospital, University of Campinas. All women up to 19 years of age, who gave birth at the hospital between July 2019 and April 2020, were invited to participate and were offered the ENG-implant or the routine contraceptive methods. They were followed for one year postpartum.

RESULTS

We included 100 teenagers and 72 accepted the ENG-implant. Students are more likely to accept the ENG-implant than non-students (PR: 1.25 [95%CI 0.99-1.59]). Up to one year of follow-up, survival analysis showed that the time of adherence to the method was longer for the ENG-implant users (p = 0.0049). More than 90% of the adolescents were satisfied with the implant; however, five requested early removal due to menstrual irregularity and local discomfort.

CONCLUSION

Provision ENG-implant for adolescents in the immediate postpartum demonstrated high acceptance and ensured effective contraception. After one year, most of them were satisfied, with a high continuation rate and without unplanned pregnancies.

Safety and Benefits of Contraceptives Implants: A Systematic Review

Progestin-only contraceptive implants provide long-acting, highly effective reversible contraception. We searched the medical publications in PubMed, CENTRAL, and EMBASE for relevant articles on hormonal implants published in English between 1990 and 2021. Levonorgestrel (LNG) 6-capsule subdermal implants represented the first effective system approved for reversible contraception. The etonogestrel (ENG) single rod dispositive has been widely employed in clinical practice, since it is a highly effective and safe contraceptive method. Abnormal menstrual bleeding is a common ENG side effect, representing the main reason for its premature discontinuation. Emerging evidence demonstrated that it is possible to extend the use of the ENG implant beyond the three-year period for which it is approved. The ENG implant could be an effective and discrete alternative to the IUD in young girls, such as post-partum/post-abortion. Implants should be inserted by trained skilled clinicians who previously provide adequate counselling about their contraceptive effect, benefits, and any possible adverse events. More studies are needed to validate the extended use of the ENG implant for up to 5 years.