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Randomized study on the effect of the immediate postpartum insertion of the etonogestrel-releasing implant on infant growth

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Lilian Sheila de Melo Pereira do Carmo
Total Authors: 1
Document type: Doctoral Thesis
Press: Ribeirão Preto.
Institution: Universidade de São Paulo (USP). Faculdade de Medicina de Ribeirão Preto
Defense date:
Examining board members:
Silvana Maria Quintana; Viviane Cunha Cardoso; Marcos Felipe Silva de Sá; Érika Zambrano Tanaka
Advisor: Carolina Sales Vieira Macedo

Objective: To evaluate the growth of breastfed children whose mothers had inserted an etonogestrel-releasing implant in the immediate postpartum period. Methods: An open, randomized, controlled, and parallel trial of postpartum women who were block randomized to early (up to 48 hours postpartum before discharge) or conventional (at 6 weeks postpartum) insertion of a etonogestrel implant. The primary outcome was average infant weight at 12 months (360 days), and a difference of >=10% between groups was considered clinically significant. The secondary outcomes were infant\'s lenght, head and arm circumferences. These variables were measured at baseline and at 14 and 40, 90, 180, 270, and 360 days postpartum. The mixed-effects linear regression model was used to evaluate the outcomes, with a power of 80%, and a significance level of 1% for primary outcome and 0.3% for secondary outcomes, due to correction for multiple hypothesis testing. Results: From June to August of 2015, a total of 100 women were randomized to either early or conventional postpartum etonogestrel insertion. Sociodemographic characteristics were similar between the groups, except for educational attainment, which was higher in the conventional insertion group (88% vs. 70% in the early insertion group, p=.02). There was no difference in infant weight at 360 days between the groups [early: (mean ± standard deviation) 10060.3 ±1156.0 g vs conventional: 9812.1 ± 1270.3g, mean difference estimate 321.6g, 95% confidence interval (CI): - 183.5 to 495.7]. The growth curves of the lenght and the curves of the head and arm circumferences did not differ between the groups. Conclusion: There is no difference in growth at 12 months among breastfed infants whose mothers underwent early compared with conventional postpartum insertion of the etonogestrel implant. (AU)

FAPESP's process: 13/13993-8 - Effect of early insertion of the implant releasing etonogestrel on child growth
Grantee:Lilian Sheila de Melo Pereira Do Carmo
Support type: Scholarships in Brazil - Doctorate