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Abstract
Purpose: The purpose of this study is to evaluate the menstrual profile in users of the etonogestrel (ENG)-releasing implant (Nexplanon®) and the possible correlation with anthropometric variables.
Methods: Ninety-two healthy women, desiring long-term contraception with the ENG implant were enrolled in a prospective observational study. Anthropometric variables were measured at baseline and after 3, 6, 9, and 12 months. Patients recorded daily the occurrence of any bleeding or spotting. The bleeding/spotting pattern was evaluated over consecutive 90-day intervals (“Reference Periods” – RPs). Patients who showed a favourable bleeding profile (amenorrhoea, infrequent, or normal bleeding) for 50% or more of the RPs were assigned to group A, while patients with a favourable bleeding profile for less than 50% of the RPs were assigned to group B.
Results: Sixty-eight women (79%) were assigned to group A; 18 (21%) to group B. Group B had a lower baseline body mass index (BMI) than group A (24.84 ± 4.95 kg/m2 versus 20.75 ± 4.41 kg/m2; p < 0.005).
Conclusions: The ENG sub-dermal implant is a well-tolerated contraceptive method, with a high proportion of women experiencing a favourable bleeding profile. The lower basal BMI in Group B in comparison with Group A may account for the higher percentage of irregular bleeding.
Declaration of interest
Costantino Di Carlo has been a consultant for Merck Sharp and Dohme on several occasions. The other authors report no conflict of interest. The authors alone are responsible for the content and the writing of the paper.