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Hormonal changes associated with bleeding during low dose progestogen contraception delivered by Norplant subdermal
A Faúndes1, F Alvarez-Sanchez, V Brache
1Department of Obstetrics and Gynecology, Faculty of Medical Sciences, Universidade Estadual de Campinas, Brazil.
Advances in Contraception : the Official Journal of the Society for the Advancement of Contraception
|March 1, 1991
Summary
Norplant implants disrupt menstrual bleeding by altering ovarian hormone levels. Estradiol (E2) and progesterone (P) patterns correlate with various bleeding irregularities, indicating continued hormonal influence on the endometrium.
Area of Science:
- Reproductive Endocrinology
- Contraception Research
- Gynecological Health
Background:
- Norplant subdermal implants are a progestin-only contraceptive method.
- Disruption of menstrual bleeding patterns is a common side effect of Norplant use.
- Understanding hormonal changes is crucial for managing Norplant-related bleeding irregularities.
Purpose of the Study:
- To investigate the relationship between menstrual bleeding patterns and hormonal fluctuations (estradiol and progesterone) in women using Norplant.
- To analyze hormonal profiles associated with normal, oligomenorrheic, amenorrheic, irregular/frequent, and prolonged bleeding patterns.
- To determine if ovarian hormones continue to influence endometrial shedding despite Norplant use.
Main Methods:
- Analysis of estradiol (E2) and progesterone (P) levels in 103 cycles from 82 women using Norplant implants.
- Categorization of bleeding patterns into five defined types: normal, oligomenorrhea, amenorrhea, irregular/frequent, and prolonged bleeding.
- Correlation of hormonal profiles (E2 and P) with observed bleeding patterns, including luteal activity and E2 levels.
Main Results:
- Normal bleeding cycles showed a characteristic rise and fall in E2, with progesterone changes in half of the cycles.
- Oligomenorrheic cycles exhibited similar hormonal patterns to normal cycles, but with less frequent progesterone activity.
- Amenorrheic cycles were characterized by absent luteal activity and often persistently low E2 levels.
- Irregular/frequent bleeding was associated with low E2 levels and lack of luteal activity in most cases.
- Prolonged bleeding showed varied E2 levels, with some cases occurring despite normal E2 ranges.
Conclusions:
- Ovarian hormone fluctuations, particularly estradiol, continue to play a role in endometrial shedding even with Norplant contraceptive implants.
- Specific hormonal profiles are associated with different types of menstrual bleeding disturbances observed during Norplant use.
- Further research into hormonal regulation can inform strategies for managing Norplant-associated menstrual irregularities.