[The low dosis gestagen therapy (author's transl)]

Area of Science:

• Endocrinology
• Reproductive Medicine
• Pharmacology

Background:

• Investigated hormonal profiles in young women (22-34 years) on continuous lynestrenol therapy (0.5 mg/day).
• Assessed estradiol, progesterone, and FSH in plasma, and LH excretion in urine.
• Examined ovarian and tubal tissues to understand luteal phase alterations.

Observation:

• Lynestrenol therapy presented diverse hormonal patterns, from ovulatory to anovulatory.
• Estradiol levels increased in half of the patients compared to pre-treatment cycles.
• Progesterone levels were initially decreased but normalized in later cycles.
• Ovarian morphology remained unchanged, but ovulation was histologically delayed.
• Tubal epithelium showed decreased secretory activity and increased ciliogenesis.

Findings:

• Low-dose lynestrenol can lead to ovulatory and anovulatory hormonal profiles.
• Initial progesterone reduction is often temporary, with levels normalizing over time.
• Histological analysis confirms delayed ovulation and altered tubal epithelium function.
• Adverse reactions were minimal, primarily cycle disturbances; strict adherence is key.

Implications:

• Continuous lynestrenol therapy requires careful monitoring of hormonal fluctuations.
• Understanding ovulation delay and tubal changes is important for assessing contraceptive efficacy.
• Patient education on consistent daily intake, particularly at midday, is vital for mini-pill effectiveness.