Comparative assessment of two low-dose oral contraceptives, Lo-Femenal and Lo-Estrin, in Mexican women.

This trial was designed to determine the differences in effectiveness, clinical acceptability, and one-year discontinuation rates of two low-dose oral contraceptives: Lo-Estrin (norethindrone acetate 1.5 mg plus ethinyl estradiol 0.030 mg) and Lo-Femenal (norgestrel 0.30 mg plus ethinyl estradiol 0.030 mg) in 148 Mexican women. In addition, the effects of both oral contraceptive preparations on blood lipids were prospectively evaluated in a subgroup of 41 women. The results indicated that there were no differences in pregnancy rates, discontinuation or clinical acceptability between the two groups. The lipid changes observed were minimal for the Lo-Femenal subgroup and somewhat greater for the Lo-Estrin group, mainly an increase in serum triglycerides. These changes were interpreted as estrogen induced effects of norethindrone-containing oral contraceptives. Overall, the data indicate that both Lo-Femenal and Lo-Estrin are effective and safe combined oral contraceptives.

Assessment of luteal function after surgical tubal sterilization.

To evaluate ovarian luteal function after tubal occlusion, a group of women who underwent Pomeroy sterilization were studied. A prospective group I (n = 16) were followed for one year and scheduled for blood sampling every other day during their luteal phase before surgical procedure and at 3 and 12 months thereafter. Group II (n = 15) included women who were studied during their luteal phase at 1 or 5 years post-surgery. Mid-luteal progesterone and estradiol serum levels were calculated by estimating the average of at least 3 values of serum samples obtained in days 20-25 of a menstrual cycle. The data suggest that no major changes occur in ovarian function after surgical tubal occlusion, as assessed by the mid-luteal hormone serum levels, and underscore the safety of this procedure.