Kristina Bardenheuer

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OBJECTIVES The "International Active Surveillance Study of Women Taking Oral Contraceptives" investigated the risks of short- and long-term use of an extended 24-day regimen of drospirenone and ethinylestradiol (DRSP24d) compared to established oral contraceptives (OCs) in a routine clinical setting. STUDY DESIGN Prospective, controlled, noninterventional(More)
OBJECTIVE To estimate real-life effectiveness of oral contraceptive pills by progestogen, length of pill-free interval, and body mass index while focusing on the effect of progestogens with a long half-life and on 24-day oral contraceptive pills regimens. METHODS Outcome data from 52,218 U.S. participants in the International Active Surveillance of Women(More)
BACKGROUND This study compares the risk of breast cancer for levonorgestrel-releasing intrauterine devices (LNG(IUD)) versus copper IUDs (CU(IUD)) in women younger than 50 years of age. STUDY DESIGN Retrospective, population-based, case-control study using cancer registers in Finland and Germany, powered to exclude a 1.5-fold risk of breast cancer. (More)
BACKGROUND A 24-day regimen of contraceptive doses of drospirenone and ethinylestradiol (DRSP/EE 24d) was recently launched. This regimen has properties which may be beneficial for certain user populations (e.g., women suffering from premenstrual dysphoric disorder or acne). However, it is unknown whether this extended regimen has an impact on the(More)
OBJECTIVES To compare incidence rates of serious cardiovascular events, particularly arterial thromboembolic events (ATE), in users of hormone replacement therapy (HRT), particularly oral continuous combined preparations. METHODS Prospective, controlled cohort study with four arms: women using (1) drospirenone (DRSP)/estradiol, (2) other oral continuous(More)
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