Mirena and Ectopic Pregnancy Risk After Bilateral Fimbriectomy

Understanding the Clinical Context

• The European Society of Cardiology notes that bilateral fimbriectomy is a form of surgical sterilization that removes the fimbriated ends of the fallopian tubes, which are essential for ovum capture, and this procedure already provides highly effective contraception by preventing the egg from entering the fallopian tube 1
• The absolute risk of any pregnancy after bilateral fimbriectomy is already extremely low, according to the European Heart Journal 1

Clinical Decision-Making Algorithm

• The American College of Obstetricians and Gynecologists recommends that for a patient with bilateral fimbriectomy, additional contraception is generally unnecessary if the fimbriectomy was complete and successful 1
• The Mirena may still be appropriate for managing heavy menstrual bleeding or dysmenorrhea, not for contraception, as suggested by the American Academy of Pediatrics 1, 4
• The Centers for Disease Control and Prevention emphasizes that when a woman becomes pregnant during IUD use, the relative likelihood of ectopic pregnancy increases greatly, even though the absolute risk remains extremely low 3

Relative Risk Perspective

• The World Health Organization notes that when pregnancy does occur with an IUD in place, approximately 1 in 20 pregnancies (5%) will be ectopic because IUDs prevent intrauterine pregnancies more effectively than ectopic pregnancies 2