How Does Mirena Work for Fibroids?
Introduction
Mirena is a "T" shaped device that can be placed in the uterine cavity to help prevent pregnancy. Inside the device is a cylinder in which levonorgestrel, a steroidal hormone, resides. Slowly, over time, the device releases approximately 20 μg per day of the hormone into the woman's system. Since levonorgestrel is progestogen, the introduction of the hormone into the system causes the cervical mucus to thicken, making it difficult for sperm to reach and fertilize and egg. It also causes the linings of the uterus to become too thin to be able to accept an egg.
Uterine Fibroids
Uterine fibroids are a common problem seen in women, especially just before menopause. Fibroids are growths that occur in the muscles of the uterus. Fibroids are benign growths, but can cause problems including heavier periods, and, in many cases, may warrant a hysterectomy.
Mirena and Fibroids
Since Mirena needs to be implanted in the uterus, large fibroids can make it nearly impossible to get the Mirena device to stay in place. However, if the fibroids are small enough to still allow the device to remain in place, the hormones released can actually help shrink the remaining fibroids. In fact, in a study by Doctors Sivin and Stern in the Journal of Fertility and Sterility, it was found that women who use Mirena may actually have less chance of developing fibroids, due to the presence of levonorgestrel in their uterine cavity.
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