Use of Aromatase Inhibitor Before Misoprostol in Medical Termination of Miscarriage

Overview

Abortion is one of the most common complications of pregnancy. Missed abortion is a type of abortions, occurs in 15%-20% of clinically diagnosed pregnancies and is defined as the retention of pregnancy products in the uterus for several days or weeks after death of the fetus.

Various medical and surgical methods have been used to manage missed abortions. Surgical methods include dilatation and curettage, and vacuum aspiration. Because these methods are expensive and involve anesthesia, however, medical methods are generally preferred over surgical methods for abortion. Medical approaches include misoprostol which is a prostaglandin that causes myometrial contractions, cervical softening and dilatation. It is used to induce abortion and labor and to treat atonic postpartum hemorrhage and peptic ulcers. It has the advantage of being cost-effective and stable with a low rate of side effects which has led to it being included in the World Health Organization list of essential medications (2014). Misoprostol is licensed for use to induce miscarriage in Egypt. It has not been licensed to induce labor or miscarriage in certain countries such as Germany, but it is used off-label to induce labor in the UK. Usage of Misoprostol alone has a success rate of between 65 and 93% especially in the early stages of pregnancy. It can also use in combination with other medications such as mifepristone and methotrexate to increase the success rate. Most studies have examined the effect of letrozole plus misoprostol on the abortion of live embryos .Given the significance of specifying an effective and safe method for termination of abortion and the specific features of letrozole, such as its safety, cost-effectiveness, and availability.

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