What is the primary complication associated with an IUD in place during intrauterine pregnancy?

The primary complication associated with an intrauterine device (IUD) in place during an intrauterine pregnancy is spontaneous abortion (SAB). When an IUD is retained during pregnancy, there is a higher likelihood of miscarriage or loss of the pregnancy. This is due to the presence of the foreign body in the uterine cavity, which can interfere with the normal implantation and development of the embryo. The uterus may also respond to the device by inducing contractions or changes in its environment that can lead to SAB.

Additionally, while other complications may arise from the presence of an IUD during pregnancy—such as an increased risk of infection due to the foreign body, this risk does not occur as frequently as the risk of miscarriage. The presence of the IUD can also create potential complications in cases where surgical intervention is required for removal, which could further complicate the pregnancy outcome.

In this context, recognizing spontaneous abortion as the primary complication emphasizes the need for careful monitoring and management of pregnant patients with an IUD in place to optimize maternal and fetal health.