Which is the most likely complication of IUD ?
**Core Concept**
The intrauterine device (IUD) is a type of long-acting reversible contraceptive that is inserted into the uterus. The most common type of IUD is the copper IUD, which works by releasing ions that damage sperm and prevent fertilization. However, the most likely complication of IUD insertion is due to the physical trauma caused by the procedure.
**Why the Correct Answer is Right**
The most likely complication of IUD insertion is pelvic inflammatory disease (PID), which occurs when bacteria from the vagina or cervix ascend into the uterus, fallopian tubes, or ovaries. This can be triggered by the insertion process itself, which can cause microtrauma to the cervical canal and endometrium, allowing bacteria to penetrate more easily. Additionally, the presence of the IUD can increase the risk of PID by providing a conduit for bacteria to ascend into the upper genital tract.
**Why Each Wrong Option is Incorrect**
**Option A:** Perforation of the uterus is a rare complication of IUD insertion, but it is not the most likely complication.
**Option B:** Menstrual irregularities are a common side effect of IUD use, but they are not a complication of the insertion procedure itself.
**Option C:** Infection is a possible complication of IUD insertion, but it is not the most likely complication; instead, PID is the most common type of infection associated with IUD use.
**Clinical Pearl / High-Yield Fact**
The risk of PID is increased in women with a history of sexually transmitted infections (STIs) or those who are not using condoms consistently. Therefore, it is essential to screen women for STIs before inserting an IUD and to counsel them on the importance of consistent condom use to reduce the risk of PID.
**Correct Answer:** C.