A 27-year-old has just had an ectopic pregnancy. Which of the following events would be most likely to predispose to ectopic pregnancy?
**Core Concept**
Ectopic pregnancy is an embryonic implantation outside the uterus, often in the fallopian tube. The most common risk factor is a previous ectopic pregnancy, but other factors can predispose individuals to this condition. The underlying concept here is the disruption of normal ovulation and fertilization processes.
**Why the Correct Answer is Right**
The correct answer, **tubal ligation**, is a surgical procedure that creates a blockage in the fallopian tube. This blockage can cause the fertilized egg to implant in the tube, as it cannot pass through to reach the uterus. This is because the tubal ligation procedure can lead to tubal damage, scarring, or blockage, creating an environment conducive to ectopic implantation.
**Why Each Wrong Option is Incorrect**
* **Option A:** **Pelvic inflammatory disease (PID)** is a condition that can cause inflammation of the fallopian tubes, but it is not the most direct cause of ectopic pregnancy.
* **Option B:** **IUD (Intrauterine Device)** is a form of contraception that prevents implantation of the fertilized egg in the uterus. However, it does not directly predispose to ectopic pregnancy.
* **Option C:** **Previous abortion** is not a significant risk factor for ectopic pregnancy.
**Clinical Pearl / High-Yield Fact**
Previous ectopic pregnancy is the most significant risk factor for future ectopic pregnancies, with a recurrence rate of approximately 2-10%.
**Correct Answer:** D. Tubal ligation is the most likely event to predispose to ectopic pregnancy.