Which of the following statements concerning placenta pre is TRUE?
**Core Concept**
Placenta previa is a condition characterized by the abnormal implantation of the placenta in the lower uterine segment, leading to bleeding during pregnancy. This condition is often associated with placental abruption, preterm labor, and fetal growth restriction.
**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of placenta previa. In this condition, the placenta is implanted in the lower uterine segment, which is a non-supportive area for placental growth. This can lead to separation of the placenta from the uterus, resulting in bleeding. The bleeding is often painless and heavy, which can lead to significant blood loss and potential complications for both the mother and the fetus.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the pathophysiology of placenta previa. While placenta previa is associated with bleeding, it is not a result of uterine contractions.
**Option B:** This option is incorrect because it does not accurately describe the location of the placenta in placenta previa. The placenta is not implanted in the upper uterine segment in this condition.
**Option C:** This option is incorrect because it does not accurately describe the symptoms of placenta previa. While vaginal bleeding is a symptom of placenta previa, it is not a result of uterine contractions.
**Clinical Pearl / High-Yield Fact**
Placenta previa is a condition that requires immediate medical attention, as it can lead to significant blood loss and potential complications for both the mother and the fetus. In cases of suspected placenta previa, a healthcare provider may perform a transvaginal ultrasound to confirm the diagnosis and determine the best course of treatment.
**Correct Answer: C. Vaginal bleeding is the most common symptom of placenta previa.**