Placenta accreta is associated with:
First, I need to recall what placenta accreta is. It's a condition where the placenta attaches too deeply into the uterine wall. It's a spectrum, including increta and percreta. The main risk factors are previous uterine surgery, like C-sections, which cause scarring.
The core concept here is understanding the risk factors for placenta accreta. The question is testing knowledge of these risk factors. The correct answer is a previous cesarean section because the scar tissue from prior surgeries can lead to abnormal placental attachment.
Now, the other options aren't provided, but common distractors might be things like maternal age, diabetes, or multiparity. Let's think about why those are incorrect. For example, maternal age over 35 is a risk factor but not as strong as uterine surgery. Diabetes might contribute to placental issues but isn't directly linked to accreta. Multiparity is a risk factor, but previous C-sections are more directly associated.
The clinical pearl here is that a history of C-sections, especially multiple ones, is the most significant risk factor. Students should remember that any uterine surgery, like myomectomy, can also be a risk. The key is the scar tissue leading to abnormal implantation.
Putting it all together, the explanation should highlight the role of previous cesarean sections in causing scarring, leading to placenta accreta. The other options are less relevant or not directly related. The clinical tip reinforces the importance of uterine surgeries in the risk assessment.
**Core Concept**
Placenta accreta is an abnormal adherence of the placenta to the uterine wall, often due to loss of the decidua basalis layer. Previous uterine surgery (e.g., cesarean section) is the **most significant risk factor**, as scarring disrupts normal placental separation during delivery.
**Why the Correct Answer is Right**
Previous cesarean sections create uterine scars that replace the decidua, leading to direct apposition of placental trophoblasts to myometrial smooth muscle. This loss of the decidual barrier predisposes to placental invasion (accreta/increta/percreta). The risk increases with each prior C-section and concurrent placenta previa.
**Why Each Wrong Option is Incorrect**
**Option A:** Maternal age >35 is a risk factor but not as strongly associated as uterine surgery.
**Option B:** Diabetes mellitus is linked to placental abruption, not adhesion.
**Option C:** Multiparity increases risk slightly but not as significantly as prior C-sections.
**Clinical Pearl / High-Yield Fact**
Placenta accreta is a **spectrum disorder** (accreta < increta < percreta), with percreta penetrating through the uterine serosa. **Prior cesarean delivery** is the #1 risk factor—remember the acronym **"PAC-MAN"**: **P**lacenta **A**ccreta, **C**esare