If uteroplacental function is impaired to 50%, what happens to the fetus?

If uteroplacental function is impaired to 50%, what happens to the fetus?

• A. Increased oxygen transfer
• B. Oxygen and CO2 transfer decrease leading to fetal compromise
• C. Fetal brain growth accelerates
• D. Placental shedding occurs

Answer: (B)

Uteroplacental function provides the route for oxygen to reach the fetus and for fetal carbon dioxide to be removed. When this function is impaired to 50%, the placenta can no longer maintain adequate gas exchange. Oxygen transfer to the fetal circulation decreases, and carbon dioxide removal is reduced as well, leading to fetal hypoxia and potential hypercapnia. This state puts the fetus at risk for distress and compromise. The other options don’t fit because they imply improved gas exchange, accelerated brain growth, or a separate placental event that isn’t a direct result of reduced gas transfer.

Uteroplacental function provides the route for oxygen to reach the fetus and for fetal carbon dioxide to be removed. When this function is impaired to 50%, the placenta can no longer maintain adequate gas exchange. Oxygen transfer to the fetal circulation decreases, and carbon dioxide removal is reduced as well, leading to fetal hypoxia and potential hypercapnia. This state puts the fetus at risk for distress and compromise. The other options don’t fit because they imply improved gas exchange, accelerated brain growth, or a separate placental event that isn’t a direct result of reduced gas transfer.