What does a late deceleration in fetal heart rate typically signify?

• A. Cord compression
• B. Uteroplacental insufficiency
• C. Fetal movements
• D. Lack of maternal oxygen

Answer: (B)

A late deceleration in fetal heart rate is typically indicative of uteroplacental insufficiency. This condition suggests that the placenta is not delivering adequate blood flow or oxygen to the fetus during uterine contractions, which is critical in maintaining a healthy fetal environment. When late decelerations occur, they usually manifest after a contraction has started and can continue to drop in heart rate for some time post-contraction, reflecting a delayed response of the fetal heart rate to the reduced blood flow. This type of fetal heart rate pattern is considered concerning and can signal potential distress, prompting closer monitoring and possibly intervention to improve fetal status.

The other choices present less serious or different conditions; for example, cord compression typically results in variable decelerations rather than late decelerations, while fetal movements would usually be represented by accelerations in heart rate rather than decelerations. Lack of maternal oxygen can lead to changes in fetal heart rate, but it does not specifically denote late decelerations as a clear indicator in the same way as uteroplacental insufficiency does.