Which of the following is NOT a characteristic of reassuring FHR patterns?

• A. Baseline fetal heart rate between 110-160
• B. Moderate variability
• C. Absent variable decelerations
• D. Regular late decelerations

Answer: (D)

The correct choice identifies regular late decelerations as not characteristic of reassuring fetal heart rate (FHR) patterns. In a healthy fetal heart rate pattern, one would expect to see variability and absence of decelerations that could indicate fetal distress. Regular late decelerations, on the other hand, are concerning because they suggest that the fetus may be experiencing compromised oxygenation, typically related to issues such as uteroplacental insufficiency.

In contrast, reassuring FHR patterns are defined by specific characteristics that indicate a well-oxygenated fetus. A baseline fetal heart rate between 110-160 beats per minute indicates that the fetus is in a normal range, which is important for the overall assessment of fetal health. Moderate variability reflects a healthy neurological system and fetal well-being, as it shows that the fetal heart rate is responding appropriately to the fetus's movements and conditions. The absence of variable decelerations also signals that the fetus is not experiencing cord compression or other stressful events during labor and delivery, which can lead to a reduction in oxygen supply.

Therefore, the presence of regular late decelerations contradicts the key elements of reassuring FHR patterns and serves as an indicator that further evaluation and intervention may be needed to ensure fetal safety.