In cases of nuchal cord or cord prolapse, which fetal response is expected?

In cases of nuchal cord or cord prolapse, a decreased heart rate variability is typically expected as a response. When the umbilical cord is compressed due to these conditions, it can lead to a decrease in blood flow and oxygen supply to the fetus. This decreased perfusion often results in a less variable heart rate because the fetus is under some form of distress.

Increased heart rate variability generally indicates a well-oxygenated fetus with a healthy autonomic nervous system response, whereas decreased variability suggests that the fetus is experiencing some form of compromise or stress, often linked to hypoxia or acidemia. Therefore, when assessing fetal heart rate patterns in these scenarios, a decreased heart rate variability serves as an important clinical indicator of potential fetal distress that must be addressed promptly.