What is considered an abnormal finding in a contraction stress test?

• A. No decelerations during contractions
• B. Presence of late decelerations
• C. Normal fetal heart rate
• D. Fetal heart rate variability

Answer: (B)

The presence of late decelerations during a contraction stress test is an abnormal finding. Late decelerations are defined as a gradual decrease in fetal heart rate that begins at the peak of a contraction and returns to baseline after the contraction has ended. This pattern is concerning as it indicates that the fetus may not be receiving enough oxygen during contractions, suggesting potential placental insufficiency or other issues.

In contrast, a normal finding would be characterized by the absence of decelerations during contractions, a normal fetal heart rate, and appropriate fetal heart rate variability. These normal parameters indicate a well-oxygenated fetus that is responding appropriately to the stresses imposed by contractions. Thus, the presence of late decelerations is indicative of a compromise in fetal well-being and warrants further evaluation and potential intervention.