During active labor, the CTG shows a gradual decrease in the fetal heart rate that mirrors the uterine contractions, with the nadir occurring at the peak of the contraction. Which of the following is the correct interpretation of this finding?
- A Fetal head compression ✓
- B Umbilical cord compression
- C Uteroplacental insufficiency
- D Fetal hypoxemia
Correct answer: A. Fetal head compression
Explanation
Early decelerations are characterized by a gradual decrease and return of the fetal heart rate that mirrors the contraction, with the nadir at the peak of the contraction. They are caused by vagal stimulation from fetal head compression and are considered physiologic. Variable decelerations indicate cord compression, and late decelerations indicate uteroplacental insufficiency.
Reference: Williams Obstetrics, 26th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.