Obgyn · Year 3 · from Obgyn
Case 2: Non-Reassuring Fetal Heart Rate Tracing and Intrauterine Resuscitation
Patient Demographics
- Age: 31 years
- Sex: Female
- Occupation: Marketing manager
Chief Complaint
"The nurse said the baby's heart rate is dropping."
History of Present Illness
The patient is a G2P1 at 40 weeks 1 day undergoing induction of labor for post-dates. She received misoprostol for cervical ripening followed by oxytocin augmentation. She has been in active labor for 4 hours and just received epidural analgesia. Shortly after the epidural was placed, the fetal heart rate monitor shows recurrent variable decelerations with slow return to baseline.
Current Labor Status
- Cervix: 6 cm dilated, 90% effaced, 0 station
- Oxytocin running at 12 milliunits/minute
- Recent epidural placement with patient supine
- Amniotic fluid clear when membranes ruptured 3 hours ago
Fetal Heart Rate Findings
- Baseline: 150 bpm
- Variability: Minimal (decreased from moderate prior to decelerations)
- Decelerations: Recurrent variable decelerations to 80 bpm, lasting 60-90 seconds, with slow return to baseline
- Accelerations: Absent
Diagnosis
Category II Fetal Heart Rate Tracing with:
- Recurrent variable decelerations (suggesting cord compression)
- Minimal variability (concerning in context of decelerations)
Immediate Intrauterine Resuscitation
Step 1: Position Change
- Patient repositioned from supine to left lateral decubitus
- If no improvement, try right lateral, then hands-and-knees position
Step 2: Discontinue Oxytocin
- Oxytocin infusion stopped immediately to reduce uterine activity
Step 3: IV Fluid Bolus
- 500 mL lactated Ringer's bolus administered to improve maternal perfusion
Step 4: Oxygen
- Supplemental oxygen 10 L/min by face mask (consider if hypoxic)
Step 5: Cervical Examination
- Performed to rule out cord prolapse
- No cord palpable; cervix 6 cm, vertex at 0 station
Step 6: Assess for Tachysystole
- Contraction frequency: 3-4 in 10 minutes (not tachysystole)
Response to Resuscitation
After 5 minutes:
- Variable decelerations persist but less severe (nadir 90 bpm)
- Variability improved to moderate
- Baseline stable at 145 bpm
After 15 minutes:
- Decelerations resolved
- Category I tracing restored
- Oxytocin restarted at lower rate (8 milliunits/minute)
Subsequent Labor Course
- Labor progressed without further significant decelerations
- Complete dilation at 4 hours after resuscitation
- Spontaneous vaginal delivery
- Infant vigorous at birth, Apgar 8/9
Teaching Points
Variable Decelerations:
- Caused by umbilical cord compression
- Characterized by abrupt onset and return
- Mild variables are common and usually benign
- Recurrent severe variables require intervention
When to Consider Emergent Delivery:
- Prolonged deceleration >10 minutes not responding to resuscitation
- Category III tracing (absent variability with recurrent late or variable decelerations, bradycardia, or sinusoidal pattern)
- Evidence of cord prolapse
Documentation:
- Time and nature of abnormality
- Interventions performed and timing
- Response to each intervention
- Communication with team
Clinical Image
Image Description: Electronic fetal heart rate monitoring strip demonstrating variable decelerations with abrupt onset and variable timing relative to contractions. The lower channel shows uterine contraction pattern.
Attribution: Image from medical education resources. Used for educational purposes.