Labor Progress and Fetal Heart Rate Deceleration
Ms. Okafor, G2P1, is at 41 weeks gestation and has been in active labor for 9 hours. She is 6 cm dilated, 90% effaced, station 0. She received an epidural 2 hours ago. Over the past 30 minutes the fetal heart rate tracing shows repetitive decelerations that begin shortly after each contraction peaks and return to baseline by the end of the contraction. The baseline FHR is 140/min with moderate variability. The last vaginal exam was 2 hours ago. She reports a gush of fluid 20 minutes ago and the pad is now wet with clear fluid. Contractions are every 2-3 minutes, lasting 60 seconds.
1. Classify the decelerations and explain the physiologic mechanism.
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These are early decelerations: they begin with the contraction, mirror it, and return to baseline by the end of the contraction. They are caused by head compression stimulating a vagal response and are generally benign.
Reasoning: Timing relative to the contraction is the key discriminator. Early = head compression (benign); variable = cord compression; late = uteroplacental insufficiency (concerning). The moderate variability and normal baseline support a reassuring picture.
2. Given the spontaneous rupture of membranes, what reassessment is now the priority?
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Immediate priority: assess for cord prolapse and check fetal status. After rupture of membranes, especially with a presenting part at station 0, the cord can prolapse. The nurse should inspect the perineum for visible cord, check the FHR immediately, and perform a vaginal exam to assess station and rule out prolapse.
If cord prolapse is found: call for help, position the patient knee-chest or Trendelenburg, elevate the presenting part with a gloved hand, and prepare for emergency cesarean delivery.
Reasoning: Cord prolapse is a time-critical emergency; the first minutes determine fetal outcome. Clear fluid is reassuring for meconium but does not rule out prolapse.
3. The decelerations become late and variability drops to minimal. What is the priority nursing action?
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Late decelerations with minimal variability indicate uteroplacental insufficiency and fetal compromise. Priority actions:
- Reposition to left lateral (or knee-chest) to relieve cord/aortocaval compression.
- Increase IV fluids if ordered.
- Stop oxytocin if running.
- Administer oxygen per protocol.
- Notify the provider immediately and prepare for possible expedited delivery.
Reasoning: The change from early to late with reduced variability is a deterioration signal. The nurse acts on the pattern, not on a single reading, and escalates without delay.