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Zorluk: KolayLabor, Delivery, and Puerperium

A 28-year-old primigravida at 39 weeks gestation is admitted to the labor and delivery unit in active labor. Her prenatal course was uncomplicated. Currently, her blood pressure is 118/76 mm Hg, heart rate is 82/min, and temperature is 37.1°C (98.8°F). Vaginal examination reveals that the cervix is dilated to 6 cm, 90% effaced, with the fetal head at +1 station. External fetal monitoring shows a baseline fetal heart rate of 140/min with moderate variability. During uterine contractions, there are recurrent, symmetric decreases in the fetal heart rate to 130/min. The onset, nadir, and recovery of each fetal heart rate decrease precisely align with the beginning, peak, and end of the respective uterine contraction. Which of the following is the most appropriate next step in management?

  1. A
    Administer intravenous terbutaline
  2. B
    Initiate maternal left lateral positioning and administer oxygen
  3. Continue routine labor monitoringCevap
  4. D
    Perform a prophylactic amnioinfusion
  5. E
    Prepare for urgent cesarean delivery

Cevap

Continue routine labor monitoring
The patient's fetal heart rate tracing describes classic early decelerations. These are defined by a gradual, symmetric decrease in the fetal heart rate that aligns perfectly with uterine contractions (the onset, nadir, and recovery of the deceleration match the beginning, peak, and end of the contraction). Early decelerations are caused by fetal head compression during contractions, which alters cerebral blood flow and stimulates a vagal response. Because this is a benign, physiologic finding in active labor that does not indicate fetal hypoxia or acidemia, the most appropriate management is to continue routine monitoring without intervention.

Adım Adım Çözüm

1
Analyze the fetal heart rate (FHR) tracing described in the vignette.
The tracing shows a normal baseline (140/min), moderate variability, and symmetric decelerations that perfectly mirror the uterine contractions (onset to onset, nadir to peak).
Accurate interpretation of FHR patterns is required to differentiate between physiologic and pathologic fetal states.
2
Diagnose the specific type of fetal heart rate deceleration.
The pattern describes classic 'early decelerations', which occur due to fetal head compression altering cerebral blood flow and triggering a vagal response.
Identifying the etiology of the deceleration guides subsequent management.
3
Determine the appropriate clinical intervention for early decelerations.
Because early decelerations are a benign, physiologic finding that do not indicate fetal hypoxia or acidemia, no intervention is necessary.
Intervening on normal physiologic processes of labor introduces unnecessary risk.

Anahtar Kavram

Early decelerations in fetal heart rate monitoring are characterized by a symmetric decrease that mirrors the uterine contraction. They are caused by benign fetal head compression and require only routine continued observation.
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Labor, Delivery, and Puerperium

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