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Difficulty: Very hardAnte/Intra/Postpartum and Newborn Care

Following a high-speed motor vehicle collision, a pregnant client at 34 weeks gestation is admitted to the obstetric triage unit for continuous observation. The client reports no abdominal pain, and palpation reveals a relaxed, non-tender uterus. The client's vital signs are remarkably stable: blood pressure 112/70 mmHg, heart rate 82 bpm, respiratory rate 18/min, and oxygen saturation 99% on room air. Upon reviewing the continuous fetal telemetry data, the nurse observes a baseline heart rate of 155 bpm with completely absent beat-to-beat variability. The tracing displays a continuous, smooth, undulating sine-wave formation oscillating at 4 cycles per minute, which has persisted for the last 25 minutes without any abrupt changes, accelerations, or decelerations. Which of the following is the most accurate clinical interpretation of these findings and the corresponding priority intervention?

  1. A
    Interpretation: The pattern indicates severe umbilical cord compression. Action: Reposition the client into the knee-chest position and facilitate an amnioinfusion.
  2. B
    Interpretation: The pattern represents a normal fetal sleep cycle or benign central nervous system immaturity. Action: Apply a vibroacoustic stimulator to the maternal abdomen to elicit heart rate accelerations.
  3. Interpretation: The pattern signifies profound fetal anemia and severe hypoxia. Action: Notify the obstetric provider immediately and prepare the client for an emergent surgical delivery.Answer
  4. D
    Interpretation: The pattern is a direct consequence of impending maternal hypovolemic shock. Action: Increase the infusion rate of maintenance isotonic crystalloid fluids and elevate the client's lower extremities.

Answer

Interpretation: The pattern signifies profound fetal anemia and severe hypoxia. Action: Notify the obstetric provider immediately and prepare the client for an emergent surgical delivery.
The correct answer accurately identifies the fetal telemetry data as a true sinusoidal pattern. A sinusoidal pattern is an ominous, Category III finding characterized by a smooth, sine wave-like undulating baseline with a frequency of 3 to 5 cycles per minute and absent beat-to-beat variability. It signifies profound fetal anemia (often resulting from fetomaternal hemorrhage in the setting of trauma), severe hypoxia, or acidosis. Because it indicates impending fetal death, the immediate priority is to notify the provider and prepare for an emergent surgical delivery.

Step-by-Step Solution

1
Analyze the maternal assessment findings.
The client has perfectly stable vital signs, a relaxed uterus, and denies any pain following a motor vehicle collision.
To rule out impending maternal hypovolemic shock and typical signs of placental abruption, such as a rigid, board-like abdomen.
2
Interpret the continuous fetal telemetry data.
The tracing shows a baseline of 155 bpm with completely absent variability and a smooth, sine wave-like undulating pattern at 4 cycles per minute, persisting for 25 minutes.
To accurately categorize the fetal heart rate pattern according to standardized clinical guidelines.
3
Synthesize the fetal heart rate interpretation with the clinical context.
The tracing is identified as a true sinusoidal pattern. In the setting of blunt maternal trauma, this pattern strongly suggests a massive fetomaternal hemorrhage causing severe fetal anemia.
To determine the underlying pathophysiology responsible for the abnormal tracing.
4
Determine the priority nursing action for a Category III sinusoidal tracing.
The nurse must notify the provider immediately and prepare the client for an emergent surgical delivery (cesarean birth).
A sinusoidal pattern is an ominous, life-threatening sign that requires immediate delivery to prevent intrauterine fetal demise.

Key Concept

A true sinusoidal fetal heart rate pattern (Category III) is characterized by a smooth, sine wave-like oscillation with absent variability. It signifies severe fetal anemia or hypoxia and requires immediate surgical delivery.
Estimated Time:2m 0s
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Topics

Ante/Intra/Postpartum and Newborn Care

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