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Difficulty: MediumObstetric Complications

An expectant mother at 37 weeks of gestation presents to the triage unit complaining of profound, full-body itching that has progressively worsened over the last week. The sensation is particularly unbearable at night and is concentrated on the palms of her hands and the soles of her feet. She has no prior history of dermatologic conditions, and no visible rash or lesions are observed on physical examination. Her blood pressure is 118/76 mm Hg, and her temperature is 37.1°C (98.8°F).

Laboratory results are as follows:

TestValue
Hemoglobin11.2 g/dL
Platelets185,000/mm³
Total bilirubin0.9 mg/dL
Aspartate aminotransferase (AST)92 U/L
Alanine aminotransferase (ALT)105 U/L
Alkaline phosphatase350 U/L
Total serum bile acids48 µmol/L

A continuous fetal heart rate tracing reveals a baseline of 140/min, moderate variability, and periodic shallow decreases in the heart rate that begin and end exactly symmetrically with the patient's spontaneous mild uterine contractions.

Which of the following is the most appropriate next step in the management of this patient?

  1. Initiate induction of laborAnswer
  2. B
    Discharge home with reassurance of normal third-trimester findings
  3. C
    Proceed to immediate cesarean delivery
  4. D
    Prescribe oral ursodeoxycholic acid and schedule follow-up in one week
  5. E
    Administer intravenous magnesium sulfate and betamethasone

Answer

The most appropriate next step is to initiate induction of labor.
The correct action is to initiate induction of labor. This patient's presentation of generalized pruritus most prominent on the palms and soles, elevated liver transaminases, and elevated total serum bile acids (>10 µmol/L) is diagnostic of intrahepatic cholestasis of pregnancy (ICP). The primary risk associated with ICP is sudden intrauterine fetal demise, a risk that increases substantially as bile acid levels rise (particularly >40 µmol/L) and as pregnancy advances past 36 weeks. Therefore, standard obstetric management dictates delivery at 36-37 weeks of gestation. Because the fetal heart rate tracing is reassuring (displaying benign early decelerations due to head compression), a trial of labor via induction is the most appropriate next step.

Step-by-Step Solution

1
Interpret the clinical presentation and laboratory findings.
The patient presents with severe pruritus on the palms and soles, elevated transaminases, and elevated total serum bile acids (48 µmol/L).
These findings confirm a diagnosis of intrahepatic cholestasis of pregnancy (ICP).
2
Assess the fetal status and risk profile.
The fetus is at 37 weeks of gestation, and the maternal bile acids are severely elevated (>40 µmol/L). The fetal heart tracing shows early decelerations, which are benign.
Bile acid levels above 40 µmol/L significantly increase the risk of sudden intrauterine fetal demise, particularly in the late third trimester.
3
Determine the definitive management.
Delivery is indicated at 36-37 weeks for ICP.
Because the fetal heart rate tracing is reassuring (benign early decelerations) and the patient is at term, induction of labor is the safest and most appropriate intervention.

Key Concept

Intrahepatic cholestasis of pregnancy requires prompt delivery (typically via induction of labor) at 36-37 weeks of gestation to prevent sudden intrauterine fetal demise, especially when serum bile acids exceed 40 µmol/L.
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Topics

Obstetric Complications

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