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Difficulty: MediumObstetric Complications

A 3131-year-old pregnant patient (G2P1) presents to the obstetric triage unit at 3131 weeks gestation after experiencing a sudden gush of clear vaginal fluid. The fluid loss occurred approximately 22 hours ago, and she reports continuous vaginal leaking since that time. The patient notes normal fetal movement and denies painful uterine contractions or vaginal bleeding. Her previous pregnancy resulted in an uncomplicated term vaginal delivery. She takes a daily prenatal vitamin and has no known drug allergies.

Her temperature is 37.1∘37.1^{\circ} C (98.8∘98.8^{\circ} F), blood pressure is 112/72112/72 mm Hg, pulse is 8484/min, and respiratory rate is 1616/min. Speculum examination reveals a visually closed cervical os with a pool of clear fluid in the posterior vaginal fornix. The fluid turns nitrazine paper blue and demonstrates an arborization pattern on microscopic evaluation.

Continuous external fetal monitoring shows a baseline heart rate of 145145/min with moderate variability, presence of spontaneous accelerations, and no decelerations. Tocodynamometry confirms the absence of uterine contractions. Laboratory evaluation reveals:

Hemoglobin: 10.810.8 g/dL
Leukocyte count: 14,20014,200/mm 3^3
Platelet count: 185,000185,000/mm 3^3

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

  1. Administration of intramuscular betamethasone and intravenous ampicillin and azithromycinAnswer
  2. B
    Induction of labor with intravenous oxytocin
  3. C
    Preparation for emergent operative delivery
  4. D
    Administration of intravenous piperacillin-tazobactam
  5. E
    Administration of supplemental oxygen and maternal repositioning to the left lateral decubitus position

Answer

The most appropriate next step is the administration of intramuscular betamethasone and intravenous ampicillin and azithromycin.
The correct management for a patient with preterm premature rupture of membranes (PPROM) at less than 34 weeks gestation who has reassuring fetal and maternal status is expectant management. This includes the administration of corticosteroids (such as betamethasone) to promote fetal lung maturity and latency antibiotics (such as ampicillin and azithromycin) to prolong the latency period before the onset of labor and provide prophylaxis against Group B Streptococcus (GBS) and other ascending pathogens.

Step-by-Step Solution

1
Diagnose the patient's presentation based on physical examination and fluid testing.
The history of a sudden fluid gush combined with pooling on speculum exam, a positive nitrazine test (blue), and a positive ferning test (arborization) confirms the diagnosis of preterm premature rupture of membranes (PPROM).
Accurate diagnosis is required to establish the specific obstetric complication before initiating pathway-driven management.
2
Evaluate maternal and fetal status for indications of immediate delivery.
Maternal vital signs are normal (no fever), and the fetal heart rate tracing is Category I (baseline 145/min, moderate variability, accelerations). The leukocytosis is a normal physiologic change of pregnancy.
The presence of intraamniotic infection or non-reassuring fetal status would mandate immediate delivery regardless of gestational age.
3
Determine the appropriate management based on the gestational age of 31 weeks.
Because the patient is at less than 34 weeks gestation with no maternal or fetal compromise, expectant management to prolong the pregnancy is indicated.
Preterm delivery carries significant risks of neonatal respiratory distress syndrome and intraventricular hemorrhage, which are mitigated by prolonging the latency period.
4
Select the correct prophylactic medications for expectant management.
The patient should receive a course of corticosteroids (betamethasone) for fetal lung maturation and prophylactic latency antibiotics (ampicillin and a macrolide like azithromycin).
Latency antibiotics reduce the risk of ascending infection and prolong the time from membrane rupture to delivery, optimizing the efficacy of the administered corticosteroids.

Key Concept

Management of uncomplicated preterm premature rupture of membranes (PPROM) at < 34 weeks gestation requires expectant management with latency antibiotics (e.g., ampicillin and azithromycin) and corticosteroids to accelerate fetal lung maturity.
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Topics

Obstetric Complications

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