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Question

Difficulty: MediumObstetric Complications

Pair the following maternal and fetal clinical presentations with the correct obstetric complication.

  • A 28-year-old G3P2 at 39 weeks gestation with a prior classical cesarean delivery suddenly experiences severe abdominal pain, loss of fetal station, and abrupt cessation of uterine contractions.Uterine rupture
  • A 35-year-old G2P1 at 36 weeks gestation with chronic hypertension presents with acute-onset intense abdominal pain, dark red vaginal bleeding, and a continuously firm, tender uterus.Abruptio placentae
  • A 30-year-old G4P3 at 35 weeks gestation presents with a sudden episode of painless, bright red vaginal bleeding that began while resting, accompanied by reassuring fetal heart tones.Placenta previa
  • A 26-year-old G1P0 at 38 weeks gestation with a known velamentous cord insertion experiences sudden vaginal bleeding and profound fetal bradycardia immediately after spontaneous membrane rupture.Vasa previa

Answer

The presentation with a prior classical cesarean, loss of fetal station, and cessation of contractions corresponds to Uterine rupture. The presentation with chronic hypertension, intense abdominal pain, and a firm uterus corresponds to Abruptio placentae. The presentation with painless, bright red vaginal bleeding while resting corresponds to Placenta previa. The presentation with velamentous cord insertion and profound fetal bradycardia after membrane rupture corresponds to Vasa previa.
Each clinical vignette contains hallmark features of a specific obstetric emergency. Uterine rupture is characterized by a loss of fetal station and cessation of contractions, especially in patients with prior uterine surgery. Abruptio placentae presents with painful, dark vaginal bleeding and a rigid uterus, strongly associated with maternal hypertension. Placenta previa is the classic cause of painless, bright red third-trimester bleeding. Vasa previa uniquely presents with painless bleeding and immediate fetal distress (bradycardia) occurring precisely at the time of amniotomy or spontaneous membrane rupture.

Step-by-Step Solution

1
Analyze the first clinical vignette to identify key pathognomonic signs.
Identified classic signs of uterine rupture: prior classical cesarean, sudden severe pain, loss of fetal station, and cessation of contractions.
These signs point directly to full-thickness disruption of the myometrium with extrusion of fetal parts.
2
Evaluate the second presentation focusing on maternal risk factors and uterine physical exam findings.
Identified abruptio placentae based on chronic hypertension, sudden severe pain, dark bleeding, and a hypertonic, tender uterus.
Hypertension is a major risk factor for premature placental separation, leading to concealed or revealed hemorrhage with tetanic uterine contractions.
3
Assess the third scenario's bleeding characteristics and fetal status.
Diagnosed placenta previa due to the sudden onset of painless, bright red vaginal bleeding in the third trimester with reassuring fetal status.
Placental tissue overlying the cervical os can bleed painlessly as the lower uterine segment changes, without causing immediate uterine hypertonus.
4
Correlate the fourth patient's membrane rupture event with the immediate fetal heart rate changes.
Recognized vasa previa rupture based on the velamentous cord insertion, immediate bleeding upon membrane rupture, and profound fetal bradycardia.
Rupture of fetal vessels causes rapid fetal exsanguination, immediately reflected as severe fetal bradycardia.

Key Concept

Differentiating third-trimester bleeding and obstetric emergencies relies on evaluating pain, uterine tone, maternal risk factors, and fetal heart rate patterns.
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Topics

Obstetric Complications

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