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Difficulty: HardObstetric Complications

Match each clinical vignette describing an obstetric emergency to the most likely underlying diagnosis. Evaluate the specific risk factors and clinical findings to determine the correct etiology.

  • A 32-year-old at 35 weeks gestation with a history of a transmural myomectomy presents with sudden-onset, sharp abdominal pain. Vaginal exam reveals the presenting fetal part is no longer palpable, and profound fetal bradycardia is noted.Uterine rupture
  • A 28-year-old at 37 weeks gestation with severe polyhydramnios experiences a massive gush of clear fluid following spontaneous rupture of membranes. This is immediately followed by unremitting abdominal pain, a rigid uterus, and nonreassuring fetal status.Placental abruption
  • A 30-year-old at 36 weeks gestation with a known succenturiate placental lobe undergoes artificial rupture of membranes. Minutes later, she develops modest vaginal bleeding and the fetal heart tracing reveals a persistent sinusoidal pattern.Vasa previa
  • A 34-year-old at 32 weeks gestation with a history of multiple prior cesarean deliveries presents with new-onset, painless, bright red vaginal bleeding following sexual intercourse. Fetal heart tracing is reactive and reassuring.Placenta previa

Answer

The correct matches are: 1) The transmural myomectomy vignette matches Uterine rupture; 2) The polyhydramnios rapid decompression vignette matches Placental abruption; 3) The succenturiate lobe and amniotomy vignette matches Vasa previa; 4) The painless bleeding post-intercourse vignette matches Placenta previa.
Differentiating obstetric emergencies requires synthesizing maternal history, inciting events, and fetal monitoring. Uterine rupture occurs in scarred uteri and is marked by loss of fetal station. Placental abruption involves a painful, rigid uterus and can be triggered by sudden uterine decompression. Vasa previa presents with fetal bleeding, identifiable by a sinusoidal heart rate following membrane rupture in high-risk placental anatomies. Placenta previa classically presents as painless, bright red maternal bleeding without immediate fetal distress.

Step-by-Step Solution

1
Analyze the vignette involving the patient with a transmural myomectomy.
The patient presents with sudden severe pain, loss of fetal station, and fetal bradycardia.
These findings are pathognomonic for uterine rupture, a major risk in patients with prior transmural uterine surgery.
2
Evaluate the vignette detailing polyhydramnios and a sudden massive fluid gush.
The rapid loss of amniotic fluid is immediately followed by a rigid, painful uterus and fetal distress.
Sudden decompression of the overdistended uterus causes shearing forces between the placenta and uterine wall, resulting in placental abruption.
3
Assess the vignette describing a succenturiate lobe, amniotomy, and bleeding.
The fetus develops a sinusoidal heart rate pattern following amniotomy.
A sinusoidal pattern indicates severe fetal anemia, confirming that the bleeding originates from torn fetal vessels (vasa previa) associated with the succenturiate lobe.
4
Review the vignette with a patient experiencing painless bleeding after intercourse.
The patient has bright red bleeding without pain and a reassuring fetal heart tracing.
This is the classic presentation of placenta previa, where the placenta covers the cervical os and bleeds easily upon minor contact, typically without causing immediate fetal distress.

Key Concept

Clinical differentiation of third-trimester obstetric emergencies
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Topics

Obstetric Complications

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