Match each clinical presentation of a pregnant patient in the third trimester with the pathophysiologic description of the most likely underlying obstetric complication.
- A 31-year-old G3P2 at 32 weeks gestation presents with acute onset of severe, continuous abdominal pain, dark vaginal bleeding, and a rigid, tender uterus. Blood pressure is 160/105 mmHg.Premature separation of the placenta from the uterine decidua
- A 29-year-old G2P1 at 38 weeks gestation with a history of a prior classical cesarean delivery presents with sudden, tearing lower abdominal pain, cessation of previously regular uterine contractions, and new-onset maternal tachycardia.Full-thickness disruption of the uterine muscle and overlying serosa
- A 34-year-old G4P3 at 34 weeks gestation with a history of two prior cesarean deliveries presents with an episode of painless, bright red vaginal bleeding that began shortly after sexual intercourse. The uterus is soft and non-tender.Abnormal implantation of placental tissue over the internal cervical os
- A 27-year-old G1P0 at 35 weeks gestation experiences a sudden gush of clear fluid followed immediately by frank vaginal bleeding. The electronic fetal monitor rapidly transitions from a reactive tracing to a persistent sinusoidal pattern.Fetal blood vessels traversing the lower segment membranes unsupported by placenta or umbilical cord
Answer
The clinical vignettes correctly match with their respective pathophysiologies: painful bleeding with a rigid uterus to premature separation of the placenta (placental abruption); prior classical cesarean with tearing pain and cessation of contractions to full-thickness disruption of the uterine muscle (uterine rupture); painless bleeding post-coitus to abnormal implantation over the internal cervical os (placenta previa); and bleeding immediately after rupture of membranes with a sinusoidal fetal heart rate to unsupported fetal blood vessels traversing the membranes (vasa previa).
Each obstetric emergency in the third trimester has hallmark clinical signs directly tied to its pathophysiology. Placental abruption (premature separation) presents with pain, a rigid uterus, and is often linked to hypertension. Uterine rupture (full-thickness disruption) is characterized by a sudden tearing sensation, loss of contractions, and a history of uterine surgery. Placenta previa (abnormal implantation over the os) presents with painless, bright red bleeding provoked by cervical trauma. Vasa previa (unsupported fetal vessels) specifically presents with fetal hemorrhage (sinusoidal pattern) immediately upon rupture of membranes.
Step-by-Step Solution
Key Concept
Differentiating etiologies of third-trimester obstetric emergencies based on distinguishing clinical features and underlying pathophysiology.
Estimated Time:1m 30s