side by side comparison

Placental Complications: Previa vs Abruption — Pain, Bleeding Pattern, Management

Third-trimester bleeding hits and you need to act fast — but one wrong move kills. Performing a vaginal exam on a previa can trigger fatal hemorrhage. Mistaking abruption's concealed bleeding for a stable patient delays an emergency cesarean. The pain and bleeding pattern tell you which emergency you're facing.

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Comparison

Side-by-side2 compared
Dimension
Placenta Previa
Placental Abruption
Pathophysiology & risk
  • Placenta implants over/near cervical os
  • Prior cesarean, multiparity, AMA, prior previa
  • Premature separation from uterine wall
  • HTN, cocaine, trauma, PROM
Signs & symptoms
  • ★PAINLESS bright-red bleeding
  • Soft, relaxed, nontender uterus
  • ★PAINFUL sudden bleed
  • dark or concealed
  • Board-like rigid uterus
Diagnostics & labs
  • Ultrasound confirms placental location
  • FHR usually reassuring
  • Clinical dx
  • FHR late decels/bradycardia
  • Monitor coags/fibrinogen for DIC
Nursing priorities
  • ★NO vaginal/cervical exam until US confirms
  • Bed rest
  • continuous EFM
  • type & crossmatch
  • Notify provider STAT
  • left lateral
  • IV fluids
  • Continuous EFM
  • prep emergent delivery
Treatment & meds
  • Betamethasone if < 34 wk
  • Rh Ig if Rh−
  • Cesarean if placenta covers os
  • IV fluids/blood products
  • correct DIC
  • Emergent cesarean if moderate–severe
Patient teaching
  • Pelvic rest
  • report any bleeding
  • Report severe pain/bleeding
  • avoid cocaine
  • Control blood pressure
Red flags — escalate
  • Hemorrhage + hypovolemia then emergent cesarean
  • ★DIC, fetal distress/demise, Couvelaire uterus
Complications
  • Hemorrhage
  • preterm birth
  • placenta accreta
  • DIC
  • hemorrhagic shock
  • fetal demise
Pathophysiology & risk

Placenta Previa

  • Placenta implants over/near cervical os
  • Prior cesarean, multiparity, AMA, prior previa

Placental Abruption

  • Premature separation from uterine wall
  • HTN, cocaine, trauma, PROM
Signs & symptoms

Placenta Previa

  • ★PAINLESS bright-red bleeding
  • Soft, relaxed, nontender uterus

Placental Abruption

  • ★PAINFUL sudden bleed
  • dark or concealed
  • Board-like rigid uterus
Diagnostics & labs

Placenta Previa

  • Ultrasound confirms placental location
  • FHR usually reassuring

Placental Abruption

  • Clinical dx
  • FHR late decels/bradycardia
  • Monitor coags/fibrinogen for DIC
Nursing priorities

Placenta Previa

  • ★NO vaginal/cervical exam until US confirms
  • Bed rest
  • continuous EFM
  • type & crossmatch

Placental Abruption

  • Notify provider STAT
  • left lateral
  • IV fluids
  • Continuous EFM
  • prep emergent delivery
Treatment & meds

Placenta Previa

  • Betamethasone if < 34 wk
  • Rh Ig if Rh−
  • Cesarean if placenta covers os

Placental Abruption

  • IV fluids/blood products
  • correct DIC
  • Emergent cesarean if moderate–severe
Patient teaching

Placenta Previa

  • Pelvic rest
  • report any bleeding

Placental Abruption

  • Report severe pain/bleeding
  • avoid cocaine
  • Control blood pressure
Red flags — escalate

Placenta Previa

  • Hemorrhage + hypovolemia then emergent cesarean

Placental Abruption

  • ★DIC, fetal distress/demise, Couvelaire uterus
Complications

Placenta Previa

  • Hemorrhage
  • preterm birth
  • placenta accreta

Placental Abruption

  • DIC
  • hemorrhagic shock
  • fetal demise

★ marks the fact that sets a column apart.

Clinical Pearl

Painless + bright red + soft uterus = previa. Painful + dark red + rigid uterus = abruption.

Component Topics

Placenta PreviaPlacental Abruption

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