Placenta Accreta Spectrum
Key Points
- Placenta accreta spectrum is abnormal placental invasion beyond the endometrium into the uterine wall, sometimes extending to nearby organs.
- Risk rises with prior cesarean birth, prior placenta accreta, and prior uterine surgery.
- Diagnosis is commonly made with ultrasound or MRI, but some cases are first recognized at placental-delivery stage.
- Major danger is catastrophic obstetric hemorrhage.
- Management usually requires planned cesarean delivery with multidisciplinary hemorrhage-readiness and frequent hysterectomy planning.
Pathophysiology
In placenta accreta spectrum, decidual separation layers are deficient and placental tissue invades too deeply into uterine tissue. Abnormal placental adherence prevents normal placental separation after birth and can trigger massive bleeding during attempts at placental removal.
Severity varies from limited myometrial invasion to extensive invasion involving adjacent structures. This invasion pattern drives operative complexity and hemorrhage risk.
Classification
- Accreta-pattern invasion: Placenta abnormally adheres to the uterine wall.
- Increta-pattern invasion: Placenta invades deeper into myometrium.
- Percreta-pattern invasion: Placenta penetrates through uterine wall and may involve nearby organs.
Nursing Assessment
NCLEX Focus
In known or suspected placenta accreta spectrum, focus on hemorrhage readiness and multidisciplinary coordination before labor onset.
- Assess high-risk history: prior cesarean, prior uterine surgery, and prior accreta diagnosis.
- Review prenatal imaging findings and planned delivery pathway details.
- Assess maternal hemodynamics and bleeding signs throughout antepartum surveillance and delivery admission.
- Assess laboratory readiness and blood-product availability in anticipated high-blood-loss cases.
- Assess emotional distress and informed-consent understanding related to possible hysterectomy and critical-care recovery.
Nursing Interventions
- Coordinate planned high-risk cesarean pathway with obstetric, anesthesia, blood-bank, and surgical subspecialty teams.
- Ensure multiple large-bore IV access and hemorrhage-protocol readiness before operative start.
- Prepare for massive transfusion support and continuous hemodynamic monitoring.
- Reinforce counseling that hysterectomy is frequently required to control life-threatening bleeding.
- Support ICU-level postoperative monitoring when indicated for severe blood loss or multiorgan risk.
- Provide clear preoperative and postoperative education with psychosocial support.
Catastrophic Hemorrhage Potential
Attempted placental separation in invasive placentation can trigger rapid, life-threatening blood loss.
Pharmacology
| Drug Class | Examples | Key Nursing Considerations |
|---|---|---|
| blood-products | PRBC, plasma, platelets, cryoprecipitate contexts | Prepare early because operative blood-loss volumes can be high and abrupt. |
| uterotonics | oxytocin and adjunct uterotonic contexts | Used postdelivery as ordered, but bleeding control in invasive placentation often requires surgical management. |
Clinical Judgment Application
Clinical Scenario
A patient with two prior cesarean births has prenatal ultrasound findings concerning for invasive placentation and is admitted for planned delivery.
- Recognize Cues: Major accreta-spectrum risk history with imaging confirmation.
- Analyze Cues: Hemorrhage and operative-complexity risk are high.
- Prioritize Hypotheses: Priority is planned multidisciplinary delivery with maximal hemorrhage readiness.
- Generate Solutions: Coordinate blood products, surgical-team roles, anesthesia plan, and postoperative level-of-care planning.
- Take Action: Implement high-risk cesarean protocol and continuous maternal stabilization measures.
- Evaluate Outcomes: Delivery and hemorrhage management proceed with timely escalation and controlled hemodynamic outcomes.
Related Concepts
- conditions-limited-to-pregnancy - Placenta accreta spectrum is a major pregnancy-specific hemorrhage condition.
- placenta-previa - Previa and prior cesarean history often coexist with accreta risk.
- complications-in-the-third-stage-of-labor - Invasive placentation can prevent normal placental separation.
- postpartum-hemorrhage - Severe hemorrhage preparedness is central to accreta care.
Self-Check
- Which history findings most strongly increase placenta accreta spectrum risk?
- Why is planned multidisciplinary delivery preferred over unplanned intrapartum management?
- Why is hysterectomy commonly discussed before delivery in severe accreta pathways?