USMLE Prep - Medical Reference Library

Postpartum Hemorrhage — Acute Management

System: Obstetrics Gynecology • Reviewed: Aug 31, 2025 • Step 1Step 2Step 3

Synopsis:

Leading cause of maternal morbidity; identify Four Ts (Tone, Trauma, Tissue, Thrombin), activate massive transfusion, give uterotonics and tranexamic acid, and escalate to procedural control.

Key Points

  • Stabilize ABCs; begin targeted evaluation without delaying life-saving therapy.
  • Use system-specific risk tools to guide testing and disposition.
  • Order high-yield tests first; escalate imaging when indicated.
  • Start evidence-based initial therapy and reassess frequently.

Algorithm

  1. Primary survey and vitals; IV access and monitors.
  2. Focused history/physical; identify red flags and likely etiologies.
  3. Order system-appropriate labs and imaging (see Investigations).
  4. Initiate guideline-based empiric therapy (see Pharmacology).
  5. Reassess response; arrange consultation and definitive management.

Clinical Synopsis & Reasoning

For Postpartum Hemorrhage Acute Management, frame the differential by acuity and pathophysiology, then align diagnostics to the leading hypotheses. Prioritize stabilization while obtaining high‑yield studies such as CBC (Baseline hematology), BMP (Electrolytes/renal). Incorporate bedside imaging and targeted labs to define severity and identify complications; synthesize results with clinical trajectory to refine the working diagnosis and disposition needs.


Treatment Strategy & Disposition

Initiate disease‑directed therapy alongside supportive care, titrating to objective response. Pharmacologic options commonly include Analgesia/Antipyretics. Use validated frameworks (e.g., Uterotonics (Examples)) to guide escalation and site of care. Address precipitating factors, de‑escalate empiric therapies with data, and arrange follow‑up for monitoring and risk‑factor modification; admit patients with instability, high risk of deterioration, or needs for close monitoring.


Epidemiology / Risk Factors

  • Risk factors vary by condition and patient profile

Investigations

TestRole / RationaleTypical FindingsNotes
CBCBaseline hematologyAbnormal counts
BMPElectrolytes/renalDerangements

Uterotonics (Examples)

AgentDoseContraindications
Oxytocin10 IU IM or infusion per protocol
Methylergonovine0.2 mg IMHypertension, preeclampsia
Carboprost250 mcg IM q15–90 min (max 2 mg)Asthma
Misoprostol600–800 mcg PO/SL/PRUse per local protocol

Pharmacology

MedicationMechanismOnsetRole in TherapyLimitations
OxytocinUterotonic (oxytocin receptor)MinutesFirst-line uterine atonyWater intoxication (rare); pregnancy/lactation considerations
Tranexamic acidAntifibrinolyticHoursAdjunct within 3 hThrombosis risk; pregnancy/lactation considerations
MethylergonovineErgot alkaloidMinutesSecond-line uterotonic (avoid HTN)Hypertension, vasospasm; pregnancy/lactation considerations
CarboprostPGF2α analogMinutesThird-line uterotonic (avoid asthma)Bronchospasm; pregnancy/lactation considerations

Prognosis / Complications

  • Prognosis depends on severity, comorbidities, and timeliness of care

Patient Education / Counseling

  • Explain red flags and when to seek emergent care.
  • Reinforce medication adherence and follow-up plan.

Notes

Warm the patient and products; maintain ionized calcium with transfusion. Early obstetrics and anesthesia involvement is critical.


References

  1. WHO PPH Recommendations — Link
  2. ACOG Postpartum Hemorrhage — Link