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Maternal Sepsis

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Maternal Sepsis

Key Points

  • Maternal sepsis is a life-threatening organ dysfunction resulting from infection during pregnancy, delivery, post-abortion, or within 42 days of delivery — it is a leading cause of preventable maternal mortality.
  • Common obstetric sources: chorioamnionitis, postpartum endometritis, urinary tract infection (pyelonephritis), wound infection, and mastitis.
  • Sepsis screening uses modified criteria adapted to pregnancy physiology: positive screen = 2 or more of 4 criteria met (temperature, HR, RR, WBC).
  • In immediate postpartum infection screening, SIRS thresholds (temperature over 38 C or under 36 C, HR over 90, RR over 20 or PaCO2 under 32, and abnormal WBC/bands) should trigger urgent reassessment and escalation.
  • Early recognition and rapid antibiotic treatment are critical — delay significantly increases maternal morbidity and mortality.
  • Altered mental status and hypotension indicate septic shock and require emergency escalation.

Pathophysiology

Bacterial entry through disrupted obstetric tissues (uterine lining, perineum, cesarean incision, urinary tract) or ascending vaginal flora triggers systemic inflammation. Cytokine release causes widespread vasodilation and capillary leak, reducing effective circulating volume and impairing oxygen delivery to organs. Untreated, progression to multiorgan dysfunction (renal, hepatic, respiratory, coagulation) and septic shock can occur rapidly.

Common Obstetric Sources

SourceRisk Factors
chorioamnionitis (infection of fetal membranes)Prolonged rupture of membranes, frequent cervical exams, internal fetal monitoring, meconium-stained fluid, group B Streptococcus colonization
Postpartum endometritis (uterine infection)Cesarean birth, operative delivery, prolonged labor, chorioamnionitis
Urinary tract infection / pyelonephritisUrinary catheterization, anatomic changes of pregnancy
Wound infectionEpisiotomy, laceration, cesarean incision, obesity (BMI ≥30)
MastitisBreast engorgement, cracked nipples, delayed treatment

Additional intrapartum cues of chorioamnionitis progression include maternal or fetal tachycardia, uterine tenderness, foul-smelling amniotic fluid, and purulent cervical discharge.

Nursing Assessment

NCLEX Focus

Modified early warning signs are essential because normal pregnancy physiology includes elevated baseline HR, lower BP, and elevated WBC — using standard adult thresholds will miss early maternal sepsis. Use validated obstetric-specific screening tools.

CMQCC Maternal Sepsis Screen — Positive if 2 or more of 4 criteria are met:

  • Temperature <36°C (96.8°F) or ≥38°C (100.4°F)
  • Heart rate >110 beats/minute
  • Respiratory rate >24 breaths/minute
  • WBC >15,000/mm³ or <4,000/mm³ or >10% bands

Additional cues requiring urgent assessment:

  • New onset altered mental status (confusion, agitation, lethargy)
  • Warm clammy skin, intense fatigue, and severe diffuse pain
  • Hypotension (systolic <90 mmHg or MAP <65 mmHg) — suggests septic shock
  • Decreased urine output (<30 mL/hour)
  • Skin changes: mottling, flushing, cool extremities
  • Uterine tenderness or foul-smelling lochia (endometritis)
  • Wound erythema, purulent drainage, dehiscence

Diagnostic testing:

  • Blood cultures × 2 sets (before antibiotics if possible)
  • CBC (leukocytosis or leukopenia), lactate (elevated = impaired perfusion), CMP (organ dysfunction markers), coagulation studies
  • Urinalysis and urine culture, wound culture if applicable
  • Imaging as indicated for source identification (CT, ultrasound)

Nursing Interventions

Sepsis bundle (initiate within 1–3 hours of recognition):

  1. Draw blood cultures before antibiotic administration when possible
  2. Administer broad-spectrum IV antibiotics immediately — do not delay pending culture results (ampicillin + gentamicin is common first-line combination)
  3. IV fluid resuscitation — 30 mL/kg crystalloid bolus for hypotension or elevated lactate ≥4 mmol/L
  4. Measure and report lactate level
  5. Reassess hourly for response or deterioration

Ongoing monitoring:

  • Continuous maternal vital signs and fetal heart rate monitoring (antepartum)
  • Hourly urine output via indwelling catheter — target ≥30 mL/hour
  • Serial lactate to monitor tissue perfusion
  • Notify multidisciplinary team (obstetrics, maternal-fetal medicine, infectious disease, ICU if needed)
  • In severe shock physiology, anticipate vasopressor/inotropic support and organ-support escalation (for example oxygen-intensification, renal support pathways) per ICU protocol.

Delivery considerations: If sepsis is antepartum, delivery may be the definitive treatment — coordinate with obstetric team regarding timing and mode.

Septic Shock Emergency

New onset hypotension + altered mental status in a postpartum or pregnant client = septic shock until proven otherwise. Activate rapid response team immediately, obtain IV access, collect cultures and lactate, administer antibiotics and fluids, and prepare for possible ICU transfer.

Self-Check

  1. A postpartum client on day 2 after cesarean delivery has a temperature of 38.4°C, HR 118, RR 26, and WBC 16,200. How many CMQCC criteria are positive, and what is the priority nursing action?
  2. Why is early administration of antibiotics (within 1 hour of sepsis recognition) critical in maternal sepsis management?
  3. Which postpartum clinical finding most clearly distinguishes endometritis from urinary tract infection as a source of infection?

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