9.3 Maternal Sepsis: Recognition, Resuscitation & Source Control

9.3 Maternal Sepsis: Recognition, Resuscitation & Source Control

Core Focus: Maternal sepsis is a time-sensitive syndrome of infection with organ dysfunction. Fever can be absent, and physiologic leukocytosis or a modestly elevated heart rate can confuse the picture. Act on the whole trajectory rather than waiting for one score or laboratory cutoff.

Sources and risk

Postpartum sources include endometritis or retained infected tissue, cesarean or perineal wound infection, urinary infection/pyelonephritis, pneumonia or aspiration, mastitis/abscess, infected vascular access, and less commonly septic pelvic thrombophlebitis or an occult abdominal/pelvic process. Risks include prolonged rupture of membranes or labor, intraamniotic infection, cesarean birth, hemorrhage/transfusion, invasive procedures, obesity, diabetes, immunocompromise, and delayed access to care.

Recognition

Suspect sepsis when infection accompanies a concerning change in perfusion or organ function:

• altered mental status, marked anxiety/restlessness, or unusual somnolence;
• tachypnea, increased work of breathing, hypoxemia, or rising oxygen need;
• hypotension, narrowing pulse pressure, cool/mottled skin, delayed capillary refill, or persistent tachycardia;
• oliguria, rising creatinine, thrombocytopenia, coagulopathy, or hepatic dysfunction;
• elevated or rising lactate and metabolic acidosis.

Fever, hypothermia, uterine tenderness, foul lochia, dysuria, flank pain, wound drainage, cough, breast findings, or local pain can identify a source. A normal temperature does not exclude sepsis. Maternal early-warning systems support escalation, but thresholds vary and should not be presented as one universal MEOWS definition.

First hour

1. Activate the maternal sepsis/rapid-response pathway and involve obstetrics, anesthesia/critical care, infectious disease, and surgery or interventional radiology as needed.
2. Assess airway, breathing, circulation, mental status, bleeding, and fetal status if still pregnant. Apply oxygen for hypoxemia and continuous monitoring for an unstable patient.
3. Establish IV access. Obtain CBC, metabolic/liver tests, coagulation studies, lactate, and other studies indicated by the source and severity.
4. Obtain blood and source cultures before antibiotics only when this does not delay treatment.
5. Give empiric broad-spectrum IV antibiotics, ideally within one hour when shock or a high likelihood of sepsis is present. Select coverage for the likely source, allergies, local resistance, and recent antibiotics; narrow when cultures and clinical response permit.
6. Pursue source control—such as evacuation of retained infected tissue, drainage of an abscess, wound management, or removal of an infected line—as soon as medically and logistically practical.

Fluids, perfusion, and vasopressors

For hypotension or hypoperfusion, current maternal-sepsis guidance supports 1 to 2 liters of balanced crystalloid during the first three hours, delivered in aliquots with frequent reassessment. Pregnancy/postpartum patients are vulnerable to pulmonary edema. Use dynamic measures when available—response of blood pressure and pulse pressure, capillary refill, mental status, urine output, passive-leg-raise or bedside ultrasound—rather than completing a fixed weight-based volume regardless of response.

Use smaller aliquots and earlier expert/vasopressor assessment in preeclampsia, peripartum cardiomyopathy, renal dysfunction, pulmonary edema, or other fluid-intolerant states. New crackles, worsening hypoxemia, or rising work of breathing should stop reflexive fluid administration and trigger reassessment.

If hypotension persists after appropriate fluid assessment, norepinephrine is the usual first-line vasopressor, often through a well-monitored peripheral line while central access is arranged. A commonly used initial MAP goal is 65 mm Hg, then individualized. Lactate helps assess severity and clearance, but lactate >=4 mmol/L alone does not define septic shock; the clinical definition includes persistent vasopressor-dependent hypotension and metabolic abnormality despite adequate resuscitation.

Reassessment and complications

Trend vital signs, oxygen need, mental status, capillary refill, urine output, lactate, creatinine, platelets/coagulation, and source findings. Watch for acute respiratory distress, disseminated intravascular coagulation, acute kidney injury, myocardial dysfunction, and ongoing hemorrhage. Distinguish distributive shock from hemorrhagic, cardiogenic, and obstructive causes; they can coexist postpartum and require different fluid and medication choices.

Discharge and systems learning

After recovery, reconcile antibiotics, wound or source follow-up, return precautions, and psychological support. Explain that recurrent fever, dyspnea, confusion, fainting, reduced urine, spreading redness, or worsening pain requires urgent reassessment. Debrief severe cases and review delays, communication barriers, respectful-care concerns, and opportunities for prevention.

Antibiotic selection and diagnostic stewardship

Source directs coverage. Endometritis after cesarean birth generally needs broad polymicrobial and anaerobic coverage; pyelonephritis, pneumonia, wound infection, necrotizing soft-tissue infection, and toxic shock require different regimens and procedures. Review allergies carefully, including the reaction type, and adjust doses for renal/hepatic function and body size. Reassess daily for culture-directed narrowing, duration, IV-to-oral transition, and medication compatibility with lactation. “Broad spectrum” is not a substitute for source control or antimicrobial stewardship.

Imaging must follow the suspected source and physiologic stability. Ultrasound can assess retained tissue or a pelvic collection; CT or other imaging may be necessary for deep infection, pulmonary disease, or an alternate diagnosis. Persistent fever despite appropriate therapy prompts reassessment for an undrained abscess, retained products, resistant organism, septic pelvic thrombophlebitis, medication fever, or a noninfectious cause—not automatic indefinite escalation of antibiotics.