Management of Intraamniotic Infection (Chorioamnionitis)

Diagnosis and Clinical Decision‑Making

• Do not wait for maternal fever to diagnose intraamniotic infection; the condition can present without fever, especially at earlier gestational ages, and treatment should be started as soon as any other sign of infection (e.g., maternal tachycardia, purulent cervical discharge, uterine tenderness) is present. – American College of Obstetricians and Gynecologists (ACOG) 1
• Amniocentesis results must not delay initiation of therapy; clinical management should proceed based on bedside assessment. – ACOG 1
• Maternal sepsis can progress rapidly: the median interval from first infection signs to death is only 18 hours, underscoring the need for immediate treatment. – ACOG 2

Maternal Treatment

• Broad‑spectrum intravenous antibiotics (ampicillin plus gentamicin) should be administered promptly after clinical diagnosis; the regimen covers the polymicrobial nature of intraamniotic infection. – ACOG 1

Delivery Considerations

• Delivery should be undertaken without delay once antibiotics are started; chorioamnionitis cannot be cured by antibiotics alone. – ACOG 1
• The route of delivery is dictated by standard obstetric indications—not by the infection itself; cesarean delivery offers no fetal advantage and may increase maternal morbidity. – ACOG 1

Neonatal Management (Newborns of Mothers with Chorioamnionitis)

• Well‑appearing newborns: obtain a limited evaluation (blood culture and CBC with differential) and begin empirical antibiotics (IV ampicillin for GBS coverage plus an agent active against E. coli). – American Academy of Pediatrics (AAP) 3
• Newborns with any sign of sepsis: perform a full diagnostic work‑up (blood culture, CBC with differential, chest radiograph if respiratory symptoms, lumbar puncture if the infant is stable) and start empirical broad‑spectrum antibiotics immediately. – AAP 3
• CBC sensitivity improves when the sample is taken 6–12 hours after birth, but antibiotic therapy must not be delayed awaiting the result. – AAP 3
• Empirical antibiotics should be discontinued once the clinical course and laboratory data exclude sepsis. – AAP 3

Prognostic Data in Preterm Pre‑Labor Rupture of Membranes (PPROM)

In women with PPROM managed expectantly, intraamniotic infection occurs in more than half of cases, reinforcing the need for high clinical suspicion.* – ACOG 2

All facts are drawn from peer‑reviewed sources and reflect current ACOG and AAP recommendations.

Chorioamnionitis Diagnosis and Management

Diagnosis and Treatment

• The Centers for Disease Control and Prevention recommends that chorioamnionitis be diagnosed clinically based on maternal fever (≥100.4°F/38.0°C) plus at least one of the following: maternal tachycardia, fetal tachycardia, uterine tenderness, foul-smelling amniotic fluid, or maternal leukocytosis 4
• The American College of Obstetricians and Gynecologists recommends intrapartum antibiotics, including ampicillin (2g IV initial dose, then 1g IV every 4 hours until delivery) and gentamicin (loading dose followed by maintenance dosing based on weight), for the treatment of chorioamnionitis 5, 6

Antibiotic Regimens

• For patients with non-severe penicillin allergies, the Centers for Disease Control and Prevention recommends cefazolin (2g IV initial dose, then 1g IV every 8 hours until delivery) as an alternative to ampicillin 6
• For patients with severe penicillin allergies, the Centers for Disease Control and Prevention recommends clindamycin (900 mg IV every 8 hours until delivery) or vancomycin (1g IV every 12 hours until delivery) as alternatives to ampicillin 6

Neonatal Management

• The American Academy of Pediatrics recommends that all newborns with signs of sepsis receive a full diagnostic evaluation, including blood culture, CBC with differential, chest radiograph if respiratory symptoms, and lumbar puncture if stable, and empirical antibiotic therapy including agents active against GBS (IV ampicillin) and E. coli 5
• The American Academy of Pediatrics recommends that well-appearing newborns whose mothers had chorioamnionitis receive a limited evaluation, including blood culture and CBC with differential, and empirical antibiotic therapy pending culture results 5, 7

Management of Maternal Fever During Labor

Antibiotic Management

• The American College of Obstetricians and Gynecologists recommends initiating antibiotics within 3 hours of fever recognition, or within 1 hour if septic shock is suspected, with blood cultures obtained before antibiotic administration when feasible 8

Adjunctive Measures

• The goal is to maintain normothermia, as hyperthermia adversely impacts uterine contractility and may lower the threshold for fetal hypoxic brain injury 9

Common Pitfalls

• The American Journal of Obstetrics and Gynecology advises against withholding antibiotics pending amniocentesis results or waiting for maternal fever to develop in suspected chorioamnionitis 10