ChorioamnionitisMANAGEMENT

OBSTETRIC PRESENTATIONS · 12 SECTIONS

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499 items

☷ Legend

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Cardiovascular Presentations71▾

Respiratory Presentations52▾

Neurological Presentations83▾

Gastrointestinal Presentations74▾

Genitourinary and Reproductive Presentations48▾

Infectious Disease Presentations148▾

Trauma Presentations89▾

Toxicologic Presentations80▾

Psychiatric Presentations26▾

Musculoskeletal and Rheumatologic Presentations96▾

Dermatology Presentations23▾

Environmental and Exposure Presentations27▾

Hematologic and Oncologic Presentations36▾

Pediatric-Specific Presentations19▾

Endocrine and Metabolic Presentations45▾

ENT and Maxillofacial Presentations27▾

Ophthalmologic Presentations19▾

Obstetric Presentations23▾

Chorioamnionitis Eclampsia Ectopic Pregnancy (Ruptured)Ectopic Pregnancy (Unruptured)HELLP Syndrome Hyperemesis gravidarum Peripartum cardiomyopathy Placenta previa Placental abruption Postpartum Endometritis Postpartum hemorrhage Postpartum infection Preeclampsia Preeclampsia-eclampsia Preterm labor Sepsis in pregnancy Septic abortion Shoulder dystocia Spontaneous Abortion (Incomplete)Spontaneous Abortion (Missed)Spontaneous Abortion (Threatened)Threatened-inevitable-incomplete abortion Umbilical cord prolapse

Systemic and Miscellaneous Presentations17▾

01Approach to the Critical Patient/attcp48

Immediate recognition and triage

›Triple I recognition framework

›Maternal fever as primary trigger

›Single temperature >= 39.0 C (102.2 F) treated as fever requiring immediate evaluation

›Temperature 38.0 to 38.9 C (100.4 to 102.0 F) confirmed by repeat measurement within 30 minutes

›Additional Triple I criteria alongside fever

›Baseline fetal heart rate > 160 beats/min for >= 10 minutes

›Maternal leukocytosis without recent antenatal corticosteroid exposure

›Purulent fluid visualized at the cervical os

›Isolated maternal fever handled differently from suspected or confirmed Triple I

›Isolated fever is fever alone without additional criteria — most such patients do not have true infection

›Suspected or confirmed Triple I is fever plus at least one additional criterion — antibiotics indicated

Maternal-fetal stabilization bundle

›Dual-patient stabilization

›Maternal vital sign stabilization

›If maternal hypotension or tachycardia out of proportion to labor, sepsis pathway activation

›If maternal hypoxia, supplemental oxygen to maintain SpO2 >= 95%

›Continuous fetal heart rate monitoring

›Fetal tachycardia is often the earliest sign, preceding documented maternal fever

›Category II or III tracing prompts immediate obstetric notification

›Antibiotic initiation without delay

›IV antibiotics within 1 hour of suspected or confirmed Triple I

›Do not withhold antibiotics pending definitive amniotic fluid confirmation

›Delivery planning in parallel with antibiotics

›Antibiotics alone do not resolve intraamniotic infection

›Delivery is the definitive treatment once maternal and fetal status allow

Key decisions

›Route of delivery

02History/hx52

Presenting symptoms and fever pattern

›Fever characterization

›Onset during labor

›Distinguishes from the later postpartum endometritis fever pattern

›Threshold documentation

›Single reading >= 39.0 C

›Repeat-confirmed 38.0 to 38.9 C

›Associated chills or rigors

›Suggests bacteremia

›Uterine symptoms

›Uterine tenderness or contraction pain out of proportion to labor stage

›Foul-smelling amniotic fluid or vaginal discharge

›Fetal symptoms reported by the patient

›Perceived change in fetal movement

Labor and rupture of membranes history

›Membrane status

›Time of rupture of membranes

›Duration >= 18 hours strongly associated with intraamniotic infection

›Risk increases progressively with duration beyond 18 hours

›Fluid characteristics at rupture

›Clear versus meconium-stained versus foul-smelling

›Labor course

›Duration of labor

›Prolonged labor increases ascending infection risk

›Number of digital cervical examinations

›Risk increases with each additional exam after membrane rupture

›Internal monitoring use

›Intrauterine pressure catheter

03Physical Exam/exam36

Maternal vital signs and general appearance

›Vital sign targets

›Temperature

›>= 39.0 C single reading diagnostic threshold

›38.0 to 38.9 C confirmed on repeat within 30 minutes

›Heart rate

›Maternal tachycardia > 100 beats/min supports infection but is nonspecific in labor

›Blood pressure

›Hypotension suggests progression to septic shock

›Respiratory rate

›Tachypnea as an early sepsis marker

›General appearance

›Toxic or ill appearance

›Altered mental status as a red flag for sepsis

Abdominal and uterine exam

›Uterine findings

›Uterine fundal tenderness

›Key clinical finding supporting the diagnosis

›Distinguish from normal labor contraction discomfort

›Contraction pattern

›Adequacy for labor progress assessment

›Vaginal and cervical inspection

›Amniotic fluid or discharge character

›Purulent or foul-smelling fluid at the cervical os

›Cervical dilation and effacement

Fetal assessment

›Fetal heart rate pattern

›Baseline fetal tachycardia

04Differential Diagnosis/ddx20

Obstetric causes of maternal fever in labor

›Intraamniotic infection spectrum

›Isolated maternal fever

›ICD-10 O41.1 infection of amniotic sac and membranes

›Suspected Triple I

›Confirmed Triple I

›Placental abruption

›Painful bleeding

›Uterine tenderness overlaps with the infection presentation

›Postpartum endometritis

›Onset after delivery rather than during labor

Non-infectious and other mimics

›Epidural-associated fever

›Noninfectious inflammatory mechanism

›Diagnosis of exclusion once infection is judged less likely

›Urinary tract infection and pyelonephritis

›Flank pain, dysuria

›Common concurrent or alternative source in labor

›Appendicitis in pregnancy

›Displaced pain location from the gravid uterus

›Dehydration-related low-grade fever

›Resolves with hydration

05Laboratory Tests/lt32

Core infection and sepsis labs

›Complete blood count with differential

›Leukocytosis interpretation

›WBC physiologically elevated in labor — nonspecific alone

›Antenatal corticosteroids also raise WBC, confounding interpretation

›Marked left shift more specific for infection

›Blood cultures

›Obtain before antibiotics if feasible without delaying treatment

›Maternal bacteremia present in a minority of cases

›Do not delay antibiotics to obtain cultures

›Serum lactate

›Elevated >= 2 mmol/l suggests hypoperfusion

›Lactate physiologically elevated up to 4 mmol/l during active labor

›Repeat at 2 hours if initially elevated

Targeted microbiologic tests

›Amniotic fluid analysis if amniocentesis performed or fluid accessible

›Gram stain

›Presence of organisms supports confirmed Triple I

›Glucose

›Low amniotic fluid glucose supports infection

›Culture

›Confirms causative organism, guides de-escalation

›Group B streptococcus status

›Culture result or intrapartum screening status

›Colonization prevalence roughly 20 to 30% of pregnant patients

›Urinalysis and urine culture

›Rule out urinary source

06Diagnostic Tests/dt30

Scoring Systems

›Triple I diagnostic framework (2015 NICHD workshop, adopted by ACOG)

›Isolated maternal fever

›Fever meeting threshold without additional criteria

›Suspected Triple I

›Fever plus one of fetal tachycardia, maternal leukocytosis without corticosteroids, or purulent cervical fluid

›Confirmed Triple I

›Suspected Triple I plus positive amniotic fluid testing or placental pathology confirming infection or inflammation

›Kaiser Permanente neonatal early-onset sepsis calculator

›Incorporates maternal intrapartum risk factors including Triple I status

›Estimates newborn sepsis risk to guide evaluation intensity

›AAP-endorsed alternative to the categorical risk-factor approach

MRI

›Limited role in acute intrapartum evaluation

›Not used for chorioamnionitis diagnosis

›Diagnosis is clinical plus laboratory, not imaging-based

›Reserved for unrelated maternal abdominal pathology when ultrasound is nondiagnostic

›Minimal acute role

›Not indicated for uncomplicated chorioamnionitis

›Clinical and laboratory diagnosis is sufficient

›Reserved for postpartum complications

›Suspected pelvic abscess

›Suspected septic pelvic vein thrombophlebitis

›Persistent fever despite 48 to 72 hours of appropriate antibiotics after delivery

Ultrasound

›Obstetric ultrasound applications

›Fetal presentation and estimated fetal weight

07Disposition/dispo38

Delivery decision and level of care

›Delivery timing

›Triple I is not itself an indication for immediate cesarean

›Continue labor if maternal-fetal status is reassuring and progress is adequate

›Standard obstetric indications still govern route

›Nonreassuring fetal status

›Arrest of labor

›Level of maternal care

›Labor and delivery unit for uncomplicated Triple I

›ICU-level care

›Septic shock

›Vasopressor requirement

›Multi-organ dysfunction

Postpartum and neonatal disposition

›Maternal postpartum monitoring

›Continued fever surveillance

›Persistent fever after delivery raises concern for endometritis progression

›Postpartum hemorrhage from uterine atony

›Chorioamnionitis-associated myometrial inflammation impairs uterine contractility

›Active management of the third stage of labor and oxytocin administration standard regardless

›Wound infection surveillance if cesarean

›Incision inspection at each nursing assessment

›Sepsis surveillance

›Vital sign trending for 24 to 48 hours postpartum

›Neonatal disposition

›Well-appearing newborn with maternal Triple I exposure

›Risk-stratify using categorical risk factors or the sepsis risk calculator

›Enhanced observation per institutional protocol if low to intermediate risk

08Treatment/t110

Initial stabilization and sepsis bundle

›If maternal septic shock criteria are met

›IV access

›Two large-bore IV lines

›Fluid resuscitation

›30 mL/kg balanced crystalloid, reassess after each 500 mL to 1 L bolus

›Caution — pregnancy reduces plasma oncotic pressure, raising pulmonary edema risk with over-resuscitation

›Vasopressor therapy

›Norepinephrine 0.01 to 3 mcg/kg/min IV titrated to MAP >= 65 mmHg

›Titrate every 5 to 15 minutes to target

›First-line vasopressor despite theoretical uterine artery vasoconstriction — maternal perfusion is prioritized

›Oxygen supplementation

›Target SpO2 >= 95% for maternal and fetal oxygenation

›Routine supplemental oxygen without hypoxia not proven beneficial

Intrapartum antibiotic regimen

›Standard first-line regimen

›Ampicillin IV

›2 g IV every 6 hours

›Continue until delivery

›Gentamicin IV

›Traditional dosing 1.5 mg/kg IV every 8 hours

›Continue until delivery

›Once-daily dosing alternative 5 mg/kg IV every 24 hours

›Renal function monitoring during use

›Combination provides broad aerobic gram-positive, gram-negative, and GBS coverage

›Does not reliably cover anaerobes

Penicillin-allergy alternatives

›Non-severe allergy (rash without anaphylaxis)

›Cefazolin IV

›2 g IV every 8 hours plus gentamicin as above

›Severe allergy (anaphylaxis, angioedema)

›Clindamycin IV

›900 mg IV every 8 hours plus gentamicin as above

›Vancomycin IV alternative

›15 to 20 mg/kg IV every 8 to 12 hours plus gentamicin as above

›AUC-guided monitoring per institutional protocol

Cesarean delivery additional coverage

›Anaerobic coverage addition

›Clindamycin IV

›900 mg IV single dose at cord clamping

›Metronidazole IV alternative

›500 mg IV single dose at cord clamping

›Rationale

›Ampicillin-gentamicin alone does not reliably cover anaerobes encountered at cesarean

›Reduces risk of post-cesarean endometritis and wound infection

Postpartum antibiotic continuation

›Vaginal delivery

›Routine additional postpartum dosing generally not required

›Discontinue at delivery if maternal status is reassuring

›Cesarean delivery

›Practice varies — some protocols give one additional postpartum dose

›Extending beyond a single additional dose is not supported for uncomplicated cases

›Escalate to a full postpartum endometritis treatment course if fever persists after delivery

Delivery as definitive treatment

›Core principle

›Antibiotics alone do not resolve intraamniotic infection

›The source, the intrauterine contents, remains until delivery

›Delivery is not itself an urgent indication for cesarean

›Continue labor management with antibiotics running if maternal-fetal status permits

›Expedite delivery only for standard obstetric indications

›Nonreassuring fetal status

›Failure to progress

›Maternal decompensation

Iatrogenic harms and intervention-specific hazards

›Intubation

›Aspiration risk elevated from pregnancy physiology

›Rapid sequence induction preferred if airway management is required

›Sedation

›Exaggerated hypotension in the septic patient

›Reduce induction doses, anticipate vasopressor need

›Fluid loading

›Pulmonary edema risk from reduced plasma oncotic pressure in pregnancy

›Reassess after each bolus rather than a single large-volume resuscitation

›Oxygen

›Hyperoxia offers no proven benefit without hypoxia

›Target SpO2 >= 95%, avoid supraphysiologic titration

›Vasopressors

›Norepinephrine reduces uterine blood flow theoretically

›Still first-line — untreated maternal hypotension is the greater fetal threat

›Mechanical circulatory support, including intra-aortic balloon pump

›Not indicated in chorioamnionitis-related sepsis

›No cardiogenic component — reconsider the diagnosis if being considered

›Anticoagulation

›Postpartum VTE prophylaxis appropriate

›Therapeutic anticoagulation timing must be coordinated with anesthesia

›Neuraxial catheter placement or removal timing to avoid epidural hematoma

›Fibrinolysis

›Not indicated for chorioamnionitis

›No thrombotic indication from the infection itself

›Analgesia

›NSAIDs relatively avoided near term

›Oligohydramnios and premature ductus arteriosus constriction risk

›Opioids

›Fetal or neonatal respiratory depression risk if administered close to delivery

›Acetaminophen preferred for maternal fever and pain

›650 to 1000 mg PO/IV every 4 to 6 hours, maximum 4 g/day

Concurrent therapies and electrolyte monitoring

›Magnesium sulfate co-administration for preeclampsia or neuroprotection

›Electrolyte and cardiac effects

›ECG monitoring for PR interval prolongation and QRS widening with magnesium toxicity

›Deep tendon reflex loss precedes respiratory depression

›Gentamicin nephrotoxicity risk compounds magnesium clearance

›Renal function monitoring during concurrent use

›Gentamicin-associated renal impairment

›Hyperkalemia risk with acute kidney injury

›ECG changes — peaked T waves, widened QRS if severe

Refractory fever troubleshooting

›If fever persists despite 48 to 72 hours of appropriate antibiotics after delivery

›Reassess for postpartum endometritis progression

›Broaden coverage for enterococcus and resistant organisms

›Evaluate for pelvic abscess or septic pelvic vein thrombophlebitis

›CT abdomen and pelvis with contrast

›Wound source evaluation if post-cesarean

›Monitoring cadence during titrated therapy

›Norepinephrine infusion

›Reassess blood pressure and perfusion every 5 to 15 minutes during titration

›Gentamicin levels

›Peak and trough with traditional dosing, or trough only with once-daily dosing, per protocol

›Trough < 1 mg/L before the next once-daily dose

09Special Populations/sp49

Pregnancy

›Gestational age considerations

›Preterm chorioamnionitis

›Higher proportion of preterm deliveries associated with intraamniotic infection or inflammation, especially before 30 weeks

›Balances infection risk against prematurity risk when timing delivery

›Term chorioamnionitis

›More common overall given the much higher volume of term deliveries

›VTE prophylaxis

›Elevated postpartum thromboembolism risk with intraamniotic infection

›Sequential compression devices during labor and postpartum

›Pharmacologic prophylaxis per institutional protocol if prolonged immobility

›Antibiotic safety in pregnancy

›Ampicillin and gentamicin generally considered safe in pregnancy

›Avoid fluoroquinolones and tetracyclines in pregnancy

›Metronidazole considered safe beyond the first trimester per current obstetric guidance

Geriatric

›Advanced maternal age >= 35 years

›Higher baseline comorbidity burden

›Diabetes and hypertension more prevalent

›Higher cesarean delivery rate

›Increases downstream endometritis and wound infection risk when chorioamnionitis is also present

›Renal dosing considerations

›Gentamicin dose adjustment for reduced renal reserve

›Creatinine clearance calculation before dosing

Pediatrics

›Newborn risk from maternal chorioamnionitis

›Early-onset sepsis

›Maternal Triple I increases newborn early-onset sepsis risk several-fold above baseline

10Background/b43

Epidemiology

›Incidence

›Term deliveries

›Clinical chorioamnionitis complicates roughly 1 to 4% of term deliveries

›Preterm deliveries

›Intraamniotic infection or inflammation present in roughly 40 to 70% of deliveries before 30 weeks gestation

›Histologic chorioamnionitis on placental pathology

›Present in up to roughly 20% of term placentas, higher with decreasing gestational age

›Maternal and neonatal impact

›Maternal bacteremia

›Occurs in roughly 5 to 10% of clinical chorioamnionitis cases

›Neonatal early-onset sepsis

›Baseline incidence roughly 0.5 to 1 per 1000 term live births, several-fold higher with maternal Triple I exposure

›Colonization prevalence

›Group B streptococcus maternal colonization roughly 20 to 30%

›Bacterial vaginosis prevalence roughly 10 to 30% of pregnant patients depending on population

Pathophysiology

›Mechanisms of infection

›Ascending infection pathway

›Vaginal flora ascend through the cervix, the most common route

›Prolonged rupture of membranes removes the primary mechanical barrier

›Hematogenous spread

›Less common route, associated with Listeria monocytogenes

›Microbiology

›Polymicrobial predominance

›Ureaplasma urealyticum and Mycoplasma hominis

›Anaerobes — Bacteroides, Prevotella, Peptostreptococcus

›Aerobes — group B streptococcus, Escherichia coli, enterococci

11Patient Discharge Instructions/pdi24

copy discharge instructions

›Understanding your diagnosis

›You were treated for a uterine infection during labor called chorioamnionitis

›Antibiotics were given and delivery has resolved the source of infection

›Home care after discharge

›Take all prescribed antibiotics until finished, if any were prescribed at discharge

›Rest and gradual return to activity

›Pelvic rest, no intercourse, until cleared by your obstetric provider

›Drink plenty of fluids

›Warning signs — return to emergency immediately

›Fever returning after discharge

›Worsening lower abdominal or pelvic pain

›Heavy vaginal bleeding soaking more than one pad per hour

›Foul-smelling vaginal discharge

›Wound changes if a cesarean incision is present

›Increasing redness, swelling, drainage, or opening of the wound

›Difficulty breathing or chest pain

›Leg swelling or calf pain

›Confusion, severe headache, or difficulty speaking

›Newborn follow-up

›Your baby's care team will monitor for infection risk related to your diagnosis

›This may include blood tests or a period of observation

›Notify your pediatrician of your chorioamnionitis diagnosis and antibiotic exposure at your baby's first visit

›Follow-up instructions

›Obstetric follow-up appointment within 1 to 2 weeks of discharge

12References/r17

Guidelines and key sources

›Primary clinical references

›Higgins RD et al. Evaluation and Management of Women and Newborns With a Maternal Diagnosis of Chorioamnionitis: Summary of a Workshop. Obstetrics and Gynecology 2016

›Introduced the intrauterine inflammation or infection or both (Triple I) terminology and diagnostic framework

›American College of Obstetricians and Gynecologists. Committee Opinion: Intrapartum Management of Intraamniotic Infection

›Diagnostic criteria, antibiotic regimen, and delivery guidance

›Puopolo KM et al. AAP Clinical Report: Management of Neonates Born at >= 35 Weeks Gestation With Suspected or Proven Early-Onset Bacterial Sepsis. Pediatrics 2018

›Categorical risk-factor and sepsis risk calculator approaches to newborn risk assessment

›Escobar GJ et al. Development of the Kaiser Permanente Neonatal Early-Onset Sepsis Calculator

›Validated tool incorporating maternal intraamniotic infection status

›Supporting references

›Tita ATN, Andrews WW. Diagnosis and Management of Clinical Chorioamnionitis. Clinics in Perinatology 2010

›Review of microbiology, risk factors, and antibiotic regimens

›Society for Maternal-Fetal Medicine consult series on intraamniotic infection

›Coding references

›ICD-10 O41.1 infection of amniotic sac and membranes

›ICD-10 O85 puerperal sepsis

›ICD-10 P36 bacterial sepsis of newborn

Evidence & Review

Reviewed by SymptomDx Medical Team · Last reviewed September 13, 2026

SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.