Pediatrics (System-Integrated)

Croup: management and CCS-style severity assessment

Clinical Overview and When to Suspect Croup

— Parainfluenza virus type 1 is the most common cause (fall/early winter outbreaks)

— Parainfluenza 2/3, RSV, influenza A/B, adenovirus, SARS-CoV-2 (omicron variants notably worsen croup severity), human metapneumovirus, rhinovirus

— Recurrent or "spasmodic" croup suggests atopy/airway hyperreactivity rather than active infection

— Preschool child with abrupt nighttime onset of barky cough preceded by 1–2 days of coryza and low-grade fever

— Symptoms worse at night, improve in cool/humid air, often recur the following evening

— No drooling, no toxic appearance, no tripod positioning

— Mild ≤2, Moderate 3–7, Severe 8–11, Impending respiratory failure ≥12

Board pearl: A child with barky cough, no drooling, and improvement with cool night air is croup until proven otherwise — drooling, dysphagia, or toxicity should redirect you to epiglottitis, bacterial tracheitis, or retropharyngeal abscess, which demand a different airway algorithm and immediate ENT/anesthesia mobilization rather than nebulized epinephrine alone.

Croup (laryngotracheobronchitis) is a viral upper airway syndrome causing subglottic edema, presenting with the classic triad of barky "seal-like" cough, inspiratory stridor, and hoarseness, typically in children 6 months to 6 years (peak 6–36 months).

Etiology:

Pathophysiology: viral invasion of the subglottic mucosa → edema in the narrowest, least distensible part of the pediatric airway (cricoid ring). Even 1 mm of edema halves the cross-sectional area in an infant.

When to suspect on Step 3 / CCS:

Severity is a clinical bedside determination, not a lab diagnosis. The Westley Croup Score (0–17) operationalizes it: stridor, retractions, air entry, cyanosis, level of consciousness.

Epidemiology: ~3% of children annually; boys > girls 1.4:1; <5% require hospitalization, <1% intubation.

Presentation Patterns and Key History

— Barking/brassy cough ("seal bark") — pathognomonic descriptor on stems

— Inspiratory stridor — initially only with agitation/crying, then at rest as edema worsens

— Hoarse voice or cry (vocal cord involvement)

— Symptoms wax and wane, dramatically worse at night, often improve by the time the family reaches the ED

— Sudden nocturnal onset without preceding viral prodrome or fever

— Recurrent episodes in the same child, family history of atopy/asthma

— Resolves within hours; same acute treatment applies

— Onset timing, fever curve, drooling, dysphagia, voice changes

— Feeding and hydration status, urine output, activity level between episodes

— Immunization status — unimmunized child with stridor → consider diphtheria (membranous) or Hib epiglottitis

— Foreign body history: sudden choking event in a toddler with unilateral wheeze or focal stridor

— Prior intubation, subglottic stenosis, Down syndrome, prior croup episodes (>3 in a year suggests anatomic narrowing)

— Sick contacts, daycare exposure, SARS-CoV-2 status

— Toxic appearance, drooling, refusal to lie flat → epiglottitis

— High fever + worsening despite epinephrine → bacterial tracheitis

— Neck stiffness, trismus → retropharyngeal/peritonsillar abscess

Step 3 management: On a CCS case, before any procedure, order pulse oximetry, allow the child to remain in caregiver's lap, and avoid agitating maneuvers (no tongue blade, no IV in mild-moderate cases) — agitation acutely worsens dynamic airway collapse and can precipitate decompensation.

Classic prodrome: 1–3 days of rhinorrhea, nasal congestion, low-grade fever (<39°C), mild cough — looks like any URI.

Transition to croup syndrome (typically evenings, day 2–3):

Spasmodic croup variant:

Key history questions for the CCS interface:

Red-flag history requiring escalation:

Physical Exam Findings and Respiratory Assessment

— Alert, interactive, consolable → mild

— Anxious, fatiguing, paradoxical calm → impending failure

— Stridor: 0 none / 1 with agitation / 2 at rest

— Retractions: 0 none / 1 mild / 2 moderate / 3 severe

— Air entry: 0 normal / 1 decreased / 2 markedly decreased

— Cyanosis: 0 none / 4 with agitation / 5 at rest

— Level of consciousness: 0 normal / 5 altered

— Inspiratory stridor (extrathoracic obstruction) — biphasic stridor signals fixed or severe narrowing

— Suprasternal and subcostal retractions; nasal flaring, head bobbing in infants

— Lung fields typically clear — wheezing should prompt reconsideration (asthma, foreign body, anaphylaxis)

— Tachypnea, tachycardia proportional to severity and fever

— Decreased stridor with worsening retractions (less air movement, not improvement)

— Cyanosis, lethargy, decreased air entry

— Bradycardia in an infant — preterminal

— SpO₂ <92% on room air at rest

— Drooling, trismus, muffled "hot potato" voice → epiglottitis or deep neck space infection

— Unilateral findings, focal wheeze → foreign body

— Urticaria, angioedema, hypotension → anaphylaxis

Key distinction: A quiet, "comfortable-looking" child with less stridor but more accessory muscle use and rising HR is decompensating, not improving. This paradox is a classic Step 3 stem trap — the correct next step is nebulized racemic epinephrine + preparation for advanced airway, not reassurance.

General appearance drives triage more than any vital sign:

Westley Croup Score components (memorize for boards):

Respiratory exam specifics:

Ominous signs of impending respiratory failure:

What you should NOT see in pure croup:

Diagnostic Workup — Initial Evaluation

— Atypical presentation, age <6 months or >6 years

— Failure to respond to standard therapy

— Suspected foreign body, retropharyngeal abscess, or epiglottitis

— Recurrent croup (>2 episodes/year) → evaluate for subglottic stenosis or hemangioma

— AP neck: classic "steeple sign" — subglottic narrowing of the tracheal air column. Present in only ~50% and not required for diagnosis

— Lateral neck: rules out epiglottitis ("thumbprint sign") and retropharyngeal abscess (prevertebral soft tissue widening: >7 mm at C2 or >14 mm at C6 in children)

— Films must be obtained upright with caregiver present — never force a child with airway compromise to lie supine for imaging

— CBC, CRP, viral PCR do not change acute management

— Reserve for atypical/severe cases or suspected bacterial superinfection

Board pearl: The steeple sign is supportive, not diagnostic — its absence does not rule out croup, and its presence does not rule out epiglottitis. Trust the bedside exam over the X-ray, and never delay treatment of a moderately/severely distressed child to obtain imaging. If imaging is needed, the child must be continuously monitored with airway equipment immediately available.

Croup is a clinical diagnosis. Routine labs and imaging are not required in typical cases and may agitate the child, worsening obstruction.

Pulse oximetry: obtain in all but the mildest cases; do not rely on it as a primary severity marker — desaturation is a late finding because of preserved gas exchange until obstruction is severe.

When to image (selective):

Plain radiographs:

Labs are generally not indicated:

Blood gas: avoid in mild–moderate croup; the stress of phlebotomy can precipitate decompensation. Reserve for severe cases where intubation is being considered.

Diagnostic Workup — Advanced and Confirmatory Studies

— Indicated for atypical, recurrent, or persistent stridor

— Performed in controlled setting (OR) if epiglottitis or significant compromise suspected

— Identifies subglottic stenosis, laryngomalacia, vocal cord paralysis, hemangioma, papillomatosis

— Flexible bronchoscopy to assess subglottic anatomy

— Consider GERD workup (pH/impedance study) — acid reflux contributes to subglottic inflammation

— Consider allergy/atopy evaluation in spasmodic recurrence pattern

— Airway fluoroscopy if dynamic obstruction (tracheomalacia) suspected

— Multiplex respiratory PCR (parainfluenza, RSV, influenza, SARS-CoV-2, adenovirus) — does not alter ED management but supports cohorting and infection control in admitted patients

— Influenza testing if antiviral therapy (oseltamivir) is being considered for high-risk children

— Reserved for suspected retropharyngeal/parapharyngeal abscess or mass

— Not for routine croup

— Consider in recurrent stridor with feeding difficulty — vascular ring or sling (e.g., double aortic arch) can mimic recurrent croup

— Flow-volume loops show flattened inspiratory limb in fixed extrathoracic obstruction — useful in adolescents with recurrent stridor to distinguish from vocal cord dysfunction or asthma

Step 3 management: A child with ≥3 croup episodes in a year, persistent biphasic stridor between episodes, or croup outside the typical age window (6 mo–6 yr) warrants outpatient ENT referral for flexible laryngoscopy after the acute episode resolves. This is a high-yield ambulatory disposition decision: don't just discharge with reassurance — schedule the workup.

Direct laryngoscopy / flexible nasopharyngoscopy (ENT):

Recurrent croup evaluation (≥2 episodes, especially <3 yrs or >6 yrs):

Viral testing:

CT neck with contrast:

Echocardiogram / aortic imaging:

Pulmonary function testing (older children):

Severity-Based Management Algorithm

— Dexamethasone 0.6 mg/kg PO × 1 (max 16 mg); 0.15 mg/kg is also acceptable per recent data

— Cool mist has no proven benefit in trials but is low-risk

— Discharge home with return precautions; observe 30–60 min if any concern

— Dexamethasone 0.6 mg/kg PO/IM/IV

— Nebulized racemic epinephrine 2.25% 0.5 mL in 3 mL NS (or L-epinephrine 1 mg/mL, 5 mL)

— Observe ≥3–4 hours after epinephrine — risk of rebound stridor as drug wears off

— Discharge if at baseline, tolerating PO, reliable caregiver

— Repeat nebulized epinephrine q15–20 min as needed

— Dexamethasone IV/IM if not tolerating PO

— Heliox (70:30) can be considered as a bridge

— Admit; ICU if persistent severe symptoms or >2 epi doses needed

— Call anesthesia/ENT for controlled airway in OR if possible

— Smaller ETT (0.5–1 mm below age-predicted) due to subglottic edema

— Avoid agitation; minimize interventions until airway team present

CCS pearl: On the CCS interface, the correct order set for moderate croup is: pulse oximetry → dexamethasone PO → nebulized racemic epinephrine → observe 3–4 hours → reassess Westley score → disposition. Skipping the observation window after epinephrine and discharging immediately is a classic CCS error that produces a return-visit penalty.

All severities receive dexamethasone. Severity dictates the addition of nebulized epinephrine and disposition.

Mild croup (Westley ≤2) — barky cough, no stridor at rest, no/mild retractions:

Moderate croup (Westley 3–7) — stridor at rest, moderate retractions, no agitation:

Severe croup (Westley 8–11) — stridor at rest, marked retractions, agitation, hypoxia:

Impending failure (Westley ≥12):

Pharmacotherapy — Dexamethasone and Glucocorticoids

— Dose: 0.6 mg/kg × 1 (maximum 16 mg), PO preferred — equivalent bioavailability to IV

— Alternative dosing: 0.15 mg/kg shown non-inferior in mild–moderate disease in multiple RCTs

— Onset of action: 2–3 hours; duration 2–4 days (long half-life covers the typical symptom course)

— IM route if vomiting or refusing PO; IV if already access established

— Prednisolone 1–2 mg/kg PO × 1–2 days — shorter half-life, higher return-visit rate vs dexamethasone

— Nebulized budesonide 2 mg — equivalent efficacy to oral dex; useful if child cannot tolerate PO and IV access is being avoided; more expensive

— Single-dose dexamethasone is remarkably safe; transient hyperglycemia, behavioral changes uncommon

— Avoid in active varicella exposure without immunity and recent live-vaccine considerations (theoretical, not absolute)

— No evidence of growth suppression or adrenal effects from single dose

— Racemic 2.25% 0.5 mL in 3 mL NS or L-epinephrine 1:1000, 0.5 mL/kg (max 5 mL) — equivalent efficacy

— Onset 10 min; peak 30 min; duration ~2 hours → mandatory observation period

Board pearl: A common stem trap is offering "nebulized epinephrine alone" for moderate croup — this treats symptoms but not the underlying inflammation, and the patient returns when the drug wears off. Dexamethasone is given to every croup patient, regardless of whether epinephrine is also administered.

Dexamethasone is the cornerstone of croup therapy at all severities.

Mechanism: reduces airway mucosal edema and inflammation via genomic glucocorticoid effects; decreases need for repeat epinephrine, reduces hospitalization, shortens symptom duration, fewer return visits.

Alternative steroids (used when dexamethasone unavailable):

Why a single dose works: dexamethasone's biological half-life (36–72 hr) typically outlasts the natural disease course.

Safety profile:

Nebulized epinephrine (adjunct, not steroid replacement):

Airway Management and Procedural Escalation

— Do not agitate the child — preserve spontaneous ventilation

— Mobilize anesthesia and ENT early when severe

— Ideally intubate in the OR with inhalational induction (sevoflurane), maintaining spontaneous respirations

— Have a surgical airway tray ready (cricothyrotomy/tracheostomy backup)

— Use a tube 0.5–1.0 mm smaller than age-predicted (age/4 + 4 for uncuffed; age/4 + 3.5 for cuffed)

— Subglottic edema makes the standard size too large; forcing it risks post-extubation stenosis

— Confirm air leak at <25 cm H₂O before securing — presence of leak predicts successful extubation

— Air leak around tube at low pressure

— Resolution of fever, decreased secretions

— Typically extubate within 24–72 hours

— Pre-extubation dexamethasone may reduce post-extubation stridor

— Reduces work of breathing via lower-density laminar flow

— Useful bridge in severe croup awaiting steroid effect or transfer

— Limited if FiO₂ requirement >30%

— No sedation in spontaneously breathing children with airway compromise outside controlled settings

— No blind oral airway placement — risk of laryngospasm

— Avoid albuterol (no role; can worsen agitation)

CCS pearl: When CCS croup cases escalate, the correct sequence is call anesthesia, call ENT, move to OR/ICU, prepare smaller ETT, maintain spontaneous ventilation — NOT rapid-sequence intubation in the ED. RSI in unrecognized severe subglottic obstruction can produce "can't intubate, can't ventilate" disaster and is a tested error.

Most croup is managed without procedural intervention. Less than 1% require intubation.

Pre-intubation principles:

Endotracheal tube selection:

Extubation criteria:

Heliox (70% helium / 30% oxygen):

What to avoid:

Special Populations — Infants and Comorbid Airway Conditions

— Laryngomalacia (most common cause of infant stridor; positional, improves prone)

— Subglottic hemangioma (cutaneous "beard distribution" hemangiomas → look in airway)

— Vocal cord paralysis (post-cardiac surgery, birth trauma)

— Vascular ring/sling (stridor + feeding difficulty)

— Subglottic stenosis (especially prior NICU intubation history)

— Narrower baseline subglottic airway + hypotonia → present with more severe symptoms at lower edema burden

— Use even smaller ETT if intubation required

— Lower threshold for admission and observation

— Acquired subglottic stenosis → recurrent or severe croup-like episodes

— Refer to pediatric otolaryngology after acute episode resolves

— Bypasses subglottic narrowing — true croup unlikely to cause obstruction

— Stridor in trach patient → suprastomal granulation, tube obstruction, or upper airway pathology

— Single-dose dexamethasone safe in renal/hepatic dysfunction; no adjustment needed

— Nebulized epinephrine: monitor for tachyarrhythmia in children with congenital heart disease, particularly HOCM or severe LVOT obstruction

— Higher risk for bacterial superinfection (tracheitis), atypical pathogens

— Lower threshold for admission, imaging, broader workup

— Steroids still indicated; benefit outweighs immune modulation risk in acute airway obstruction

Board pearl: Stridor in an infant <6 months should never be reflexively called croup. The stem is testing anatomic and congenital causes; the correct next step is usually flexible nasopharyngoscopy and ENT referral, not a trial of dexamethasone.

Infants <6 months with stridor — croup is uncommon; broaden differential aggressively:

Children with Down syndrome:

Prior prolonged intubation / NICU graduates:

Children with tracheostomy:

Renal/hepatic impairment in pediatrics:

Immunocompromised children:

Special Populations — Recurrent Croup, Atopy, and SARS-CoV-2

— Affects ~5% of children with croup history

— Associated with atopy, asthma, GERD, and subtle anatomic narrowing

— Workup after resolution: flexible laryngoscopy/bronchoscopy, consider GERD evaluation, allergy testing

— Long-term inhaled corticosteroids are not standard but may be considered if asthma coexists

— Sudden nighttime stridor without viral prodrome or fever

— Often recurrent, family history of atopy

— Same acute treatment as viral croup (dexamethasone ± epinephrine)

— Disproportionately affects unvaccinated young children

— Often more severe, higher rates of requiring multiple epinephrine doses, longer observation

— Same treatment algorithm applies: dexamethasone + epinephrine; isolation precautions

— Higher admission rates documented in case series

— Adds risk for bacterial tracheitis (often Staph aureus)

— Consider oseltamivir in high-risk children within 48 hours of onset

— Ensure Hib and DTaP up to date — protects against epiglottitis and diphtheria, which mimic croup

— Annual influenza and COVID-19 vaccination per CDC schedule reduce croup severity/incidence

— No direct croup issue, but counsel on respiratory hygiene in household; pregnant household members exposed to influenza/COVID should follow standard maternal antiviral guidance

Step 3 management: A child with third croup episode in 12 months should be referred to pediatric ENT for outpatient flexible laryngoscopy between episodes. Also screen for GERD symptoms (frequent regurgitation, arching, feeding aversion) and consider empiric PPI trial only with documented reflux — not as reflexive treatment.

Recurrent croup (≥2 episodes/year):

Spasmodic croup:

SARS-CoV-2–associated croup (Omicron era):

Influenza co-infection:

Pediatric vaccination considerations:

Pregnant caregivers:

Complications and Adverse Outcomes

— Respiratory failure requiring intubation (<1% of cases)

— Hypoxic injury if obstruction unrecognized — bradycardia is a preterminal sign in infants

— Pneumothorax/pneumomediastinum from forceful inspiratory effort against obstruction

— Post-obstructive pulmonary edema (negative-pressure pulmonary edema) — develops after airway relief; presents with hypoxia and pink frothy sputum minutes to hours later

— Dehydration from poor PO intake during illness

— Bacterial tracheitis (Staph aureus, GAS, Strep pneumoniae, Moraxella)

— Suspect when fever persists or worsens, toxic appearance, failure to respond to epinephrine, copious purulent secretions

— Requires bronchoscopy for diagnosis and pseudomembrane removal, IV antibiotics (e.g., vancomycin + ceftriaxone), often intubation

— Subglottic stenosis (especially with oversized tube or prolonged intubation)

— Vocal cord injury, granulation tissue

— Racemic epinephrine: transient tachycardia, hypertension, tremor; rare arrhythmia

— Steroid single-dose: minimal AEs; transient hyperglycemia, mood changes

— Rebound stridor after epinephrine wears off (~2 hr) — the reason for mandatory observation

— Mortality <0.5% with appropriate management

— Most children fully recover within 3–7 days

— Recurrent croup in 5%; persistent airway hyperreactivity in subset

Key distinction: Bacterial tracheitis vs croup — both have stridor and barky cough, but tracheitis features high fever, toxic appearance, no response to nebulized epinephrine, and thick purulent tracheal secretions. Failure to recognize this distinction is dangerous: tracheitis requires bronchoscopy, IV antibiotics, and often intubation, not just more steroids.

Acute complications:

Bacterial superinfection:

Post-intubation complications:

Medication-related:

Outcome data:

Escalation, Admission, and Disposition

— No stridor at rest for ≥3 hours after last epinephrine dose

— SpO₂ ≥94% on room air

— Tolerating oral fluids

— Normal mental status

— Reliable caregiver with transportation and ability to return

— Received dexamethasone

— Persistent stridor at rest after 2 epinephrine doses + dexamethasone

— Required >1 epinephrine treatment with incomplete response

— Hypoxia, dehydration, poor PO intake

— Age <6 months with significant symptoms

— Significant comorbidity (Down syndrome, prior subglottic stenosis, CHD)

— Unreliable follow-up or distance from medical care

— Westley score ≥8 despite treatment

— Required >2 epinephrine doses in close succession

— Impending respiratory failure, altered mental status

— Need for heliox, BiPAP, or continuous monitoring

— Suspected bacterial tracheitis or epiglottitis (these go to PICU regardless)

— Anesthesia + ENT for severe croup with potential airway intervention

— Pediatric ENT outpatient for recurrent croup workup

— Pediatric pulmonology for atypical or recurrent presentations

— Community ED without pediatric ICU → stabilize with steroid + epinephrine, call accepting facility before deterioration, transport with airway-capable team

CCS pearl: The 5-minute clock on CCS rewards timely escalation: if a moderate croup case doesn't improve after the second nebulized epinephrine within 30 minutes, the next action is admit to PICU and consult anesthesia/ENT — not a third epinephrine in the ED. Delayed escalation produces case penalty.

Discharge criteria (after standard treatment + observation):

Admit to general pediatric floor:

Admit to PICU:

Consults:

Transfer considerations:

Key Differentials — Other Causes of Pediatric Stridor

— Now rare due to Hib vaccine; persists in unvaccinated children and adults

— Pathogens: Hib (classic), Strep pneumoniae, GAS, Staph aureus

— Toxic, drooling, dysphagic, "tripod" position, muffled voice, high fever

— Minimal cough (vs croup's prominent cough)

— Lateral neck X-ray: "thumbprint sign" — but do not delay airway control for imaging

— Management: OR with anesthesia/ENT for controlled intubation, then IV ceftriaxone ± vancomycin

— Often follows viral URI (Staph aureus most common)

— High fever, toxic appearance, poor response to epinephrine, thick purulent secretions

— Bronchoscopy diagnostic; intubation often required

— Usually <5 years old; fever, neck stiffness, drooling, limited neck extension

— Lateral neck X-ray: prevertebral soft tissue widening (>7 mm at C2 or >14 mm at C6)

— CT confirms; IV antibiotics + surgical drainage

— Older children/adolescents; trismus, "hot potato voice," uvular deviation

— Drainage + antibiotics

— Unimmunized child; gray pseudomembrane on tonsils/pharynx

— Diphtheria antitoxin + erythromycin/penicillin; mandatory reporting

— Sudden onset choking, often during eating/play

— Toddlers; focal wheeze or stridor

— Rigid bronchoscopy for removal

Key distinction: Cough character is your fastest discriminator — barky cough = croup; minimal cough + drooling + toxicity = epiglottitis; sudden choking event = foreign body; fever + toxic + no response to epi = bacterial tracheitis. These four pathways have radically different airway management.

Epiglottitis (supraglottitis):

Bacterial tracheitis:

Retropharyngeal abscess:

Peritonsillar abscess:

Diphtheria:

Laryngeal/tracheal foreign body:

Key Differentials — Non-Infectious and Allergic Causes

— Acute onset, urticaria, angioedema, wheeze, hypotension, exposure history

— Treatment: IM epinephrine 0.01 mg/kg (max 0.3 mg) in lateral thigh — not nebulized

— H1/H2 blockers, steroids, fluids, observation 4–8 hours minimum

— Discharge with epinephrine autoinjector prescription and allergy referral

— Less common in young children unless on ACE-I or family history

— Hereditary angioedema: C1 esterase inhibitor deficiency, recurrent without urticaria

— Toddlers; choking event, unilateral decreased breath sounds, focal wheeze

— Inspiratory/expiratory or decubitus films may show air trapping

— Rigid bronchoscopy is diagnostic and therapeutic

— Older children/adolescents; mimics asthma, no response to bronchodilators

— Flow-volume loop: flattened inspiratory limb

— Speech therapy is mainstay treatment

— Smoke inhalation, caustic ingestion → mucosal edema

— Singed nasal hairs, soot, hoarse voice → early intubation before edema worsens

— Blunt neck trauma → laryngeal fracture, hematoma

— Penetrating injury → airway disruption

— Thyroid mass, lymphoma, mediastinal mass — usually subacute

— Anterior mediastinal mass: risk of airway collapse with supine positioning or sedation

Board pearl: Stridor + urticaria/angioedema = anaphylaxis, not croup — give IM epinephrine, not nebulized. Reflexively reaching for racemic epinephrine in an anaphylactic child is a common stem trap and undertreats the systemic reaction.

Anaphylaxis with laryngeal edema:

Angioedema (ACE-inhibitor or hereditary):

Foreign body aspiration:

Vocal cord dysfunction (paradoxical vocal fold motion):

Thermal/caustic airway injury:

Trauma:

Mass effect:

Discharge Plan, Return Precautions, and Outpatient Continuity

— No routine prescription needed after single-dose dexamethasone — effect lasts 2–4 days, covering typical illness course

— No outpatient steroid taper required

— No prophylactic antibiotics (croup is viral)

— Antipyretics PRN: acetaminophen 15 mg/kg q4–6h or ibuprofen 10 mg/kg q6–8h (>6 months)

— Cool mist/humidified air or stepping outside into cool night air — anecdotal benefit, low risk

— Hydration: small frequent sips; popsicles, electrolyte solutions

— Upright positioning when symptomatic; allow comfort in caregiver's arms

— Avoid cough suppressants and decongestants in children <6 (and limited utility <12)

— Stridor at rest (especially worsening)

— Retractions, nasal flaring, head bobbing

— Cyanosis, pallor, lethargy

— Drooling, inability to swallow

— Persistent high fever >72 hours or worsening fever after initial improvement

— Dehydration: <3 wet diapers/day, dry mucous membranes, no tears

— Symptoms typically peak day 2–3, resolve over 3–7 days

— Cough may persist 1–2 weeks

— Symptoms often worsen at night even with treatment — anticipatory guidance reduces unnecessary returns

— Ensure up-to-date on Hib, DTaP, influenza, COVID-19, pneumococcal

Step 3 management: Discharge instructions must explicitly include "return immediately if your child has stridor at rest, struggles to breathe, drools, or becomes lethargic." This structured return precaution counseling is a documented patient safety standard and a tested CCS-style ambulatory competency.

Discharge medications:

Supportive care counseling:

Return-to-ED precautions (must be reviewed with caregivers):

Expected course:

Vaccination reinforcement at discharge:

Follow-Up, Monitoring, and Anticipatory Guidance

— Most uncomplicated croup needs no scheduled follow-up beyond return precautions

— PCP visit within 2–3 days if symptoms persist, child was admitted, or caregiver concern

— Telephone/telehealth follow-up reasonable for moderate cases

— PCP visit within 1 week of discharge

— Review residual cough, feeding, sleep

— Confirm immunizations updated

— ≥2 episodes/year or >3 lifetime → pediatric ENT referral for elective flexible laryngoscopy

— Consider GERD evaluation if reflux symptoms; empiric PPI trial only with documented evidence

— Allergy/asthma evaluation if atopic history

— Continuous pulse oximetry

— Vital signs q1–4h based on severity

— Westley score reassessment q2–4h

— Strict I/O if dehydration concern

— Daily weight if prolonged stay

— Croup is viral and self-limited; tends to recur at night for several evenings

— Cool air exposure and calm reassurance are appropriate first responses

— Vaccine counseling: emphasize Hib, influenza, COVID-19 — these reduce risk of croup mimics and severity

— No smoke exposure in the home — secondhand smoke worsens airway disease

— Document return precautions reviewed

— Verify caregiver understanding ("teach-back" method)

— Confirm reliable transportation and phone access

CCS pearl: On longitudinal CCS-style management, scheduling a 48–72 hour follow-up call or visit after moderate croup discharge is a high-yield order. It catches delayed worsening, dehydration, and post-discharge bacterial superinfection — and demonstrates the "transition-of-care" competency Step 3 emphasizes.

Routine follow-up:

After hospitalization:

Recurrent croup follow-up:

Monitoring parameters during admission:

Anticipatory guidance for caregivers:

Quality measures and safety nets:

Ethical, Legal, and Patient Safety Considerations

— Intubation in pediatric airway emergency — implied consent under emergency doctrine if caregiver unavailable; document attempts to reach guardian

— For elective laryngoscopy/bronchoscopy in recurrent croup workup, both parents (when applicable) or legal guardian must provide consent; minor assent for older children

— Caregiver refusing dexamethasone or admission for a child with severe croup → invoke pediatric medical neglect protocols if refusal places child at significant risk

— Engage social work, ethics consult, and in extreme cases emergency protective custody/court order for life-threatening situations

— Suspected foreign body aspiration with caregiver concealment of supervision lapse — not automatically reportable, but pattern of injuries or neglect requires CPS notification

— Concomitant burns, bruises, or inconsistent history → mandatory child abuse reporting

— Post-epinephrine rebound is a documented safety event — early discharge before observation period is a sentinel-event-class error

— Communication failure at ED-to-floor handoff: explicitly transmit Westley score, number of epinephrine doses, time of last dose, steroid administration time

— ED-to-home transition: structured discharge instructions, teach-back, contact information

— Higher croup-related ED utilization in lower-SES populations — consider access to outpatient follow-up, primary care, telehealth resources

— Language-concordant return precautions (use qualified medical interpreters, not family members)

— Document discussion using CDC AFIX/AAP framework; provide VIS materials; respect parental autonomy while informing of risks

— Hib refusal is particularly relevant — increases risk of epiglottitis mimicking croup

Board pearl: "Discharged home after one nebulized epinephrine without observation" is a Step 3 patient-safety failure pattern. The minimum standard is 3–4 hour observation post-epinephrine before discharge — failure to document this is the medico-legal vulnerability.

Informed consent for procedures:

Refusal of treatment:

Mandatory reporting:

Patient safety during transitions:

Disparities and access:

Vaccine refusal counseling:

High-Yield Associations and Rapid-Fire Facts

Key distinction: Westley ≤2 = home with dex; Westley 3–7 = dex + epi + observe; Westley ≥8 = admit, repeat epi, consider PICU; Westley ≥12 = OR airway team. Memorize these four thresholds — they map directly to disposition stems.

Parainfluenza type 1 = #1 cause of croup; fall/early winter peaks

Age range: 6 months to 6 years; peak 6–36 months

Boys > girls, ~1.4:1

Westley score: stridor, retractions, air entry, cyanosis, mental status (max 17)

Steeple sign = subglottic narrowing on AP neck X-ray (croup)

Thumbprint sign = epiglottic swelling on lateral neck (epiglottitis)

Prevertebral widening (>7 mm C2, >14 mm C6) = retropharyngeal abscess

Dexamethasone 0.6 mg/kg PO/IM/IV × 1 (max 16 mg) — universal first-line for all severities

Racemic epinephrine 2.25%, 0.5 mL in 3 mL NS OR L-epi 1:1000, 0.5 mL/kg (max 5 mL) — equivalent

Observation ≥3 hours after epinephrine before discharge

Decreased stridor with worsening retractions = decompensation, not improvement

Cool mist — no proven benefit but commonly recommended as low-risk supportive measure

Cough character matters: barky = croup; no cough + drooling = epiglottitis

No response to epinephrine = think bacterial tracheitis

Recurrent croup (>2/year) = refer ENT for flexible laryngoscopy

Down syndrome = narrower airway baseline, lower threshold for admission, smaller ETT

SARS-CoV-2 Omicron = increased croup severity in unvaccinated children

Hib vaccine dramatically reduced epiglottitis incidence

Subglottis = narrowest part of pediatric airway (cricoid ring)

Air leak around ETT at <25 cm H₂O = readiness to extubate

Post-extubation stridor prevention: pre-extubation dexamethasone

Nebulized budesonide 2 mg = alternative if PO dex not tolerated

Acquired subglottic stenosis in NICU graduates → recurrent croup pattern

Spasmodic croup: sudden, no prodrome, recurrent, atopic association

Board Question Stem Patterns

Step 3 management: When stems describe "worsening fatigue with quieter stridor and rising heart rate," the answer is virtually always escalate airway management — never reassurance. Pattern recognition of this "deceptive calm" is high-yield.

Stem 1: 2-year-old, 2 days of URI, awakens at night with barky cough and inspiratory stridor, sats 96%, no drooling. → Dexamethasone 0.6 mg/kg PO (mild croup; observe briefly, discharge with precautions).

Stem 2: 18-month-old with stridor at rest, suprasternal retractions, sats 93%. → Dexamethasone + nebulized racemic epinephrine + observe 3–4 hours. Trap answer: "give nebulized epinephrine alone" or "give albuterol."

Stem 3: 4-year-old, unimmunized, sudden high fever, drooling, tripod position, muffled voice, minimal cough. → Call anesthesia/ENT, intubate in OR, then ceftriaxone + vancomycin. Diagnosis: epiglottitis. Trap: ordering lateral neck X-ray first.

Stem 4: 3-year-old with 3rd croup episode this year, biphasic stridor between episodes. → Refer to pediatric ENT for flexible laryngoscopy (rule out subglottic stenosis, hemangioma). Trap: another round of dex without workup.

Stem 5: 5-year-old with croup symptoms, given epi and dex; 4 hours later persistent high fever, toxic appearance, no improvement, copious purulent secretions. → Bacterial tracheitis: bronchoscopy, IV vancomycin + ceftriaxone, ICU admission.

Stem 6: 2-year-old given 1 nebulized epi, looks great 30 minutes later; physician considers discharge. → Continue observation for ≥3 hours; rebound stridor risk. Trap: immediate discharge.

Stem 7: 1-month-old with chronic positional stridor, improves prone, feeding well. → Laryngomalacia; reassure, flexible laryngoscopy if severe. Not croup.

Stem 8: Toddler with sudden choking during snack, then focal wheeze. → Rigid bronchoscopy; foreign body. Trap: "treat as croup."

Stem 9: 3-year-old with stridor, urticaria, hypotension after peanut exposure. → IM epinephrine 0.01 mg/kg lateral thigh, NOT nebulized.

Stem 10: Severe croup, multiple epi doses, worsening despite therapy. → PICU + anesthesia for controlled airway in OR with smaller ETT.

One-Line Recap

Croup is a clinical diagnosis of viral subglottic edema causing barky cough, inspiratory stridor, and hoarseness in children 6 months to 6 years — every patient gets a single dose of dexamethasone 0.6 mg/kg, moderate-to-severe disease adds nebulized racemic epinephrine with mandatory 3–4 hour observation, and disposition follows the Westley score.

Board pearl: If you remember only one algorithm: dexamethasone for all, epinephrine for moderate/severe, observe before discharge, escalate airway in the OR for impending failure, and always interrogate the stem for drooling, toxicity, sudden onset, or urticaria — because those words mean it isn't croup.

Universal therapy: dexamethasone 0.6 mg/kg PO/IM/IV × 1 (max 16 mg) — works at all severities, single dose covers full course

Severity-driven escalation: Westley ≤2 home; 3–7 add nebulized epi + observe; ≥8 admit; ≥12 OR airway with anesthesia/ENT

Recognize the mimics: drooling + toxic + no cough = epiglottitis; toxic + no response to epi = bacterial tracheitis; sudden choking = foreign body; urticaria + hypotension = anaphylaxis (IM epi, not nebulized)

Safety nets that win CCS cases: observe ≥3 hours post-epinephrine, structured return precautions with teach-back, ENT referral for recurrent croup (≥2/year), and never discharge a child whose "calm with rising HR and quiet stridor" signals decompensation