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Approach to the Critical Patient
Immediate risk stratification
Severity and stabilization priorities
Toxic appearance
Altered mental status
Exhaustion
Poor air entry
Airway and breathing red flags
Stridor at rest
Severe retractions
Cyanosis
Apnea
High-risk contexts
Age < 6 months
Known airway anomaly
Prior intubation for croup
Monitoring and environment
Monitoring and setup
Continuous pulse oximetry for moderate to severe disease
SpO2 trend over spot checks
Cardiorespiratory monitoring when nebulized epinephrine used
Tachyarrhythmia risk
Minimal agitation approach
Parent present
Avoid painful procedures until stabilized
Immediate actions and escalation
Time-critical actions
If impending respiratory failure, escalate to resuscitation bay
Airway team activation
Difficult airway equipment
If severe croup, nebulized epinephrine first-line temporizing therapy
Reassessment at 10-20 minutes
Systemic corticosteroid for all severities
Early administration
If oxygenation failure, supplemental oxygen by least-distressing method
Blow-by oxygen
Face mask if tolerated
Key concepts
Core bedside concepts
Viral upper airway inflammation with subglottic edema
Fixed narrowest pediatric airway segment
Symptoms peak at night and over first 1-3 days
Typical course 3-7 days
Barky cough and inspiratory stridor
Hoarseness
Nebulized epinephrine rapid onset and short duration
Observation required for recurrence after effect wanes
History
Presenting pattern
Symptom timeline and pattern
Barky cough
Nocturnal worsening
Stridor
At rest versus with agitation
Voice change
Hoarseness
Fever
Low-grade typical
URI prodrome
Rhinorrhea
Sore throat
Severity cues and risk factors
High-risk history features
Poor oral intake or dehydration
Reduced urine output
Apnea episodes
Color change
Prior severe episodes
Prior nebulized epinephrine
Prior ICU admission
Comorbidities
Prematurity history
Chronic lung disease
Neuromuscular weakness
Immunocompromise
Alternative diagnosis cues
Red flags for non-croup etiologies
Drooling
Dysphagia
Muffled voice
Hot potato voice
Sudden onset after choking
Foreign body aspiration
Urticaria or facial swelling
Anaphylaxis or angioedema
Toxic appearance with high fever
Bacterial tracheitis
Unimmunized status
Epiglottitis risk
Physical Exam
Airway and work of breathing
Respiratory assessment domains
Stridor characterization
Inspiratory
Biphasic
Retractions
Suprasternal
Intercostal
Subcostal
Air entry
Symmetry
Diminished breath sounds
Respiratory rate relative to age
Tachypnea threshold by age
General and HEENT findings
Key examination findings
Mental status
Irritability
Lethargy
Hydration status
Capillary refill
Mucous membranes
Oropharynx
Tonsillar exudate absence typical
Drooling presence atypical
Fever degree
High fever concern for bacterial process
PITFALLS
Common pitfalls
Quiet child with minimal stridor
Impending fatigue and airway failure
Agitation-induced worsening
Avoid repeated distressing exams
Wheeze-focused framing
Upper airway obstruction primary process
Differential Diagnosis
Life-threatening and cannot-miss
Emergent mimics
Epiglottitis
ICD-10 J05.1
Drooling
Tripod positioning
Bacterial tracheitis
ICD-10 J04.1
Toxic appearance
Poor response to epinephrine
Foreign body aspiration
ICD-10 T17.9
Sudden onset
Focal decreased air entry
Anaphylaxis or angioedema
ICD-10 T78.2
Urticaria
Hypotension
Common alternatives
Non-emergent alternatives
Asthma or viral wheeze
ICD-10 J45.9
Expiratory wheeze predominant
Retropharyngeal abscess
ICD-10 J39.0
Neck stiffness
Drooling
Peritonsillar abscess
ICD-10 J36
Uvula deviation
Trismus
Diphtheria
ICD-10 A36
Pseudomembrane
Coding and terminology
Primary diagnosis coding
Croup
ICD-10 J05.0
SNOMED CT concept
Acute laryngotracheitis
ICD-10 J04.2
SNOMED CT concept
Laboratory Tests
When labs help
Lab testing indications and limits
Routine labs usually unnecessary
Clinical diagnosis predominates
If toxic appearance, sepsis concern, or alternative diagnosis
Targeted testing
Targeted labs for atypical or severe cases
Targeted laboratory options
Venous or capillary blood gas for impending failure
Rising CO2
Respiratory acidosis
Serum glucose for altered mental status
Hypoglycemia exclusion
C-reactive protein or procalcitonin in suspected bacterial tracheitis
Adjunctive only
Blood cultures in suspected bacterial tracheitis or sepsis
Pre-antibiotics when feasible
Pitfalls
Lab-related pitfalls
Delays from low-yield testing
Increased agitation risk
Normal labs do not exclude epiglottitis or foreign body
Clinical priority
Diagnostic Tests
Scoring Systems
Westley croup score
Components
Level of consciousness
Cyanosis
Stridor
Air entry
Retractions
Severity interpretation
0-2 mild
3-5 moderate
6-11 severe
12+ impending respiratory failure
Clinical use
Trend over time
Response to therapy documentation
MRI
MRI considerations
Not routine for croup
Time and sedation burden
Rare indications
Suspected deep neck space infection when CT contraindicated
Safety constraints
Sedation risk in upper airway obstruction
CT
CT considerations
Not routine for typical croup
Diagnosis primarily clinical
If concern for deep neck infection or abscess
CT neck with contrast
If concern for foreign body with atypical presentation
CT chest or airway imaging per local protocol
Ultrasound (or US)
Ultrasound considerations
Limited role in routine croup
Adjunct only
If concern for epiglottitis
Airway ultrasound expertise-dependent
If concern for retropharyngeal abscess
Soft tissue neck ultrasound as adjunct
Disposition
Discharge criteria
Safe discharge features
No stridor at rest
Minimal work of breathing
Normal or improving hydration
Tolerating oral intake
Caregiver reliability
Return precautions understood
Observation completed after nebulized epinephrine
No recurrence of stridor at rest
Admission criteria
Inpatient level of care triggers
Persistent stridor at rest after therapy
Recurrent need for nebulized epinephrine
Hypoxemia requiring oxygen
Ongoing supplemental oxygen
Dehydration requiring IV fluids
Inability to maintain oral intake
High-risk comorbidity
Airway anomaly
Immunocompromise
ICU and transfer criteria
Critical care triggers
Impending respiratory failure
Fatigue
Hypercapnia concern
Need for repeated nebulized epinephrine at short intervals
Persistent severe symptoms
Concern for bacterial tracheitis or epiglottitis
Airway-protective planning
Limited local airway capability
Early transfer to pediatric-capable center
Treatment
Supportive care
Supportive measures
Calm environment
Parent presence
Oxygen when needed
Blow-by oxygen
Nasal cannula if tolerated
Oral hydration when mild
Small frequent fluids
Antipyretics for comfort
Acetaminophen weight-based per local formulary
Ibuprofen weight-based per local formulary
Corticosteroids
Systemic corticosteroids for all severities
Dexamethasone PO or IM 0.6 mg/kg once
Maximum 10 mg
Onset within several hours
Reduced return visits and admission risk
Dexamethasone lower-dose options
0.15 mg/kg once
0.3 mg/kg once
Budesonide nebulized alternative when oral not possible
2 mg nebulized once
Similar efficacy to dexamethasone in many studies
Evidence level framing
High-quality evidence supports corticosteroids improving symptoms and reducing admissions
ACEP Level A style evidence equivalent support for steroid use in croup pathways
Nebulized epinephrine
Nebulized epinephrine for moderate to severe croup
Racemic epinephrine 2.25% nebulized 0.05 mL/kg
Maximum 0.5 mL
Dilution to 3 mL with normal saline
Clinical effect within minutes
L-epinephrine 1 mg/mL nebulized 0.5 mL/kg
Maximum 5 mL
Comparable efficacy to racemic formulations
Observation after dose
Minimum 2-3 hours after last dose
Recurrence monitoring as effect wanes
Repeat dosing logic
If persistent severe symptoms at 10-20 minutes, repeat nebulized epinephrine
If repeated doses required, admission or ICU consideration
Escalation therapies and airway management
Escalation options
Heliox for refractory moderate to severe symptoms
Bridge while steroids take effect
Most effective with high oxygen saturation and minimal oxygen requirement
Noninvasive ventilation considerations
Not routine
Specialist-guided in monitored setting
Intubation indications
Exhaustion
Persistent hypoxemia or hypercapnia concern
Decreasing level of consciousness
Intubation technique pearls
Smaller endotracheal tube than age-predicted
Experienced operator
Prepare for difficult airway and rapid deterioration
Therapies to avoid or limit
Low-value or harmful interventions
Routine antibiotics
Viral etiology typical
Routine beta-agonists
Upper airway obstruction primary issue
Routine humidified mist therapy
Limited evidence for meaningful benefit in ED setting
Sedation without airway plan
Increased obstruction risk
Coexisting bacterial disease pathway
If bacterial tracheitis suspected
Broad-spectrum IV antibiotics
Local guideline regimen
Staphylococcus aureus coverage
Early airway consultation
High intubation frequency
Admission to ICU
Airway toileting needs
Special Populations
Pregnancy
Pregnancy considerations
Rare adult croup presentation
Alternative diagnosis prioritization
Medication safety
Dexamethasone acceptable when clinically indicated
Nebulized epinephrine with maternal monitoring
Fetal considerations
Maternal hypoxemia avoidance
Obstetric consultation if severe illness
Geriatric
Older adult considerations
Croup uncommon
Broader differential emphasis
Cardiac risk with epinephrine
Ischemia and arrhythmia monitoring
Medication interactions
Beta-blocker use and epinephrine response variability
Pediatrics
Pediatric-specific considerations
Peak age 6 months to 3 years
Highest hospitalization risk in younger children
Weight-based dosing accuracy
kg-based dosing confirmation
Small airway physiology
Rapid deterioration potential
Admission threshold lower in infants
Age < 6 months
Comorbid airway anomaly
Background
Epidemiology
Epidemiology overview
Common pediatric cause of acute upper airway obstruction
Seasonal peaks fall and early winter
Typical age range
6 months to 6 years
Viral causes
Parainfluenza most common
Influenza and RSV possible
Pathophysiology
Mechanism of disease
Laryngeal and tracheal mucosal inflammation
Subglottic edema
Airflow limitation dynamics
Increased resistance with small radius reduction
Stridor mechanism
Turbulent inspiratory airflow across narrowed subglottis
Therapeutic Considerations
Rationale for core therapies
Corticosteroids
Reduced mucosal edema
Reduced symptom duration
Nebulized epinephrine
Alpha-adrenergic vasoconstriction reduces edema
Rapid but transient benefit
Observation requirement after epinephrine
Effect wanes within hours
Rebound symptoms possible
Evidence framing
Steroids supported by strong evidence across severities
Epinephrine supported for short-term improvement in moderate to severe disease
Patient Discharge Instructions
copy discharge instructions
Discharge instructions for croup
Diagnosis explanation
Viral swelling of the upper airway
Barky cough and noisy breathing can worsen at night
Home care
Keep child calm
Encourage fluids
Antipyretics for fever or discomfort per label instructions
Expected course
Often improves over 2-3 days
Cough may last up to 1 week
Return to ED immediately
Stridor at rest
Increased work of breathing
Blue lips or face
Drooling or trouble swallowing
Very sleepy or hard to wake
Poor drinking or signs of dehydration
Symptoms worsening after initial improvement
Follow-up
Primary care follow-up within 1-2 days if not improving
Earlier follow-up for infants or recurrent episodes
References
Clinical guidelines and evidence
Core references
American Academy of Pediatrics clinical resources on croup and upper airway obstruction
Steroid therapy supported across severities
Canadian Paediatric Society practice point on acute management of croup
Dexamethasone as first-line therapy
Cochrane reviews on glucocorticoids for croup
Reduced symptom scores and admissions
Cochrane reviews on nebulized epinephrine for croup
Short-term improvement in moderate to severe disease
Emergency medicine clinical pathways for croup severity-based management
Observation after nebulized epinephrine 2-3 hours
Evidence level notation mapping
ACEP Level A strong evidence
ACEP Level B moderate evidence
ACEP Level C consensus or limited evidence
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.