Croup

Pediatric • Respiratory • Infectious Disease

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Overview

Croup (laryngotracheobronchitis) is a common childhood respiratory condition characterized by a barking cough, stridor, and hoarseness due to inflammation and edema in the subglottic area of the larynx. It primarily affects children between 6 months and 3 years of age, with peak incidence at 2 years.

Epidemiology: Croup accounts for approximately 15% of respiratory tract infections in children and is the most common cause of acute upper airway obstruction in young children, with seasonal peaks in fall and winter.

Causes & Pathophysiology

Viral Etiology:

Pathophysiology:

Viral infection of upper respiratory tract → inflammation and edema of larynx, trachea, and bronchi → particularly affects subglottic area (narrowest part of pediatric airway) → airway narrowing → turbulent airflow → characteristic barking cough and stridor.

Anatomical Considerations:

Types of Croup:

Type Characteristics Severity
Viral Croup Most common, gradual onset, self-limited Mild to moderate
Spasmodic Croup Sudden onset at night, no fever, recurrent Mild to moderate
Bacterial Tracheitis High fever, toxic appearance, purulent secretions Severe

Symptoms & Presentation

Classic Triad:

Other Symptoms:

Clinical Severity Assessment (Westley Croup Score):

Parameter 0 points 1 point 2 points 3 points 5 points
Stridor None With agitation At rest - -
Retractions None Mild Moderate Severe -
Air Entry Normal Mild decrease Moderate decrease Severe decrease -
Cyanosis None With agitation At rest - -
Level of Consciousness Normal Restless Lethargic - -

Score Interpretation: Mild (0-2), Moderate (3-5), Severe (6-11), Impending Respiratory Failure (≥12)

Risk Factors

Demographic Factors:

Medical Risk Factors:

Environmental Factors:

Diagnosis & Investigations

Clinical Diagnosis:

Primarily based on characteristic history and physical examination. Laboratory and imaging studies are rarely needed.

Physical Examination:

Ancillary Tests (when indicated):

Test Purpose Findings
Neck X-ray (AP view) Rule out other diagnoses Steeple sign (subglottic narrowing)
Pulse Oximetry Assess oxygenation Usually normal until severe disease
Viral Testing Identify specific virus Not routinely needed
Blood Gas Assess ventilation Only in severe respiratory distress

Differential Diagnosis:

Management & Treatment

Home Management (Mild Cases):

Medical Treatment:

Treatment Indication Dosage/Administration
Dexamethasone All cases of croup 0.15-0.6 mg/kg PO/IM (single dose)
Nebulized Epinephrine Moderate to severe croup Racemic: 0.5 mL of 2.25% or L-epinephrine: 5 mL of 1:1000
Oxygen Hypoxemia (SpO2 <92%) Humidified oxygen via face mask or nasal cannula
Heliox Severe croup not responding to epinephrine 70:30 helium-oxygen mixture

Treatment Algorithm:

  1. Mild croup (score 0-2): Single dose dexamethasone, home care
  2. Moderate croup (score 3-5): Dexamethasone, consider nebulized epinephrine, observe 2-4 hours
  3. Severe croup (score 6-11): Dexamethasone, nebulized epinephrine, oxygen, hospital admission
  4. Impending respiratory failure (score ≥12): ICU admission, consider intubation
Important: Do not examine the throat in a child with suspected epiglottitis, as this may cause complete airway obstruction. Differentiate croup from epiglottitis based on clinical presentation.

Ayurvedic Treatment

Herbal Support (under medical supervision):

Supportive Measures:

Note: Ayurvedic treatments should complement, not replace, conventional medical care for croup. Severe croup requires immediate medical attention.

Diet, Lifestyle & Self-care

Nutritional Support:

Home Care Measures:

When to Use Emergency Measures:

Prognosis

Most cases of viral croup are self-limited and resolve completely within 3-7 days. With appropriate treatment, the prognosis is excellent, and serious complications are rare.

Typical Course:

Recurrence:

Approximately 5% of children experience recurrent croup episodes. These children may have underlying airway hyperreactivity or anatomical variations.

Potential Complications (Rare):

When to Seek Medical Care

Seek immediate medical attention if your child has:
  • Difficulty breathing (rapid breathing, retractions)
  • Stridor at rest (not just when crying)
  • Pale or bluish skin color
  • Drooling or difficulty swallowing
  • Severe agitation or lethargy
  • Inability to speak or cry
  • Signs of dehydration (dry mouth, no tears, decreased urination)
  • High fever (>39°C/102.2°F)
  • Symptoms not improving with home care

Prevention & Screening

Preventive Measures:

No Specific Screening:

Routine screening for croup is not recommended as it is an acute condition. Prevention focuses on reducing viral transmission and maintaining overall respiratory health.

Parent Education: