Stridor in a 1-Year-Old Child: Definition, Diagnosis, and Treatment

Definition of Stridor

• Inspiratory stridor - obstruction at or above the vocal folds (e.g., foreign body, epiglottitis, croup)
• Expiratory stridor (wheeze) - obstruction of the lower respiratory tract (asthma, tracheobronchitis)
• Biphasic stridor - obstruction or disease of the tracheobronchial airway or distal lungs

• Bailey and Love's Short Practice of Surgery, 28th Ed.

Clinical Context: Sudden-Onset Stridor in a 1-Year-Old

Differential Diagnosis of Sudden-Onset Stridor in a 1-Year-Old

• Bailey and Love's, K.J. Lee's Essential Otolaryngology, Rosen's Emergency Medicine

Foreign Body Aspiration: The Most Likely Diagnosis

Why This Age?

• Peak incidence is in children under 3 years
• FBA is the most common cause of accidental death in children under 1 year
• Children explore objects orally; peanuts, grapes, small toys, coins, and button batteries are common culprits
• Right main bronchus is involved in ~60% of cases (wider diameter, more vertical orientation)

Classic Presentation ("Penetration Syndrome")

• Sudden, witnessed or unwitnessed choking/gagging while eating or playing
• Initial episode of coughing, gagging, sputtering that may temporarily subside as foreign body moves past the vocal cords
• Followed by persistent stridor, wheezing, respiratory distress
• In >63% of pediatric FBA cases: sudden onset of choking/intractable cough with wheezing and respiratory distress

• Rosen's Emergency Medicine, K.J. Lee's Essential Otolaryngology

Diagnosis

1. History

• Was the child eating or playing with small objects?
• Was choking witnessed?
• Was there a sudden onset after a symptom-free period?
• Ask about timing: symptoms correlating with a specific event strongly suggest FBA even if no object was seen

2. Physical Examination

• Observe the child at rest first - do NOT immediately upset the child
• Assess for: respiratory distress, cyanosis, oxygen saturation, drooling, posture
• Auscultate for unilateral wheeze, decreased breath sounds on one side
• WARNING: If the child is cyanosed, severely distressed, or drooling - secure the airway first; do NOT attempt to examine the throat or lay the child flat (risk of complete obstruction and respiratory arrest)

3. Investigations

• Radiopaque foreign body visible in <25% of cases (most objects are radiolucent)
• Indirect signs to look for:
  • Unilateral hyperinflation (air trapping distal to a ball-valve obstruction)
  • Mediastinal shift away from the obstructed side
  • Elevated contralateral hemidiaphragm
  • Post-obstructive atelectasis/collapse (if chronic)
  • Pneumomediastinum or pneumothorax

Lateral X-ray showing an aspirated coin in the tracheal air column - Rosen's Emergency Medicine

• More sensitive than plain X-ray
• CT virtual bronchoscopy has ~98% positive predictive value for tracheobronchial foreign bodies
• Risk of sending an unstable child to the CT scanner - only if the child is sufficiently stable
• MRI useful for radiolucent objects with high fat content (nuts)

• Rigid bronchoscopy under general anesthesia is both diagnostic AND therapeutic
• A strong history alone may prompt bronchoscopy even if X-ray is normal
• Flexible bronchoscopy may be used diagnostically first, then rigid bronchoscopy for removal

• K.J. Lee's Essential Otolaryngology; Rosen's Emergency Medicine

Treatment

Immediate/Emergency Management (Based on Severity)

If the Child is in Respiratory Arrest or Critical Obstruction:

1. 5 back blows - held head-down, firm blows between shoulder blades
2. 5 chest thrusts - two fingers on the lower sternum
3. Alternate back blows and chest thrusts; do NOT use abdominal thrusts (Heimlich) in infants under 1 year
4. If unconscious: begin chest compressions (CPR), visualize oropharynx between cycles - remove foreign body only if visible
5. Direct/video laryngoscopy + Magill forceps removal if object visualized
6. Never perform blind finger sweeps - this pushes the object deeper

• Emergency intubation - can push a tracheal foreign body into right mainstem bronchus (then withdraw tube above carina to ventilate left lung)
• Needle cricothyrotomy if intubation fails due to fixed proximal obstruction

If the Child is Stable (Partial Obstruction, Maintaining Oxygen):

1. Keep child calm and sitting upright (position of comfort)
2. Supplemental oxygen via face mask
3. Do NOT attempt any oropharyngeal examination that might upset the child and precipitate complete obstruction
4. Establish IV access
5. Alert ENT (Otolaryngology), Anesthesia, and prepare for the operating room
6. Urgent rigid bronchoscopy under general anesthesia with spontaneous ventilation
   • Sharp objects are retrieved into the bronchoscope to minimize mucosal trauma
   • Rarely, tracheotomy is required for very large or impacted foreign bodies

Post-Procedure Care

• Monitor for post-obstructive pulmonary edema, mucosal trauma, pneumothorax
• If object was present >2 weeks: treat for secondary infection/bronchiectasis
• Parental counseling and safety education to prevent recurrence

Summary Algorithm for a 1-Year-Old with Sudden Stridor

Sudden stridor in 1-year-old
         |
Is the child cyanosed/in arrest?
         |
    YES --> Back blows + chest thrusts --> Laryngoscopy + Magill forceps
            If fails: Intubate / Needle cricothyrotomy
            Emergency bronchoscopy
         |
    NO  --> Keep calm, O2, upright position
            CXR (AP + Lateral + expiratory/decubitus)
            Consider CT if stable and CXR inconclusive
            Urgent ENT consult
            Rigid bronchoscopy (diagnostic + therapeutic) under GA

Key Points to Remember

1. Stridor = noisy breathing from partial airway obstruction - classify as inspiratory, expiratory, or biphasic to localize the level
2. Sudden-onset stridor in a 1-year-old = foreign body aspiration until proven otherwise
3. Most foreign bodies are radiolucent - a normal CXR does not rule out FBA; a strong history mandates bronchoscopy
4. Bronchoscopy is the gold standard for both diagnosis and treatment
5. In infants: back blows + chest thrusts (NOT Heimlich); never perform blind finger sweeps
6. Always be prepared for complete airway obstruction - have resuscitation equipment at hand before examining