EMT: Pediatric Respiratory Emergencies
This lesson addresses pediatric respiratory emergencies, which are among the most common medical complaints in children and a leading cause of cardiac arrest in this population. EMTs must understand the unique anatomical and physiological differences in children that impact respiratory function and adapt their assessment and management strategies accordingly.
Anatomical and Physiological Differences in Pediatric Respiratory System
Smaller Airway Diameter: Children's airways are proportionally smaller and funnel-shaped, making them more susceptible to obstruction from swelling, secretions, or foreign bodies.
Larger Tongue Relative to Pharynx: Can easily obstruct the airway.
Softer Tracheal Cartilage: More prone to collapse.
Less Developed Intercostal Muscles: Rib cage is more compliant, leading to retractions as a sign of increased work of breathing rather than just muscle use.
Higher Metabolic Rate and Oxygen Demand: Children require more oxygen per kilogram of body weight than adults.
Limited Physiological Reserve: They can compensate for hypoxia for a time but then decompensate rapidly.
Obligatory Nose Breathers (Infants): Nasal obstruction can cause significant respiratory distress.
Spectrum of Pediatric Respiratory Distress to Failure
It is crucial to differentiate between respiratory distress, respiratory failure, and respiratory arrest, as interventions change dramatically.
Respiratory Distress: Increased work of breathing with adequate oxygenation and ventilation. The child is compensating.
Signs: Tachypnea, nasal flaring, retractions (intercostal, subcostal, supraclavicular), grunting, mild cyanosis (may be absent), irritability.
Respiratory Failure: Inadequate oxygenation and/or ventilation despite increased work of breathing. Compensation is failing.
Signs: Marked retractions, diminished breath sounds, severe pallor or cyanosis, decreased level of consciousness, bradycardia, poor muscle tone.
Respiratory Arrest: Cessation of breathing.
Signs: Apnea, unresponsiveness, severe cyanosis, bradycardia or asystole.
Common Pediatric Respiratory Emergencies
Croup (Laryngotracheobronchitis): Viral infection causing upper airway swelling.
Presentation: "Seal-bark" cough, stridor, hoarseness, typically worse at night.
Management: Humidified oxygen, comfort measures, nebulized epinephrine (ALS).
Epiglottitis: Bacterial infection of the epiglottis (less common due to Hib vaccine).
Presentation: Sudden onset high fever, sore throat, drooling, difficulty swallowing, tripod position, muffled voice, severe respiratory distress.
Management: MAINTAIN AIRWAY, do NOT visualize throat if epiglottitis is suspected, minimize agitation, high-flow oxygen, rapid transport.
Bronchiolitis: Viral infection (often RSV) causing inflammation of small airways.
Presentation: Wheezing, crackles, tachypnea, retractions, cough, often in infants <2 years old.
Management: Suctioning, humidified oxygen, bronchodilators (per protocol).
Asthma: Chronic inflammatory airway disease.
Presentation: Wheezing, shortness of breath, cough, chest tightness.
Management: Supplemental oxygen, bronchodilators (e.g., albuterol via nebulizer or MDI).
Foreign Body Airway Obstruction (FBAO): Common in toddlers.
Presentation: Sudden onset of coughing, gagging, stridor, or complete airway obstruction.
Management: Age-appropriate maneuvers (back blows/chest thrusts for infants, abdominal thrusts for conscious children), basic life support if unconscious.
Prehospital Management Principles
Maintain Airway: Open airway (head-tilt chin-lift or jaw thrust), clear secretions.
Support Breathing: Administer oxygen to maintain SpO2 >94%. Assist ventilations with BVM if inadequate.
Position of Comfort: Allow child to remain in position that eases breathing.
Minimize Agitation: Keep the child calm. Parental presence is often helpful.
Monitor Vital Signs: Especially respiratory rate, heart rate, and SpO2.
Rapid Transport: To an appropriate medical facility.
Critical Thinking Questions
You are called to a 10-month-old infant presenting with a "seal-bark" cough and stridor. What is the most likely diagnosis, and what are your immediate management priorities in the prehospital setting?
A 4-year-old child presents with sudden onset of high fever, drooling, and is sitting in a tripod position. What critical airway emergency should you be highly suspicious of, and what is the single most important intervention you should AVOID doing?
Explain why children in respiratory distress can rapidly progress to respiratory failure and cardiac arrest.
Differentiate between the breath sounds associated with upper airway obstruction versus lower airway obstruction in pediatric patients.
What specific considerations would you take into account when administering oxygen to an infant in respiratory distress, compared to an adult?