PALS - Pediatric Advanced Life Support Managing Respiratory Emergencies Questions and Answers — Questions and Answers
Question 1: A 9-month-old infant presents with tachypnea, prominent nasal flaring, and audible wheezing. The parents report a recent upper respiratory infection. The infant is irritable but consolable. Oxygen saturation is 93% on room air. According to PALS guidelines, which of the following is the most appropriate initial management step for suspected bronchiolitis?
- Administer a nebulized short-acting beta-agonist (albuterol).
- Perform nasal suctioning and provide supplemental oxygen. (Correct answer)
- Immediately administer intravenous corticosteroids.
- Obtain a chest X-ray to confirm the diagnosis.
Correct answer: Perform nasal suctioning and provide supplemental oxygen.
The management of bronchiolitis is primarily supportive. The initial priorities are to clear the airway of secretions, which is often the main cause of distress in infants who are obligate nose breathers, and to correct hypoxemia. Nasal suctioning followed by supplemental oxygen is the cornerstone of initial treatment. Bronchodilators and corticosteroids are not routinely recommended for bronchiolitis.
Question 2: Which of the following clinical signs is considered a hallmark of upper airway obstruction in a pediatric patient?
- Expiratory wheezing
- Productive cough
- Inspiratory stridor (Correct answer)
- Rales and crackles
Correct answer: Inspiratory stridor
Inspiratory stridor, a high-pitched sound heard during inspiration, is the characteristic sign of upper airway obstruction. It indicates turbulent airflow through a narrowed portion of the airway above the thoracic inlet, such as the larynx or trachea. Expiratory wheezing is typical of lower airway obstruction, while rales and crackles suggest fluid in the alveoli (lung tissue disease).
Question 3: A 4-year-old child in the pediatric intensive care unit develops sudden, severe bradycardia. According to the PALS algorithm, what is the most common underlying cause of bradycardia in children?
- Primary cardiac conduction defect
- Hypoglycemia
- Hypoxia (Correct answer)
- Hyperthermia
Correct answer: Hypoxia
Unlike adults, bradycardia in children is most often a secondary event, not a primary cardiac problem. The most common cause of pediatric bradycardia is hypoxia resulting from respiratory distress or failure. Therefore, the initial management steps in the PALS bradycardia algorithm focus on assessing and supporting the airway and breathing to ensure adequate oxygenation.
Question 4: A 7-year-old known asthmatic is brought to the emergency department with severe respiratory distress, audible wheezing, and accessory muscle use. Oxygen saturation is 89% on room air. What is the most important initial pharmacologic treatment for this child's condition?
- Intravenous magnesium sulfate
- Inhaled short-acting beta-agonist (albuterol) and systemic corticosteroids (Correct answer)
- Subcutaneous epinephrine
- Inhaled ipratropium bromide alone
Correct answer: Inhaled short-acting beta-agonist (albuterol) and systemic corticosteroids
For a severe asthma exacerbation, the cornerstone of initial treatment is the rapid administration of a short-acting beta-agonist (SABA) like albuterol to cause bronchodilation, along with systemic corticosteroids to reduce airway inflammation. Oxygen should also be provided to correct hypoxemia. While other medications like ipratropium and magnesium sulfate are used, SABA and corticosteroids are the priority initial therapies.
Question 5: You are performing bag-mask ventilation on a 6-month-old infant who has a pulse but is in respiratory arrest. What is the correct ventilation rate according to the most recent PALS guidelines?
- 1 breath every 6 to 8 seconds (8-10 breaths/min)
- 1 breath every 5 to 6 seconds (10-12 breaths/min)
- As fast as possible to raise oxygen saturation
- 1 breath every 2 to 3 seconds (20-30 breaths/min) (Correct answer)
Correct answer: 1 breath every 2 to 3 seconds (20-30 breaths/min)
For rescue breathing in an infant or child with a pulse but inadequate respiratory effort, the correct rate is 1 breath every 2 to 3 seconds, which equals 20-30 breaths per minute. This rate ensures adequate ventilation without compromising hemodynamic stability by causing excessive intrathoracic pressure.
Question 6: Which of the following findings best differentiates respiratory failure from respiratory distress in a child?
- Presence of tachypnea and retractions
- Altered mental status and cyanosis despite oxygen (Correct answer)
- Oxygen saturation of 95% on room air
- Audible wheezing or stridor
Correct answer: Altered mental status and cyanosis despite oxygen
Respiratory distress is a state of increased work of breathing where the body is still compensating. Respiratory failure occurs when these compensatory mechanisms fail, leading to inadequate oxygenation and/or ventilation. Hallmarks of respiratory failure include a significant change in mental status (lethargy, unresponsiveness), poor air movement, and persistent cyanosis despite supplemental oxygen, often accompanied by a slowing respiratory rate or bradycardia.
PALS - Pediatric Advanced Life Support Managing Respiratory Emergencies Questions and Answers
A 9-month-old infant presents with tachypnea, prominent nasal flaring, and audible wheezing.
The parents report a recent upper respiratory infection.
The infant is irritable but consolable.
Oxygen saturation is 93% on room air.
According to PALS guidelines, which of the following is the most appropriate initial management step for suspected bronchiolitis?