Pediatric Advanced Life Support (PALS) Certification Exam
Version 3– Pediatric Emergency Care and Resuscitation
Updated and Latest Questions and Correct Answers with
Rationale
1. A 6-year-old child presents with a sudden onset of barking cough, inspiratory stridor at
rest, and significant retractions. What is the most appropriate initial pharmacological
intervention for this severe case of croup?
A. Nebulized racemic epinephrine
B. Albuterol nebulization
C. Oral Ibuprofen
D. Intravenous antibiotics
Ans: A
Rationale: In cases of severe croup characterized by stridor at rest and respiratory distress, nebulized
racemic epinephrine is the treatment of choice to rapidly reduce mucosal edema. This medication works
by stimulating alpha-adrenergic receptors to cause vasoconstriction in the subglottic area. While
corticosteroids like dexamethasone are also essential, they have a slower onset of action compared to
epinephrine. Monitoring the patient for at least two hours after administration is crucial to check for a
rebound effect as the medication wears off. The child should be kept as calm as possible because crying
can significantly worsen airway obstruction. High-flow oxygen should be provided if the child is hypoxic
or showing signs of respiratory failure. This intervention follows the standardized PALS algorithm for
upper airway obstruction management in pediatric patients.
,2. During the resuscitation of a child in cardiac arrest with a non-shockable rhythm, what is
the recommended timing for the first dose of epinephrine?
A. After administering two unsuccessful shocks
B. After 2 minutes of high-quality CPR
C. Only after the first rhythm check
D. As soon as vascular access is established
Ans: D
Rationale: For non-shockable rhythms such as asystole or pulseless electrical activity (PEA), the PALS
guidelines emphasize the early administration of epinephrine. Studies indicate that every minute of delay
in giving epinephrine is associated with a decrease in the probability of achieving Return of Spontaneous
Circulation (ROSC). Therefore, once intravenous (IV) or intraosseous (IO) access is obtained, the first
dose should be given immediately. Epinephrine acts as an alpha-1 agonist to increase coronary perfusion
pressure through peripheral vasoconstriction. CPR should continue without interruption except for brief
rhythm checks every two minutes. Subsequent doses of epinephrine are typically administered every 3 to
5 minutes during the resuscitation effort. Prompt medication delivery is a critical component of high-
quality advanced life support in the pediatric setting.
,3. A 10-year-old child is in hypovolemic shock due to severe dehydration. What is the
recommended initial volume of isotonic crystalloid bolus according to PALS guidelines?
A. 20 mL/kg
B. 10 mL/kg
C. 5 mL/kg
D. 50 mL/kg
Ans: A
Rationale: Hypovolemic shock is the most common cause of shock in children worldwide and requires
rapid fluid replacement. The standard recommended initial bolus for pediatric fluid resuscitation is 20
mL/kg of an isotonic crystalloid, such as Normal Saline or Lactated Ringer’s. This volume is designed to
restore intravascular volume and improve cardiac output in children with signs of poor perfusion. The
bolus should be delivered rapidly, often over 5 to 20 minutes, depending on the severity of the shock.
Clinicians must reassess the patient’s heart rate, blood pressure, and capillary refill after each bolus is
completed. Multiple boluses may be required if the child does not show adequate signs of clinical
improvement. Care must be taken to watch for signs of fluid overload, such as new-onset crackles or
hepatomegaly, especially in patients with underlying cardiac or renal disease.
, 4. In a child with supraventricular tachycardia (SVT) who is hemodynamically stable, which
initial pharmacological intervention is most appropriate?
A. Adenosine
B. Amiodarone
C. Epinephrine
D. Lidocaine
Ans: A
Rationale: Adenosine is the primary medication used for the chemical cardioversion of supraventricular
tachycardia in pediatric patients. It works by briefly blocking conduction through the atrioventricular
(AV) node, allowing the heart’s natural pacemaker to regain control. If the patient is hemodynamically
stable, vagal maneuvers may be attempted first, but adenosine is the first-line drug therapy. The initial
dose is 0.1 mg/kg (maximum 6 mg) given as a rapid IV push followed immediately by a saline flush. A
second dose of 0.2 mg/kg (maximum 12 mg) can be administered if the first dose is ineffective. Because
of its extremely short half-life, adenosine must be delivered as close to the heart as possible. Continuous
ECG monitoring is mandatory during administration to observe the brief period of asystole that often
occurs. This systematic approach ensures that rhythm conversion is achieved safely in a controlled
environment.
Version 3– Pediatric Emergency Care and Resuscitation
Updated and Latest Questions and Correct Answers with
Rationale
1. A 6-year-old child presents with a sudden onset of barking cough, inspiratory stridor at
rest, and significant retractions. What is the most appropriate initial pharmacological
intervention for this severe case of croup?
A. Nebulized racemic epinephrine
B. Albuterol nebulization
C. Oral Ibuprofen
D. Intravenous antibiotics
Ans: A
Rationale: In cases of severe croup characterized by stridor at rest and respiratory distress, nebulized
racemic epinephrine is the treatment of choice to rapidly reduce mucosal edema. This medication works
by stimulating alpha-adrenergic receptors to cause vasoconstriction in the subglottic area. While
corticosteroids like dexamethasone are also essential, they have a slower onset of action compared to
epinephrine. Monitoring the patient for at least two hours after administration is crucial to check for a
rebound effect as the medication wears off. The child should be kept as calm as possible because crying
can significantly worsen airway obstruction. High-flow oxygen should be provided if the child is hypoxic
or showing signs of respiratory failure. This intervention follows the standardized PALS algorithm for
upper airway obstruction management in pediatric patients.
,2. During the resuscitation of a child in cardiac arrest with a non-shockable rhythm, what is
the recommended timing for the first dose of epinephrine?
A. After administering two unsuccessful shocks
B. After 2 minutes of high-quality CPR
C. Only after the first rhythm check
D. As soon as vascular access is established
Ans: D
Rationale: For non-shockable rhythms such as asystole or pulseless electrical activity (PEA), the PALS
guidelines emphasize the early administration of epinephrine. Studies indicate that every minute of delay
in giving epinephrine is associated with a decrease in the probability of achieving Return of Spontaneous
Circulation (ROSC). Therefore, once intravenous (IV) or intraosseous (IO) access is obtained, the first
dose should be given immediately. Epinephrine acts as an alpha-1 agonist to increase coronary perfusion
pressure through peripheral vasoconstriction. CPR should continue without interruption except for brief
rhythm checks every two minutes. Subsequent doses of epinephrine are typically administered every 3 to
5 minutes during the resuscitation effort. Prompt medication delivery is a critical component of high-
quality advanced life support in the pediatric setting.
,3. A 10-year-old child is in hypovolemic shock due to severe dehydration. What is the
recommended initial volume of isotonic crystalloid bolus according to PALS guidelines?
A. 20 mL/kg
B. 10 mL/kg
C. 5 mL/kg
D. 50 mL/kg
Ans: A
Rationale: Hypovolemic shock is the most common cause of shock in children worldwide and requires
rapid fluid replacement. The standard recommended initial bolus for pediatric fluid resuscitation is 20
mL/kg of an isotonic crystalloid, such as Normal Saline or Lactated Ringer’s. This volume is designed to
restore intravascular volume and improve cardiac output in children with signs of poor perfusion. The
bolus should be delivered rapidly, often over 5 to 20 minutes, depending on the severity of the shock.
Clinicians must reassess the patient’s heart rate, blood pressure, and capillary refill after each bolus is
completed. Multiple boluses may be required if the child does not show adequate signs of clinical
improvement. Care must be taken to watch for signs of fluid overload, such as new-onset crackles or
hepatomegaly, especially in patients with underlying cardiac or renal disease.
, 4. In a child with supraventricular tachycardia (SVT) who is hemodynamically stable, which
initial pharmacological intervention is most appropriate?
A. Adenosine
B. Amiodarone
C. Epinephrine
D. Lidocaine
Ans: A
Rationale: Adenosine is the primary medication used for the chemical cardioversion of supraventricular
tachycardia in pediatric patients. It works by briefly blocking conduction through the atrioventricular
(AV) node, allowing the heart’s natural pacemaker to regain control. If the patient is hemodynamically
stable, vagal maneuvers may be attempted first, but adenosine is the first-line drug therapy. The initial
dose is 0.1 mg/kg (maximum 6 mg) given as a rapid IV push followed immediately by a saline flush. A
second dose of 0.2 mg/kg (maximum 12 mg) can be administered if the first dose is ineffective. Because
of its extremely short half-life, adenosine must be delivered as close to the heart as possible. Continuous
ECG monitoring is mandatory during administration to observe the brief period of asystole that often
occurs. This systematic approach ensures that rhythm conversion is achieved safely in a controlled
environment.
