PALS RED CROSS FINAL EXAM MASTERY
CORRECT VERIFIED ANSWERS and
DETAILED CORRECT ANSWERS WITH
RATIONALES GRADE A+ | 100% PASS
GUARANTEE | INSTANT DOWNLOAD
1. A 6-month-old infant is brought to the emergency
department unresponsive and apneic. The resuscitation team
initiates high-quality CPR. According to Red Cross PALS
guidelines, what is the correct compression-to-breath ratio for
this infant when two healthcare providers are performing
resuscitation?
A. 30:2
B. 15:2
C. 15:2 with compressions delivered at a rate of 100-120 per
minute and depth of approximately one-third the anterior-
posterior chest diameter
D. 30:2 with asynchronous ventilations
Rationale: For infants and children, two-rescuer CPR
requires a 15:2 compression-to-ventilation ratio to minimize
interruptions in chest compressions while providing adequate
ventilation; compressions must be deep enough (1/3 AP
diameter) and fast enough to generate perfusion.
2. During resuscitation of a pediatric patient in pulseless
ventricular tachycardia, the team has administered three
shocks and epinephrine. The rhythm remains refractory. Which
medication should be considered next according to the PALS
tachycardia algorithm?
A. Adenosine
,B. Magnesium sulfate
C. Amiodarone or procainamide as an antiarrhythmic infusion
to treat refractory VF/pVT after epinephrine and defibrillation
have failed
D. Atropine
Rationale: Refractory VF/pVT indicates electrical
instability unresponsive to standard ACLS/PALS measures;
amiodarone or procainamide are recommended
antiarrhythmics to stabilize myocardial membrane potential
and facilitate successful defibrillation.
3. A 4-year-old child presents with severe respiratory distress,
stridor at rest, drooling, and tripod positioning. The team
suspects epiglottitis. What is the most critical immediate action
regarding airway management?
A. Attempt direct laryngoscopy immediately to visualize
swelling
B. Administer nebulized racemic epinephrine and observe
C. Avoid any agitation or invasive airway manipulation until in
a controlled setting with expert personnel ready for definitive
surgical airway if needed
D. Insert a nasopharyngeal airway to bypass upper obstruction
Rationale: Epiglottitis involves friable supraglottic edema;
agitation or blind instrumentation can precipitate complete
airway collapse; maintaining spontaneous ventilation and
securing airway in OR/ICU with anesthesia/ENT backup
prevents catastrophic loss of airway.
4. When assessing a pediatric patient with suspected shock,
capillary refill time >3 seconds, weak peripheral pulses, and
altered mental status indicate which stage of shock requiring
immediate intervention?
,A. Compensated shock with maintained blood pressure
B. Early distributive shock with warm extremities
C. Decompensated shock where compensatory mechanisms are
failing, indicating imminent cardiovascular collapse and need
for rapid fluid bolus and vasoactive support
D. Irreversible shock with multiorgan failure
Rationale: Altered mental status and prolonged capillary
refill signify inadequate end-organ perfusion despite
compensation; this transition from compensated to
decompensated shock demands aggressive volume
resuscitation and early vasopressors before hypotension
develops.
5. A 2-year-old arrives in supraventricular tachycardia (SVT)
with a heart rate of 240 bpm, poor perfusion, and lethargy.
After establishing IV access and attempting vagal maneuvers
without success, what is the next appropriate step?
A. Synchronized cardioversion at 0.5-1 J/kg
B. Amiodarone 5 mg/kg IV push
C. Adenosine 0.1 mg/kg rapid IV push followed by immediate
saline flush, repeating at 0.2 mg/kg if unsuccessful, while
preparing for synchronized cardioversion if unstable
D. Procainamide 15 mg/kg over 30 minutes
Rationale: Adenosine transiently blocks AV nodal
conduction terminating re-entrant SVT; rapid administration
with flush ensures drug reaches heart before metabolism;
synchronized cardioversion reserved for hemodynamically
unstable patients unresponsive to adenosine or when IV access
delayed.
, 6. During pediatric CPR, end-tidal CO2 (ETCO2) monitoring
shows values consistently <10 mmHg despite high-quality
compressions. This finding most likely indicates:
A. Effective chest compressions generating adequate cardiac
output
B. Return of spontaneous circulation
C. Inadequate chest compression quality, low cardiac output, or
misplaced advanced airway requiring immediate reassessment
of CPR mechanics and tube placement
D. Hyperventilation causing excessive CO2 elimination
Rationale: ETCO2 correlates with pulmonary blood flow
during CPR; persistently low values suggest insufficient cardiac
output from poor compressions, severe metabolic acidosis, or
esophageal intubation rather than effective resuscitation.
7. A 7-year-old with known long QT syndrome collapses during
swimming and presents in torsades de pointes. After initiating
CPR and defibrillation, which medication specifically targets
the underlying electrophysiological abnormality?
A. Amiodarone
B. Lidocaine
C. Magnesium sulfate 25-50 mg/kg IV to stabilize cardiac
membranes and suppress early afterdepolarizations
characteristic of polymorphic VT associated with prolonged
repolarization
D. Epinephrine
Rationale: Magnesium is first-line for torsades regardless
of serum level because it reduces calcium influx and suppresses
triggered activity; amiodarone prolongs QT further and is
contraindicated; lidocaine may be adjunctive but MgSO4
addresses core mechanism.
CORRECT VERIFIED ANSWERS and
DETAILED CORRECT ANSWERS WITH
RATIONALES GRADE A+ | 100% PASS
GUARANTEE | INSTANT DOWNLOAD
1. A 6-month-old infant is brought to the emergency
department unresponsive and apneic. The resuscitation team
initiates high-quality CPR. According to Red Cross PALS
guidelines, what is the correct compression-to-breath ratio for
this infant when two healthcare providers are performing
resuscitation?
A. 30:2
B. 15:2
C. 15:2 with compressions delivered at a rate of 100-120 per
minute and depth of approximately one-third the anterior-
posterior chest diameter
D. 30:2 with asynchronous ventilations
Rationale: For infants and children, two-rescuer CPR
requires a 15:2 compression-to-ventilation ratio to minimize
interruptions in chest compressions while providing adequate
ventilation; compressions must be deep enough (1/3 AP
diameter) and fast enough to generate perfusion.
2. During resuscitation of a pediatric patient in pulseless
ventricular tachycardia, the team has administered three
shocks and epinephrine. The rhythm remains refractory. Which
medication should be considered next according to the PALS
tachycardia algorithm?
A. Adenosine
,B. Magnesium sulfate
C. Amiodarone or procainamide as an antiarrhythmic infusion
to treat refractory VF/pVT after epinephrine and defibrillation
have failed
D. Atropine
Rationale: Refractory VF/pVT indicates electrical
instability unresponsive to standard ACLS/PALS measures;
amiodarone or procainamide are recommended
antiarrhythmics to stabilize myocardial membrane potential
and facilitate successful defibrillation.
3. A 4-year-old child presents with severe respiratory distress,
stridor at rest, drooling, and tripod positioning. The team
suspects epiglottitis. What is the most critical immediate action
regarding airway management?
A. Attempt direct laryngoscopy immediately to visualize
swelling
B. Administer nebulized racemic epinephrine and observe
C. Avoid any agitation or invasive airway manipulation until in
a controlled setting with expert personnel ready for definitive
surgical airway if needed
D. Insert a nasopharyngeal airway to bypass upper obstruction
Rationale: Epiglottitis involves friable supraglottic edema;
agitation or blind instrumentation can precipitate complete
airway collapse; maintaining spontaneous ventilation and
securing airway in OR/ICU with anesthesia/ENT backup
prevents catastrophic loss of airway.
4. When assessing a pediatric patient with suspected shock,
capillary refill time >3 seconds, weak peripheral pulses, and
altered mental status indicate which stage of shock requiring
immediate intervention?
,A. Compensated shock with maintained blood pressure
B. Early distributive shock with warm extremities
C. Decompensated shock where compensatory mechanisms are
failing, indicating imminent cardiovascular collapse and need
for rapid fluid bolus and vasoactive support
D. Irreversible shock with multiorgan failure
Rationale: Altered mental status and prolonged capillary
refill signify inadequate end-organ perfusion despite
compensation; this transition from compensated to
decompensated shock demands aggressive volume
resuscitation and early vasopressors before hypotension
develops.
5. A 2-year-old arrives in supraventricular tachycardia (SVT)
with a heart rate of 240 bpm, poor perfusion, and lethargy.
After establishing IV access and attempting vagal maneuvers
without success, what is the next appropriate step?
A. Synchronized cardioversion at 0.5-1 J/kg
B. Amiodarone 5 mg/kg IV push
C. Adenosine 0.1 mg/kg rapid IV push followed by immediate
saline flush, repeating at 0.2 mg/kg if unsuccessful, while
preparing for synchronized cardioversion if unstable
D. Procainamide 15 mg/kg over 30 minutes
Rationale: Adenosine transiently blocks AV nodal
conduction terminating re-entrant SVT; rapid administration
with flush ensures drug reaches heart before metabolism;
synchronized cardioversion reserved for hemodynamically
unstable patients unresponsive to adenosine or when IV access
delayed.
, 6. During pediatric CPR, end-tidal CO2 (ETCO2) monitoring
shows values consistently <10 mmHg despite high-quality
compressions. This finding most likely indicates:
A. Effective chest compressions generating adequate cardiac
output
B. Return of spontaneous circulation
C. Inadequate chest compression quality, low cardiac output, or
misplaced advanced airway requiring immediate reassessment
of CPR mechanics and tube placement
D. Hyperventilation causing excessive CO2 elimination
Rationale: ETCO2 correlates with pulmonary blood flow
during CPR; persistently low values suggest insufficient cardiac
output from poor compressions, severe metabolic acidosis, or
esophageal intubation rather than effective resuscitation.
7. A 7-year-old with known long QT syndrome collapses during
swimming and presents in torsades de pointes. After initiating
CPR and defibrillation, which medication specifically targets
the underlying electrophysiological abnormality?
A. Amiodarone
B. Lidocaine
C. Magnesium sulfate 25-50 mg/kg IV to stabilize cardiac
membranes and suppress early afterdepolarizations
characteristic of polymorphic VT associated with prolonged
repolarization
D. Epinephrine
Rationale: Magnesium is first-line for torsades regardless
of serum level because it reduces calcium influx and suppresses
triggered activity; amiodarone prolongs QT further and is
contraindicated; lidocaine may be adjunctive but MgSO4
addresses core mechanism.
