AHA Pediatric Advanced Life Support (PALS) Certification Exam | Latest &
Newest Update | Comprehensive Study Guide, Practice Questions, Verified
Answers, Detailed Rationales, Pediatric Resuscitation Algorithms, ECG
Rhythm Recognition, Emergency Cardiovascular Care, Case-Based Scenarios
& Comprehensive Certification Exam Preparation PDF
Question 1
A patient in respiratory distress with a blood pressure of 70/50 mm Hg presents with the
following Lead II ECG rhythm. What is the appropriate next intervention?
A. Defibrillation
B. Amiodarone 150 mg IV
C. Adenosine 6 mg IV push
D. Synchronized cardioversion
Answer: D. Synchronized cardioversion
Rationale: The patient is hemodynamically unstable (hypotension, respiratory distress). For
a perfusing tachyarrhythmia that is causing instability, immediate synchronized
cardioversion is indicated to restore an organized rhythm. Defibrillation is for pulseless
VF/VT; antiarrhythmics or adenosine are not the first action in an unstable patient.
Question 2
A patient has a witnessed loss of consciousness. The Lead II ECG reveals this rhythm.
What is the appropriate next intervention?
,A. Defibrillation B.
Adenosine 6 mg IV push
C. Epinephrine 1 mg IV push
D. Synchronized cardioversion
Answer: A. Defibrillation
Rationale: A witnessed loss of consciousness with a shockable rhythm on the monitor
(ventricular fibrillation or pulseless ventricular tachycardia) requires immediate
unsynchronized defibrillation. Defibrillation is the priority to restore a perfusing rhythm.
Adenosine is for SVT with a narrow-complex tachycardia; epinephrine is given during
advanced cardiac life support but defibrillation is first for shockable arrest.
Question 3
What is the recommended energy dose for biphasic synchronized cardioversion of atrial
fibrillation? A. 50–75 J
B. 75–100 J
C. 120–200 J
D. 200–300 J
Answer: C. 120–200 J
Rationale: For atrial fibrillation, current guidelines recommend starting biphasic
synchronized cardioversion at 120–200 J (depending on device and manufacturer).
Lower energies (50–100 J) are more typical for narrow-complex SVT; higher energies may
be used if initial shocks fail.
Question 4
Which of the following is an acceptable method of selecting an appropriately sized
oropharyngeal airway (OPA)?
A. Estimate by using the size of the patient's thumb B.
Estimate by using the formula Weight (kg)/8 + 2
,C. Measure from the thyroid cartilage to the angle of the mandible
D. Measure from the corner of the mouth to the angle of the mandible
Answer: D. Measure from the corner of the mouth to the angle of the mandible
Rationale: Proper OPA size is chosen by measuring corner of mouth → angle of
mandible (or corner of mouth → earlobe). This ensures the airway is long enough to reach
the oropharynx without causing gagging or obstruction. Other methods listed are
inaccurate.
Question 1
Which is a contraindication to nitroglycerin administration in the management of acute coronary
syndromes?
A. Heart rate greater than 80/min
B. Right ventricular infarction and dysfunction
C. Phosphodiesterase inhibitor use more than 72 hours ago
D. Systolic blood pressure greater than 100 mm Hg
Answer: B. Right ventricular infarction and dysfunction
Rationale: Nitroglycerin is contraindicated in right ventricular infarction, because preload is
necessary to maintain cardiac output. Vasodilation reduces preload and can precipitate severe
hypotension and shock. Phosphodiesterase inhibitors (e.g., sildenafil) are a contraindication if
taken within 24–48 hours, not after 72 hours.
Question 2
What is the recommended initial intervention for managing hypotension in the immediate period
after return of spontaneous circulation (ROSC)?
A. Atropine bolus
B. Administration of IV or IO fluid bolus
C. Placement of a central line to monitor pulmonary wedge pressure
D. Phenylephrine hydrochloride titrated to keep systolic blood pressure >100 mm Hg
, Answer: B. Administration of IV or IO fluid bolus
Rationale: After ROSC, the first-line treatment for hypotension is IV or IO fluid bolus (e.g.,
normal saline or lactated Ringer’s) to optimize preload. Vasopressors like phenylephrine or
norepinephrine may be used if fluids fail. Atropine is used for bradycardia, not hypotension.
Question 3
Which is an appropriate and important intervention to perform for a patient who achieves ROSC
during an out-of-hospital resuscitation?
A. Initiate an antiarrhythmic infusion
B. Transport the patient to a facility capable of performing PCI
C. Replace any supraglottic airway with an endotracheal tube
D. Place a central venous catheter for hemodynamic monitoring
Answer: B. Transport the patient to a facility capable of performing PCI
Rationale: After ROSC, the highest priority is rapid transfer to a hospital capable of definitive
coronary reperfusion therapy (PCI), since coronary occlusion is a leading cause of cardiac
arrest. Airway optimization and hemodynamic monitoring are important but not prioritized over
reperfusion therapy.
PCI.
Question 1
What is the immediate danger of excessive ventilation during the post-cardiac arrest period for
patients who achieve ROSC?
A. Oxygen toxicity
B. Pulmonary hypertension
C. Decreased cerebral blood flow
D. Ventilation/perfusion mismatch
Newest Update | Comprehensive Study Guide, Practice Questions, Verified
Answers, Detailed Rationales, Pediatric Resuscitation Algorithms, ECG
Rhythm Recognition, Emergency Cardiovascular Care, Case-Based Scenarios
& Comprehensive Certification Exam Preparation PDF
Question 1
A patient in respiratory distress with a blood pressure of 70/50 mm Hg presents with the
following Lead II ECG rhythm. What is the appropriate next intervention?
A. Defibrillation
B. Amiodarone 150 mg IV
C. Adenosine 6 mg IV push
D. Synchronized cardioversion
Answer: D. Synchronized cardioversion
Rationale: The patient is hemodynamically unstable (hypotension, respiratory distress). For
a perfusing tachyarrhythmia that is causing instability, immediate synchronized
cardioversion is indicated to restore an organized rhythm. Defibrillation is for pulseless
VF/VT; antiarrhythmics or adenosine are not the first action in an unstable patient.
Question 2
A patient has a witnessed loss of consciousness. The Lead II ECG reveals this rhythm.
What is the appropriate next intervention?
,A. Defibrillation B.
Adenosine 6 mg IV push
C. Epinephrine 1 mg IV push
D. Synchronized cardioversion
Answer: A. Defibrillation
Rationale: A witnessed loss of consciousness with a shockable rhythm on the monitor
(ventricular fibrillation or pulseless ventricular tachycardia) requires immediate
unsynchronized defibrillation. Defibrillation is the priority to restore a perfusing rhythm.
Adenosine is for SVT with a narrow-complex tachycardia; epinephrine is given during
advanced cardiac life support but defibrillation is first for shockable arrest.
Question 3
What is the recommended energy dose for biphasic synchronized cardioversion of atrial
fibrillation? A. 50–75 J
B. 75–100 J
C. 120–200 J
D. 200–300 J
Answer: C. 120–200 J
Rationale: For atrial fibrillation, current guidelines recommend starting biphasic
synchronized cardioversion at 120–200 J (depending on device and manufacturer).
Lower energies (50–100 J) are more typical for narrow-complex SVT; higher energies may
be used if initial shocks fail.
Question 4
Which of the following is an acceptable method of selecting an appropriately sized
oropharyngeal airway (OPA)?
A. Estimate by using the size of the patient's thumb B.
Estimate by using the formula Weight (kg)/8 + 2
,C. Measure from the thyroid cartilage to the angle of the mandible
D. Measure from the corner of the mouth to the angle of the mandible
Answer: D. Measure from the corner of the mouth to the angle of the mandible
Rationale: Proper OPA size is chosen by measuring corner of mouth → angle of
mandible (or corner of mouth → earlobe). This ensures the airway is long enough to reach
the oropharynx without causing gagging or obstruction. Other methods listed are
inaccurate.
Question 1
Which is a contraindication to nitroglycerin administration in the management of acute coronary
syndromes?
A. Heart rate greater than 80/min
B. Right ventricular infarction and dysfunction
C. Phosphodiesterase inhibitor use more than 72 hours ago
D. Systolic blood pressure greater than 100 mm Hg
Answer: B. Right ventricular infarction and dysfunction
Rationale: Nitroglycerin is contraindicated in right ventricular infarction, because preload is
necessary to maintain cardiac output. Vasodilation reduces preload and can precipitate severe
hypotension and shock. Phosphodiesterase inhibitors (e.g., sildenafil) are a contraindication if
taken within 24–48 hours, not after 72 hours.
Question 2
What is the recommended initial intervention for managing hypotension in the immediate period
after return of spontaneous circulation (ROSC)?
A. Atropine bolus
B. Administration of IV or IO fluid bolus
C. Placement of a central line to monitor pulmonary wedge pressure
D. Phenylephrine hydrochloride titrated to keep systolic blood pressure >100 mm Hg
, Answer: B. Administration of IV or IO fluid bolus
Rationale: After ROSC, the first-line treatment for hypotension is IV or IO fluid bolus (e.g.,
normal saline or lactated Ringer’s) to optimize preload. Vasopressors like phenylephrine or
norepinephrine may be used if fluids fail. Atropine is used for bradycardia, not hypotension.
Question 3
Which is an appropriate and important intervention to perform for a patient who achieves ROSC
during an out-of-hospital resuscitation?
A. Initiate an antiarrhythmic infusion
B. Transport the patient to a facility capable of performing PCI
C. Replace any supraglottic airway with an endotracheal tube
D. Place a central venous catheter for hemodynamic monitoring
Answer: B. Transport the patient to a facility capable of performing PCI
Rationale: After ROSC, the highest priority is rapid transfer to a hospital capable of definitive
coronary reperfusion therapy (PCI), since coronary occlusion is a leading cause of cardiac
arrest. Airway optimization and hemodynamic monitoring are important but not prioritized over
reperfusion therapy.
PCI.
Question 1
What is the immediate danger of excessive ventilation during the post-cardiac arrest period for
patients who achieve ROSC?
A. Oxygen toxicity
B. Pulmonary hypertension
C. Decreased cerebral blood flow
D. Ventilation/perfusion mismatch
