Advanced Cardiac Life Support (ACLS) Test Questions: A Comprehensive Study Guide
Advanced Cardiac Life Support (ACLS) is a critical skill set for healthcare professionals who manage patients with life‑threatening cardiac emergencies. Day to day, below is a detailed compilation of common ACLS test questions, organized by topic, along with concise explanations to reinforce learning. Mastery of ACLS concepts is typically assessed through a combination of multiple‑choice questions (MCQs), scenario‑based prompts, and practical skill evaluations. This guide serves both as a study aid and a refresher for clinicians preparing for certification exams.
Introduction
ACLS tests examine three core domains:
- Cardiac arrest algorithms – recognition, response, and advanced interventions.
- Arrhythmia management – identification, pharmacology, and defibrillation.
- Clinical decision‑making – interpreting rhythm strips, responding to reversible causes, and performing post‑resuscitation care.
A solid grasp of these areas ensures that practitioners can deliver timely, evidence‑based care during cardiac emergencies.
1. Cardiac Arrest Algorithms
1.1. Basic Recognition and Initial Response
Question 1
A patient is found unresponsive, pulseless, and apneic. Which of the following is the first action a responder should take?
A) Administer 1 mg epinephrine IM
B) Start high‑rate CPR
C) Call for advanced cardiac life support (ACLS) team
D) Attach an automated external defibrillator (AED) and begin rhythm analysis
Answer: D) Attach an AED and begin rhythm analysis
Rationale: The AED is a rapid, life‑saving tool that can identify shockable rhythms and deliver a shock if indicated. Immediate rhythm analysis precedes other interventions.
1.2. Algorithmic Steps
Question 2
According to the 2020 ACLS guidelines, which sequence correctly represents the early steps in the advanced cardiac life support algorithm for a patient with ventricular fibrillation (VF)?
A) CPR → Defibrillation → Epinephrine → Amiodarone
B) Defibrillation → CPR → Epinephrine → Amiodarone
C) CPR → Epinephrine → Defibrillation → Amiodarone
D) Defibrillation → Epinephrine → CPR → Amiodarone
Answer: B) Defibrillation → CPR → Epinephrine → Amiodarone
Rationale: For shockable rhythms such as VF, the first response is immediate defibrillation. If the rhythm persists, CPR, epinephrine, and amiodarone follow in that order Not complicated — just consistent..
2. Arrhythmia Management
2.1. Identifying Rhythm Strips
Question 3
A 45‑year‑old male presents with sudden loss of consciousness. The ECG strip shows wide QRS complexes with a regular rhythm at 150 bpm, no discernible P waves, and a narrow, regular baseline. What is the most likely diagnosis?
A) Atrial fibrillation
B) Ventricular tachycardia (VT)
C) Supraventricular tachycardia (SVT)
D) Torsades de Pointes
Answer: B) Ventricular tachycardia (VT)
Rationale: VT presents with wide QRS complexes and a regular rhythm without visible P waves. SVT typically has narrow QRS complexes.
2.2. Pharmacologic Therapy
Question 4
Which drug is the first‑line pharmacologic agent for stable monomorphic VT in a hemodynamically stable patient?
A) Lidocaine
B) Amiodarone
C) Procainamide
D) Adenosine
Answer: B) Amiodarone
Rationale: Amiodarone is the preferred antiarrhythmic for stable monomorphic VT due to its efficacy and favorable safety profile in the acute setting.
2.3. Defibrillation Thresholds
Question 5
A patient with pulseless VT receives a 200‑J shock. The rhythm persists. What is the recommended next step according to ACLS guidelines?
A) Repeat 200‑J shock immediately
B) Administer 1 mg epinephrine IV
C) Perform synchronized cardioversion at 150 J
D) Switch to 360‑J shock
Answer: A) Repeat 200‑J shock immediately
Rationale: For pulseless VT, repeat unsynchronized shocks at the same energy level (200 J) are recommended until the rhythm changes or a pulse is restored.
3. Reversible Causes (The 4 H’s and 4 T’s)
3.1. Identification
Question 6
Which of the following is NOT one of the 4 H’s or 4 T’s of reversible causes in cardiac arrest?
A) Hypoxia
B) Hypovolemia
C) Hyperkalemia
D) Hypoglycemia
Answer: D) Hypoglycemia
Rationale: The 4 H’s are Hypoxia, Hypovolemia, Hypoxia (again), Hypo/Hyperkalemia, Hypothermia, and Hemorrhage. The 4 T’s are Tension pneumothorax, Tamponade, Thrombosis (pulmonary or coronary), and Thrombosis (cardiac). Hypoglycemia is not included That's the part that actually makes a difference. Took long enough..
3.2. Clinical Application
Question 7
A patient arrests during a dental procedure. The patient’s oxygen saturation was 85% before the event. Which reversible cause should be addressed first?
A) Hypotension
B) Hypoxia
C) Hyperkalemia
D) Hypothermia
Answer: B) Hypoxia
Rationale: Hypoxia is the most immediate reversible cause and must be corrected with high‑flow oxygen and airway management before other interventions It's one of those things that adds up..
4. Post‑Resuscitation Care
4.1. Targeted Temperature Management
Question 8
After ROSC (Return of Spontaneous Circulation), what is the recommended temperature range for targeted temperature management in comatose adults?
A) 32–34 °C
B) 35–36 °C
C) 36–37 °C
D) 37–38 °C
Answer: A) 32–34 °C
Rationale: Cooling to 32–34 °C for 24 hours has been shown to improve neurological outcomes in comatose survivors of cardiac arrest Worth keeping that in mind..
4.2. Hemodynamic Support
Question 9
A post‑resuscitation patient has a systolic blood pressure of 80 mmHg. Which vasoactive agent is most appropriate to raise the blood pressure?
A) Dopamine
B) Norepinephrine
C) Phenylephrine
D) Epinephrine
Answer: B) Norepinephrine
Rationale: Norepinephrine is the first‑line vasopressor for hypotension after ROSC due to its potent alpha‑adrenergic vasoconstrictive effect.
5. Practical Skill Questions
5.1. Chest Compressions
Question 10
What is the recommended compression depth for an adult patient during CPR?
A) 1–1.5 inches (2.5–4 cm)
B) 1.5–2 inches (3.8–5 cm)
C) 2–2.5 inches (5–6.4 cm)
D) 2.5–3 inches (6.4–7.6 cm)
Answer: C) 2–2.5 inches (5–6.4 cm)
Rationale: Adequate depth ensures sufficient cardiac output; deeper compressions are associated with improved survival.
5.2. Airway Management
Question 11
Which airway adjunct is recommended for patients with a suspected cervical spine injury during ACLS?
A) Bag‑mask ventilation
B) Supraglottic airway (SGA)
C) Endotracheal intubation with inline stabilization
D) Laryngeal mask airway (LMA)
Answer: C) Endotracheal intubation with inline stabilization
Rationale: Intubation with inline stabilization minimizes neck movement, providing a secure airway while protecting the cervical spine Simple as that..
6. Frequently Asked Questions (FAQ)
| Question | Answer |
|---|---|
| **What is the maximum number of AED shocks before considering a different rhythm?Here's the thing — ** | Usually 3–4 shocks; if rhythm persists, consider medication or advanced interventions. |
| Can epinephrine be given before the first shock in VF? | No; defibrillation should precede epinephrine for shockable rhythms. |
| Is amiodarone indicated for pulseless VT? | Yes, after at least 2 defibrillation attempts if the rhythm remains pulseless. |
| **Do we perform intubation during chest compressions?That said, ** | Yes, high‑quality CPR can continue with simultaneous intubation if the team is skilled. |
| When is vasopressin used in ACLS? | Historically, but current guidelines favor epinephrine; vasopressin is no longer standard in ACLS. |
Conclusion
Mastering ACLS test questions requires a blend of theoretical knowledge and practical application. By systematically reviewing cardiac arrest algorithms, arrhythmia recognition, reversible causes, post‑resuscitation care, and essential skills, clinicians can confidently tackle exam scenarios and, more importantly, deliver lifesaving care in real‑world emergencies. Continuous practice with these questions, coupled with simulation training, will solidify understanding and improve outcomes for patients experiencing cardiac arrest.
6.2. Rhythm‑Specific Pharmacology – “When to Add the Second Drug”
| Scenario | First‑line drug | When to add the second drug | Second‑line option | Key dosing tip |
|---|---|---|---|---|
| Pulseless VT / VF | Epinephrine 1 mg IV/IO every 3‑5 min | After the third defibrillation attempt or if the rhythm persists after the first epinephrine dose | Amiodarone 300 mg IV/IO bolus, then 150 mg infusion or Lidocaine 1–1.5 mg/kg IV/IO | Amiodarone can be given after the first epinephrine dose; lidocaine is an alternative when amiodarone is unavailable. Because of that, |
| Asystole / PEA | Epinephrine 1 mg IV/IO every 3‑5 min | No anti‑arrhythmic is indicated; focus on high‑quality CPR, reversible causes, and early ROSC evaluation | — | — |
| Stable Narrow‑Complex Tachycardia with a pulse | Adenosine 6 mg rapid IV push (follow with 12 mg if no conversion) | If adenosine fails and the patient remains unstable, consider beta‑blocker (esmolol) or calcium channel blocker (diltiazem) | — | Flush with 10‑20 mL of normal saline to ensure rapid delivery. |
| Unstable Wide‑Complex Tachycardia | Synchronized cardioversion (100‑200 J) | If rhythm persists, give amiodarone 150 mg IV/IO (or lidocaine 1‑1.5 mg/kg) | — | Cardioversion should precede drug administration when the patient is conscious or has a palpable pulse. |
7. Integrated Simulation Scenario
Case vignette:
A 58‑year‑old male is found unresponsive in a public gym. Bystanders have initiated CPR. EMS arrives 4 minutes later, finds a pulseless ventricular tachycardia on the monitor. The patient has a known history of coronary artery disease and is on a beta‑blocker.
Step‑by‑step decision pathway:
- Immediate defibrillation – 200 J biphasic shock (first shock).
- Resume CPR – 2 minutes of high‑quality compressions (rate ≥ 100/min, depth 5‑6 cm).
- Administer epinephrine – 1 mg IV/IO during the second 2‑minute CPR cycle.
- Second shock – 200 J biphasic.
- If VT persists, give amiodarone 300 mg IV/IO bolus (or 150 mg if prior dose given).
- Continue CPR with epinephrine every 3‑5 minutes.
- After ROSC, assess for ST‑segment changes; initiate targeted temperature management (33‑36 °C) for 24 hours, and start dual antiplatelet therapy plus high‑intensity statin.
Learning points
- Defibrillation precedes any medication for shockable rhythms.
- Epinephrine is given after the first shock, not before.
- Amiodarone is added only after at least two shocks have failed to terminate VT/VF.
- Post‑ROSC care (temperature control, hemodynamic optimization, and secondary prevention) is as critical as the arrest algorithm itself.
8. Quick‑Reference Cheat Sheet
| Algorithm | Key Action | Timing / Dose |
|---|---|---|
| VF/VT (shockable) | Immediate shock → CPR → epinephrine → repeat shock (max 3) → amiodarone | 200 J biphasic; epinephrine 1 mg q3‑5 min; amiodarone 300 mg bolus |
| Asystole/PEA (non‑shockable) | CPR → epinephrine → treat H’s & T’s | Epinephrine 1 mg q3‑5 min |
| Bradycardia with pulse | Atropine 0.5 mg IV q3‑5 min (max 3 mg) → consider dopamine/epinephrine infusion | 0.5‑1 µg/kg/min dopamine if needed |
| Torsades de pointes | Magnesium sulfate 2 g IV over 15 min | Repeat once if VT persists |
| Post‑ROSC | TTM, hemodynamic optimization, coronary angiography (if STEMI) | Target 33‑36 °C for 24 h |
9. Final Thoughts
The ACLS exam is not merely a test of memorized numbers; it evaluates the clinician’s ability to synthesize a rapid assessment, prioritize interventions, and execute them under pressure. By internalizing the algorithms, recognizing the “must‑do” versus “nice‑to‑have” steps, and practicing through case‑based questions and simulations, you will be prepared to both pass the exam and save lives when the next cardiac arrest occurs Practical, not theoretical..
Remember: High‑quality chest compressions, early defibrillation, timely epinephrine, and targeted post‑resuscitation care are the pillars of successful resuscitation. Keep rehearsing, stay current with guideline updates, and always approach each arrest with a clear, algorithm‑driven mindset.
