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Difficulty: MediumCardiovascular System

A 62-year-old man collapses while walking in the hospital corridor. He is unresponsive, apneic, and has no palpable carotid pulse. A crash cart is immediately brought to the scene, and chest compressions are initiated. The cardiac monitor displays coarse ventricular fibrillation. Arrange the following critical resuscitation steps in the most appropriate chronological order according to standard advanced cardiovascular life support (ACLS) guidelines.

  1. 1Deliver the first unsynchronized countershock (defibrillation)
  2. 2Resume chest compressions immediately for 2 minutes and establish intravenous (IV) or intraosseous (IO) access
  3. 3Perform a rhythm check, deliver a second unsynchronized countershock if indicated, and resume CPR
  4. 4Administer epinephrine 1 mg IV/IO during the ongoing cycle of CPR
  5. 5Deliver a third unsynchronized countershock and administer amiodarone 300 mg IV/IO

Answer

The correct sequence prioritizes immediate defibrillation, followed by uninterrupted CPR with IV/IO access, a second shock followed by epinephrine, and a third shock followed by an antiarrhythmic like amiodarone.
According to the adult ACLS cardiac arrest algorithm for shockable rhythms (VF/pVT), the correct chronological sequence is: 1) Deliver a shock as soon as the defibrillator is ready. 2) Immediately resume CPR for 2 minutes while establishing IV/IO access. 3) Perform a rhythm check, and if VF persists, deliver a second shock. 4) Resume CPR and administer epinephrine (1 mg every 3-5 minutes). 5) If VF persists at the next rhythm check, deliver a third shock and administer an antiarrhythmic (e.g., amiodarone 300 mg) during the subsequent CPR cycle.

Step-by-Step Solution

1
Identify the rhythm and prioritize initial interventions.
The rhythm is ventricular fibrillation (VF), an immediately shockable rhythm.
The absolute highest priority for VF is defibrillation. Chest compressions should occur while the machine charges, but the shock is the primary definitive intervention.
2
Determine the immediate post-shock management.
High-quality CPR is resumed immediately for 2 minutes without checking for a pulse, while vascular access is obtained.
Minimizing pauses in chest compressions is critical for survival. Rhythm checks only occur after 2-minute cycles.
3
Sequence the subsequent pharmacological interventions.
Epinephrine is given during CPR after the second shock, and amiodarone is given during CPR after the third shock.
ACLS guidelines sequentially escalate therapy for refractory shockable rhythms, starting with a vasopressor to maintain perfusion pressure, followed by an antiarrhythmic if the arrest persists.

Key Concept

Advanced Cardiovascular Life Support (ACLS) Pulseless Arrest Algorithm (Ventricular Fibrillation/Pulseless Ventricular Tachycardia)
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Topics

Cardiovascular System

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