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Difficulty: EasyCardiovascular System

A 58-year-old man is found unresponsive on the floor of his hospital room. He has no palpable pulse and is not breathing. The emergency response team arrives with a crash cart. Arrange the following actions in the correct sequential order for managing this patient's cardiac arrest, assuming the initial rhythm identified on the monitor is ventricular fibrillation.

  1. 1Initiate high-quality cardiopulmonary resuscitation (CPR) and attach the cardiac monitor
  2. 2Deliver an unsynchronized defibrillation shock
  3. 3Administer intravenous epinephrine
  4. 4Administer intravenous amiodarone

Answer

The correct sequence is: 1) Initiate high-quality CPR and attach the monitor, 2) Deliver an unsynchronized defibrillation shock, 3) Administer intravenous epinephrine, 4) Administer intravenous amiodarone.
The Advanced Cardiac Life Support (ACLS) algorithm for ventricular fibrillation prioritizes immediate high-quality CPR to maintain perfusion, followed rapidly by unsynchronized defibrillation. If the rhythm is refractory to initial shocks, a vasopressor (epinephrine) is given to increase coronary perfusion pressure, and subsequently, an antiarrhythmic (amiodarone) is administered for shock-refractory ventricular fibrillation.

Step-by-Step Solution

1
Assess the patient and establish basic life support
The patient is pulseless, so high-quality CPR is initiated and the monitor is attached immediately.
Immediate CPR is critical to maintain perfusion to the brain and heart during cardiac arrest.
2
Identify the rhythm and intervene electrically
Ventricular fibrillation is noted on the monitor, and an immediate unsynchronized defibrillation shock is delivered.
Defibrillation is the only effective treatment to terminate ventricular fibrillation and must not be delayed.
3
Provide pharmacologic vasopressor support if refractory
Intravenous epinephrine is administered after unsuccessful initial shocks.
Epinephrine causes peripheral vasoconstriction, increasing aortic diastolic pressure and coronary perfusion during subsequent CPR.
4
Administer antiarrhythmic therapy
Intravenous amiodarone is given for shock-refractory ventricular fibrillation.
Amiodarone stabilizes the myocardium and increases the likelihood of successful electrical cardioversion on subsequent attempts.

Key Concept

Advanced Cardiac Life Support (ACLS) Pulseless Arrest Algorithm (Ventricular Fibrillation)
Estimated Time:1m 0s
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Topics

Cardiovascular System

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