A 55-year-old hospitalized man collapses while walking in the telemetry unit hallway. He is unresponsive, and no carotid pulse is palpable. A code blue is activated, and high-quality cardiopulmonary resuscitation (CPR) is initiated. The defibrillator pads are applied, and the monitor displays coarse ventricular fibrillation.
Arrange the following critical management steps in the chronological order they should be performed according to advanced cardiovascular life support (ACLS) protocols, assuming the patient remains in refractory ventricular fibrillation throughout the resuscitation.
- 1Deliver a high-energy unsynchronized biphasic shock
- 2Immediately resume chest compressions without a pulse check
- 3Pause compressions to perform a rhythm check
- 4Administer 1 mg of intravenous epinephrine
- 5Administer 300 mg of intravenous amiodarone
Answer
The correct sequence for managing refractory ventricular fibrillation begins with immediate defibrillation (shock), followed instantly by 2 minutes of chest compressions without a rhythm check. A rhythm check is performed after the 2 minutes of CPR. Epinephrine is introduced during the CPR cycle following the second shock, and amiodarone is reserved for VF that is refractory to three shocks.
The ACLS algorithm for shockable rhythms (VF/pVT) dictates a strict chronological sequence to maximize coronary perfusion and survival. The sequence begins with immediate defibrillation. Because the post-shock myocardium is temporarily stunned, CPR must be resumed instantly for 2 minutes without pausing to check the rhythm or pulse. After 2 minutes, a rhythm check is performed. If VF persists, a second shock is given, and epinephrine is administered during the subsequent 2 minutes of CPR. If VF is still present at the next rhythm check, a third shock is delivered, and an antiarrhythmic (amiodarone or lidocaine) is administered during that CPR cycle.
Step-by-Step Solution
Key Concept
Advanced Cardiovascular Life Support (ACLS) sequencing for Ventricular Fibrillation