ACLS algorithm for pulseless VT/VF in ACS?

• A. Defibrillate after 10 minutes of CPR
• B. Immediate high-quality CPR, early defibrillation, epinephrine every 3–5 minutes, and amiodarone if refractory to defibrillation
• C. Observe with aspirin
• D. Use lidocaine as first-line

Answer: (B)

In a patient with a shockable arrest rhythm during ACS, the priorities are to restore perfusion quickly and then support the rhythm with medications if defibrillation alone doesn’t succeed. The best approach is high-quality CPR right away to maintain cerebral and coronary blood flow, deliver defibrillation as soon as a shockable rhythm is identified, and use medications during ongoing CPR to improve chances of return of spontaneous circulation.

Epinephrine given every few minutes during CPR helps increase coronary and cerebral perfusion pressure, which supports survival outcomes. If the rhythm remains VF or pulseless VT after initial defibrillation attempts, amiodarone is added to help stabilize and eventually convert the rhythm, improving the likelihood of a successful defibrillation and ROSC.

Why not the other options: waiting to defibrillate for an extended period (like after a long CPR run) delays a critical, time-sensitive treatment and lowers survival chances. Aspirin is beneficial for a non-arrest ACS patient but provides no immediate benefit during pulseless cardiac arrest. Lidocaine has largely been superseded by amiodarone as the preferred antiarrhythmic for refractory VT/VF in ACLS. After ROSC, management focuses on treating the underlying ACS, but during the arrest the described sequence is the correct ACLS approach.