When is the first epinephrine dose given in a witnessed VF/VT arrest?

When is the first epinephrine dose given in a witnessed VF/VT arrest?

• A. After ROSC
• B. After the 2nd defibrillation, if witnessed
• C. After the first defibrillation
• D. After 3rd shock

Answer: (B)

In a witnessed VF or VT arrest, the top priority is rapid defibrillation and high-quality CPR. The first dose of epinephrine is given after the second defibrillation attempt. This timing allows immediate shocks to be delivered to try to restore a perfusing rhythm, while reserving vasopressor support to boost cerebral and coronary perfusion during ongoing CPR once two shocks have been attempted. Giving epinephrine after the first shock would delay a second defibrillation, which can reduce the chances of return of spontaneity in a shockable rhythm. It’s not given after ROSC, and it’s not administered after the third shock; the sequence is to shock, shock again, then administer epinephrine if still in arrest.

In a witnessed VF or VT arrest, the top priority is rapid defibrillation and high-quality CPR. The first dose of epinephrine is given after the second defibrillation attempt. This timing allows immediate shocks to be delivered to try to restore a perfusing rhythm, while reserving vasopressor support to boost cerebral and coronary perfusion during ongoing CPR once two shocks have been attempted. Giving epinephrine after the first shock would delay a second defibrillation, which can reduce the chances of return of spontaneity in a shockable rhythm. It’s not given after ROSC, and it’s not administered after the third shock; the sequence is to shock, shock again, then administer epinephrine if still in arrest.