Which medication is a first-line agent for managing cardiac arrest?

• A. Amiodarone
• B. Epinephrine
• C. Atropine
• D. Lidocaine

Answer: (B)

During cardiac arrest, the main goal is to maximize blood flow to the heart and brain during CPR. Epinephrine is the first-line pharmacologic choice because its alpha-adrenergic effects cause vasoconstriction, which raises the aortic diastolic pressure and improves coronary and cerebral perfusion during chest compressions. This perfusion boost increases the chances of return of spontaneous circulation and survival. It’s given intravenously or intraosseously at regular intervals (typically every 3–5 minutes) and is used in both shockable (VF/pVT) and non-shockable (asystole/PEA) rhythms as part of ACLS.

Other drugs have different roles. Antiarrhythmics like amiodarone or lidocaine are used after initial defibrillation attempts in persistent shockable rhythms, to help maintain an organized rhythm. Atropine used to be considered for certain bradycardias, but it is not a routine first-line agent in cardiac arrest. Epinephrine’s broad effect on improving perfusion makes it the best initial pharmacologic choice in this scenario.