In post-MI heart failure, which medication timing is recommended?

• A. ACE-inhibitor within 24 hours
• B. RAAS inhibitor prior to discharge (ideally within 7 days)
• C. NO BETA-BLOCKER within 24 hours; re-evaluate candidacy prior to discharge
• D. Initiate calcium channel blocker within 48 hours

Answer: (B)

Early RAAS blockade after an MI with heart failure is key to improving survival and limiting adverse remodeling. Initiating a RAAS inhibitor during the hospital stay and having it started before discharge, ideally within the first week, ensures patients are tolerating the therapy and are set up to continue it after leaving the hospital. This timing captures the cardioprotective benefits when neurohormonal activation is greatest, without waiting until after discharge when benefits may be lost or adherence may drop. ACE inhibitors are typically first-line and can be continued or switched to an ARB if needed; starting them within the hospital stay helps normalize hemodynamics and supports long-term outcomes.

Starting an ACE inhibitor within 24 hours isn’t universally required for all patients, and the key emphasis is achieving initiation before discharge within about 7 days. Beginning a beta-blocker within 24 hours is beneficial if the patient is stable, but the question focuses on RAAS blockade as the optimal timing; calcium channel blockers within 48 hours are not preferred in this setting due to limited mortality benefit and potential negative inotropy in heart failure post-MI.