Regarding beta-blocker use within the first 24 hours after MI, which statement is true?

• A. Beta-blockers should not be given within the first 24 hours; candidacy should be reevaluated before discharge
• B. Beta-blockers must be given within the first 24 hours in all patients
• C. Beta-blockers are contraindicated in all MI patients
• D. Beta-blockers should be given only if blood pressure is low

Answer: (A)

The key idea is that timing matters for beta-blocker use after a myocardial infarction. In the first 24 hours, patients can be hemodynamically unstable, with risks of hypotension, bradycardia, and heart failure worsening. Because of that, beta-blockers are not routinely started right away; instead, you withhold them and reassess the patient’s candidacy as stabilization occurs, typically before discharge. This approach aims to still gain the long-term mortality and arrhythmia-reduction benefits of beta-blockers, but only once the patient is sufficiently stable to tolerate them.

The other statements are too absolute or wrong in concept: starting beta-blockers in all patients within 24 hours ignores instability that would make it dangerous, labeling beta-blockers as contraindicated in all MI patients is incorrect because many patients can benefit when stable, and requiring low blood pressure as the condition to give them misstates that hypotension is a contraindication, not a trigger to administer.