Why should you avoid beta-blockers in ACS patients with signs of shock or severe bradycardia?

• A. They can cause headaches
• B. They can worsen hypotension and reduce cardiac output
• C. They slow conduction through AV node
• D. They improve outcomes

Answer: (B)

In ACS with signs of shock or severe bradycardia, keeping blood flow to vital organs is the priority. Beta-blockers slow the heart rate and reduce the heart’s contractile force, which lowers cardiac output. In a patient already in shock or with very slow heart rate, this further decrease in forward blood flow can drop blood pressure and worsen perfusion. That’s why they’re avoided in this situation—they can make hypotension worse and hinder recovery of circulation.

Options mentioning headaches or AV nodal slowing describe effects of beta-blockers but don’t capture the dangerous hemodynamic impact in shock. Saying they improve outcomes is not correct in this acute context.