Why is exercise treadmill testing contraindicated in the ED when ACS is suspected?

• A. It is the best initial test for ACS
• B. It can provoke myocardial ischemia and is unsafe; ACS must be ruled out first
• C. It has no risk
• D. It confirms ACS immediately

Answer: (B)

In suspected ACS, exercise treadmill testing is avoided because it raises the heart’s workload and oxygen demand, which can provoke or worsen myocardial ischemia, trigger arrhythmias, or cause hemodynamic instability. The priority in the ED is to rapidly evaluate for active ischemia using continuous monitoring, serial troponins, and ECG, and to start appropriate management if ACS is present. A treadmill stress test cannot confirm ACS immediately and may delay definitive treatment while risking patient deterioration. It’s better used later, after ACS has been ruled out and the patient is stabilized, for risk stratification in truly stable patients.