When should a STEMI alert be initiated?

• A. After stabilization on scene
• B. After troponin results are available
• C. If criteria for STEMI are met during assessment.
• D. Once transport to the hospital is arranged

Answer: (C)

Initiate a STEMI alert as soon as the patient meets STEMI criteria during assessment. The moment you have a scenario where the patient’s symptoms and objective findings indicate a STEMI (for example, chest pain consistent with ischemia plus ST-segment elevation on the ECG in two contiguous leads, or a new left bundle branch block that hides ischemic changes), you should trigger the alert. This rapid prehospital notification allows the receiving hospital’s cath lab and STEMI team to mobilize and prepare for urgent reperfusion, reducing time to treatment.

Troponin results are not used to initiate the alert because they take time to become elevated and aren’t reliable for immediate decision-making in the field. Waiting for stabilization or for transport to be arranged can delay critical reperfusion; actions to diagnose and alert can and should occur concurrently with stabilization and while arranging transport.