What is the immediate action required for a suspected STEMI?

The immediate action required for a suspected ST-Elevation Myocardial Infarction (STEMI) is to perform an immediate 12 lead ECG. This is critical because a 12 lead ECG provides detailed information about the heart's electrical activity and can help identify the presence of ST segment elevation, which is indicative of a STEMI. Quick recognition of this condition is essential for timely medical intervention, which can significantly improve outcomes for the patient.

Other options may be important in the overall management of a suspected STEMI, but they do not take priority as the initial action. While performing a physical exam and administering aspirin are important components of patient care, they do not provide the immediate diagnostic information necessary to confirm a STEMI and guide further treatment. Calling a cardiologist may also be part of the protocol once a STEMI is confirmed, but again, it is not the immediate action required at the onset of suspicion. Therefore, performing an immediate 12 lead ECG is the most crucial and time-sensitive step in the management of a suspected STEMI.