What is the first action when a patient has severe chest pain?

Initiating oxygen therapy and assessing the patient is the first action to take when a patient presents with severe chest pain. Administering oxygen can help improve tissue oxygenation, especially in cases that might suggest conditions like myocardial ischemia or other cardiac issues. This immediate action supports the patient's vital needs while also providing critical information about their condition.

Assessment is equally important as it helps determine the cause of the chest pain, guiding further treatment. Gathering vital signs, obtaining a detailed history, and understanding the characteristics of the pain can provide essential information. This initial evaluation allows EMS providers to prioritize additional interventions, such as administering medications or preparing for transport.

Administering aspirin is a common practice in cases of suspected myocardial infarction, but it usually follows a baseline assessment. Likewise, calling for advanced life support might be necessary if the patient's condition necessitates more advanced care; however, the immediate focus should be on assessment and basic interventions like oxygen therapy. Applying an AED is typically reserved for patients who exhibit cardiac arrest or life-threatening arrhythmias, so it would not be the appropriate first action in this situation where the patient is conscious and experiencing chest pain.