Final answer:
The most appropriate course of action would be to verify a palpable pulse, attach the AED, and prepare to analyze.
Step-by-step explanation:
The most appropriate course of action to take next in this scenario would be to verify a palpable pulse, attach the AED, and prepare to analyze. Given the patient's history of heart attacks and the current unconscious state, it is crucial to assess for a pulse and initiate appropriate interventions. The AED can help determine if the patient is in a shockable rhythm and deliver a potentially life-saving electric shock if necessary.