Final answer:
After CPR and defibrillation for sudden cardiac death post MI, further monitoring, medication administration, and interventions are necessary to stabilize the patient's condition.
Step-by-step explanation:
After resumption of cardiac activity through CPR and defibrillation for sudden cardiac death following an acute myocardial infarction (MI), the next step would be to continue monitoring the patient's vital signs and administer appropriate medications or interventions to stabilize their condition. This may include administering oxygen, providing medications to support cardiac function, and monitoring for arrhythmias or other complications. The patient would likely be transferred to a cardiac care unit or intensive care unit for further monitoring and treatment.