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Clicking "Arrived" is the action that specifically changes a patient's status in the Emergency Department. This action indicates that the patient has formally entered the department and is now being processed as part of the patient flow in the emergency care system. It typically triggers various workflows, alerts, and documentation processes, allowing clinical staff to begin assessment and treatment.

When a patient’s status is updated to "Arrived," it signifies an official acknowledgment of their presence in the facility, which is crucial for effective patient management and for ensuring that care is initiated promptly.

While actions such as assigning a nurse or changing a patient’s room number can be part of the overall workflow, they do not inherently change the patient's status within the emergency care context. Discharging a patient, although it alters their care status, is not involved in the initial check-in or patient flow process. Therefore, clicking "Arrived" is the most direct action that influences the patient's status in the Emergency Department setting.