Which occurrence would necessitate an immediate investigation and response?

A patient fall is a significant event that requires immediate investigation and response due to the potential for serious injury. Falls can lead to various complications, including fractures, head injuries, or even a decline in the patient’s overall health status. It is critical to assess the situation promptly to determine the cause of the fall, evaluate the patient's condition, and implement necessary interventions to prevent further incidents. This response ensures the safety of the patient and allows healthcare providers to adjust care plans as needed.

In contrast, routine check-ups, satisfaction surveys, and routine medication administration do not typically warrant immediate action. While these occurrences are important in the overall care process, they do not present an immediate risk to the patient or require urgent assessment and intervention in the same way that a patient fall does.