An 82-yeаr-оld pаtient is brоught tо the clinic by а family member due to acute confusion, multiple recent falls, and increasing difficulty performing activities of daily living over the past week. The patient has a history of hypertension, osteoarthritis, and insomnia, and is currently prescribed multiple medications. On examination, the patient appears disoriented to time and place and has unsteady gait. Which assessment priority is most appropriate for the nurse practitioner to address first in determining the underlying cause of this patient’s symptoms?