Final answer:
The best discharge plan for an elderly patient confusing medications is a referral to a home health care agency to ensure medication management and proper care at home.
Step-by-step explanation:
When planning for the patient's discharge from hospitalization for acute decompensated heart failure, while addressing the concern that the patient lives alone and often confuses medication, a nurse would most appropriately refer to a home health care agency. This service would help manage the patient's medications and aid in daily activities as needed, which can prevent future hospital readmissions and ensure the patient's safety and health in their home environment. This option allows the elderly patient to maintain some independence while ensuring they receive the necessary care.