What hearing devices work best for middle stage alzhemier's patient, older, no short term memory, at home cared for by 88 yr. old husband?

This is something only an audiologist can decide. I would suggest that comfort and ease of use be high on the list. You may want to talk to the doctor who handles her Alzheimer's about this first, as he or she may have suggestions. It will be difficult to get an accurate hearing test done, so there may be general devices that could help. However, a doctor should be consulted. I know this is hard. Getting glasses for my dad was a huge deal since he couldn't be tested in the "normal" manner.
Good luck,
Carol

Adding a hearing device at this stage of the disease may be almost catastrophic! Hearing devices amplify all sounds - not just spoken words but background noises (air conditioning, chairs scraping on floors, etc) that most of us tune out. For a demented individual, especially at this stage of the disease to suddenly be bombarded with all these noises they are unable to filter, it may be stimulation overload!