I hope they have checked a UA, CBC, renal panel, and liver function tests, possibly a head CT, and reviewed his medications. Is he wearing his glasses and/or hearing aid? I know all this sounds obvious, but when my father-in-law was hospitalized, his nurse told me over the phone they were having alot of trouble getting his blood sugar down. When I got there, he had D5 hanging... I don't assume anything anymore.
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