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It's not dementia, it's delerium.
as I understand it, the LEADING CAUSE of an "acute confusional state" in
elderly folks is UTIs.
Ever had pneumonia? That can be incredibly delirium-causing, too.
Behavioural indicators of Delirium consists of actions such as
(a) "picking at bedclothes/body",
(b) talking/mumbling speech, (talking to someone who is not there) --
person is NOT oriented to Place/Time/Person
(b) trying to get up and move when it is unsafe.
There is a Delirium/Dementia/Depression document available at
www.rnao.org.
The three conditions can appear very very similar, AND may overlap.
For an objective measure, you may want to do the CAM test with him
("Confusion Assessment Method"). The scores are pretty reliable.
You should be able to find it on Google.
Another test is "clock drawing". Can he draw a clock with the outer
circle, numbers and arms all in the right places? If not, this suggests
cortical decline (temporary or permanent).
HTH,
Emma