These are a few pearls from a talk by S. Andrew Josephson MD at UCSF's 17th annual hospital medicine conference.
Dementia with Lewy bodies (DLB)
Associated with parkinsonism.
Has a fluctuating course so may present as delirium.
Antipsychotics contraindicated. Cholinergics help.
Here are some links  
Tests may be negative initially. Speaker's comment: “We start a lot of confused patients on acyclovir.” (IV).
Triad: confusion, ataxia, occulomotor.
Alcoholism no longer the leading risk factor!
Low threshold to give IV thiamine in confused patient.
Non pharmacologic modalities are the treatment of choice. Drugs as a last resort (exception: ETOH withdrawal).
Benzos make it worse (exception: ETOH).
Antipsychotics may be necessary but contraindicated in some patients (e.g. Lewy body).