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1. The central feature required for a diagnosis of DLB is progressive cognitive decline of sufficient
magnitude to interfere with normal social or occupational function. Prominent or persistent memory
impairment may not necessarily occur in the early stages but is usually evident with progression.
Deficits on tests of attention and of frontal-subcortical skills and visuospatial ability may be especially
prominent.
2. Two of the following core features are essential for a diagnosis of probable DLB, and one is essential
for possible DLB:
a. fluctuating cognition with pronounced variations in attention and alertness
b. recurrent visual hallucinations that are typically well formed and detailed
c. spontaneous motor features of parkinsonism
3. Features supportive of the diagnosis are:
a. repeated falls
b. syncope
c. transient loss of consciousness
d. neuroleptic sensitivity
e. systematized delusions
f. hallucinations in other modalities
4. Diagnosis of DLB is less likely in the presence of:
a. stroke disease, evident as focal neurologic signs or on brain imaging
b. evidence on physical examination and investigation of any physical illness or other brain disorder
sufficient to account for the clinical picture
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