Hey, maybe you should look at the specific damage area in the brain. Objective observations are much more repeatable.
http://www.naric.com/research/rehab/record.cfm?search=2&type=all&criteria=J64332&phrase=no&rec=119475
Abstract: Study assessed predisposing and precipitating
risk factors for post-stroke delirium in order to create a predictive
model. One hundred patients were assessed daily for delirium during the
first week post stroke and risk factors were recorded. The following
predisposing or precipitating risk factors for delirium were evaluated
prospectively: patient characteristics, pre-stroke medical history,
stroke characteristics, pharmacological factors, medical complications,
and laboratory parameters. An episode of delirium was detected in 43
patients (43 percent). Higher age, metabolic disturbances, intracerebral
haemorrhage and larger ischemic hemispheric strokes increase the risk
of post-stroke delirium. Using multivariate logistic regression, 2
alternative predictive statistical models were developed using age,
stroke type, extent of lesion, and either certain metabolic
abnormalities or a more general scoring system of multiple organ
dysfunction or failure. In ischemic strokes, total anterior circulation
infarctions were more frequently associated with delirium (73.3 percent
developed delirium) compared with the remainder of the groups combined.
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