Objective: To determine if the published criteria for diagnosis of the persistent vegetative state could be applied to patients suffering from Alzheimer disease.
Design And Methods: Eighty-eight institutionalized patients with a diagnosis of possible or probable Alzheimer disease were evaluated for the presence of persistent vegetative state. Initial screening excluded patients who were able to do any of the following: feed themselves, respond to command, walk, or maintain continence of bowel and bladder. A sample of 12 of 28 patients unable to perform any of these functions was examined independently by 3 of us.
Results: During the first examination, 2 patients were diagnosed as being in a vegetative state by 2 of us and 3 additional patients by 1 of us. One of us did not diagnose any patient as being in a vegetative state. A second evaluation of the same patients was performed 2 months later, after holding a consensus meeting to standardize the evaluation procedure. During the second evaluation, the vegetative state was diagnosed in 6 patients but only by 1 of us.
Conclusion: The diagnostic disagreement between the neurologists indicate that Alzheimer disease may only rarely progress to the persistent vegetative state.
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