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New Study Shows Beta-Amyloid Imaging is Associated with Altered Diagnosis and Management of Alzheimer's Disease
Date:7/16/2014

tic work-up. In particular, the study evaluated if patients who met the working definition of the AUC would be more affected than those who did not. The AUC guidelines propose that patients who are being evaluated for dementia with atypical presentations, younger patients, and patients with unexplained mild cognitive impairment, are most appropriate for amyloid PET imaging. For the patient to be included in the study, Alzheimer's disease had to be under consideration and the treating physician had to have uncertainty regarding the diagnosis.

Results showed that 59 percent of subjects met the working definition of AUC. Forty-seven percent of the AUC-like cases were amyloid positive compared to 62 percent of non-AUC cases. Diagnosis changed after PET scan for 58 percent of AUC cases versus 45 percent of non-AUC cases (p=0.10). The proportion of patients with change in management plan was high for both AUC (88 percent) and non-AUC (77 percent) cases. In particular, the use of Alzheimer's disease medications including cholinesterase inhibitors, or memantine, declined after a negative florbetapir F 18 scan by 20 percent (from 26/54 to 15/54 cases; p=0.002) in AUC cases and by 33 percent (from 17/27 to 8/27 cases; p=0.004) in non-AUC cases. Diagnoses for non-AUC cases in which Alzheimer's disease medications were withdrawn after a negative scan included prodromal Alzheimer's disease/mild cognitive impairment due to Alzheimer's disease (n=8), or mild cognitive impairment of uncertain etiology (n=1). This study found that patients with an uncertain diagnosis, but who are not otherwise explicitly captured by AUC, may be reasonable candidates for amyloid imaging.

"Alzheimer's disease is one of many possible causes of cognitive impairment, which can make diagnosis challenging. In fact, it is estimated that up to one in five patients clinically diagnosed with probable Alzheimer's disease during life do not exhibit Alzheimer's disease pathology upon autopsy[
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SOURCE Eli Lilly and Company
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