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From the Departments of Neurosciences (Drs. Merdes, Hansen, Galasko, Hofstetter, Ho, Thal, and Corey-Bloom), Pathology (Dr. Hansen), and Psychiatry (Dr. Jeste), University of California, San Diego; and Neurology Service (Drs. Galasko, Thal, and Corey-Bloom), San Diego Veterans Affairs Medical Center, La Jolla, CA.
Address correspondence and reprint requests to Dr. Jody Corey-Bloom, Professor of Neurosciences, UCSD School of Medicine, VA Neurology Service (9127), 3350 La Jolla Village Drive, San Diego, CA 92161; e-mail: jcoreybl{at}vapop.ucsd.edu
Objective: To determine whether AD neurofibrillary pathology influences clinical diagnostic accuracy in dementia with Lewy bodies (DLB).
Background: Pathologic diagnosis of DLB mandates Lewy bodies but also allows for AD pathology in the form of plaques and tangles. Because clinical diagnostic accuracy of DLB remains low, the authors questioned whether the severity of AD pathology in the form of tangles might affect the clinician’s ability to correctly diagnose DLB in life. Design/Methods: Ninety-eight subjects with autopsy-proven DLB who had been evaluated annually at the University of California San Diego AD Research Center were identified. The clinical diagnosis used was the last diagnosis before death. Pathologic diagnosis of DLB was made according to Consensus guidelines, and Braak staging was used to assess the degree of neurofibrillary AD pathology. The clinical characteristics of subjects with DLB with low vs high Braak stages were compared and the clinical diagnostic accuracy for subjects stratified according to Braak stage was determined.
Results: Only 27% of the subjects with DLB demonstrated both visual hallucinations and spontaneous extrapyramidal signs (EPS). The low Braak stage (0 to 2, n = 24) subjects had a higher frequency of visual hallucinations (65%) than did subjects with DLB with higher (3 to 6, n = 66) Braak stages (33%, p = 0.008), and showed a slightly greater but not significant degree of EPS. Although clinical diagnostic accuracy for DLB was relatively low (49%), it was higher for subjects with low (75%) compared to high (39%) Braak stages (p = 0.0039).
Conclusions: The degree of concomitant AD tangle pathology has an important influence on the clinical characteristics and, therefore, the clinical diagnostic accuracy of DLB.
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