Abstract
Patients with Alzheimer’s disease (AD) often develop extrapyramidal signs (EPS), which increase in frequency as the disease progresses. We aimed to investigate the patterns of presentation of EPS in AD and their correlation with clinical and neuropathological features. 4284 subjects diagnosed with AD from the National Alzheimer’s Coordinating Center (NACC) database with at least one abnormal Unified Parkinson’s Disease Rating Scale (UPDRS) assessment were included. Individuals were assigned to a discovery sample and a sensitivity analysis sample (moderate and mild dementia, respectively) and a subset of subjects provided neuropathological data (n = 284). Individuals from the Washington Heights and Inwood Columbia Aging Project (WHICAP) served as validation sample. Patterns of presentation of EPS were identified employing categorical principal component analysis (CATPCA). Six principal components were identified in both mild and moderate AD samples: (I) hand movements, alternating movements, finger tapping, leg agility (“limbs bradykinesia”); (II) posture, postural instability, arising from chair, gait and body bradykinesia/hypokinesia (“axial”); (III) limb rigidity (“rigidity”); (IV) postural tremor; (V) resting tremor; (VI) speech and facial expression. Similar results were obtained in the WHICAP cohort. Individuals with hallucinations, apathy, aberrant night behaviors and more severe dementia showed higher axial and limb bradykinesia scores. “Limb bradykinesia” component was associated with a neuropathological diagnosis of Lewy body disease and “axial” component with reduced AD-type pathology. Patterns of EPS in AD show distinct clinical and neuropathological correlates; they share a pattern of presentation similar to that seen in Parkinson’s disease, suggesting common pathogenic mechanisms across neurodegenerative diseases.
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Abbreviations
- TRACTRHD/LHD:
-
Postural tremor of right and left hand
- TRESRHD/LHD:
-
Resting tremor of right and left hand
- TAPSRT/LF:
-
Finger tapping of right and left hand
- HANDMOVR/L:
-
Hand movements of right and left hand
- LEGRT/LF:
-
Leg agility of right and left leg
- RIG-NECK/DLORT/DLOLF/DUPRT/DUPLF:
-
Rigidity of neck, right leg, left leg, right arm and left arm
- FACEXP:
-
Face expression
- BRADYKIN:
-
Body bradykinesia and hypokinesia
- ARISING:
-
Arising from chair
- POSSTAB:
-
Postural stability
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Acknowledgments
The NACC database is funded by the NIA/NIH Grant U01 AG016976. NACC data were contributed by the NIA-funded ADCs: P30 AG019610 (PI Eric Reiman, MD), P30 AG013846 (PI Neil Kowall, MD), P50 AG008702 (PI Scott Small, MD), P50 AG025688 (PI Allan Levey, MD, PhD), P30 AG010133 (PI Andrew Saykin, PsyD), P50 AG005146 (PI Marilyn Albert, PhD), P50 AG005134 (PI Bradley Hyman, MD, PhD), P50 AG016574 (PI Ronald Petersen, MD, PhD), P50 AG005138 (PI Mary Sano, PhD), P30 AG008051 (PI Steven Ferris, PhD), P30 AG013854 (PI M. Marsel Mesulam, MD), P30 AG008017 (PI Jeffrey Kaye, MD), P30 AG010161 (PI David Bennett, MD), P30 AG010129 (PI Charles DeCarli, MD), P50 AG016573 (PI Frank LaFerla, PhD), P50 AG016570 (PI David Teplow, PhD), P50 AG005131 (PI Douglas Galasko, MD), P50 AG023501 (PI Bruce Miller, MD), P30 AG035982 (PI Russell Swerdlow, MD), P30 AG028383 (PI Linda Van Eldik, PhD), P30 AG010124 (PI John Trojanowski, MD, PhD), P50 AG005133 (PI Oscar Lopez, MD), P50 AG005142 (PI Helena Chui, MD), P30 AG012300 (PI Roger Rosenberg, MD), P50 AG005136 (PI Thomas Montine, MD, PhD), P50 AG033514 (PI Sanjay Asthana, MD, FRCP) and P50 AG005681 (PI John Morris, MD). Dr. Tosto was supported by the DoD Grant W81XWH-12-1-0013. Dr. Tosto had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Dr. Tosto, Ms. Monsell, Dr. Hawes and Dr. Mayeux report no disclosures.
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Studies have been approved by the Institutional Review Boards and have been performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
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Tosto, G., Monsell, S.E., Hawes, S.E. et al. Pattern of extrapyramidal signs in Alzheimer’s disease. J Neurol 262, 2548–2556 (2015). https://doi.org/10.1007/s00415-015-7886-1
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DOI: https://doi.org/10.1007/s00415-015-7886-1