Incidence of cerebral microbleeds in preclinical Alzheimer disease
Journal article
Yates, Paul A., Desmond, Patricia M., Phal, Pramit M., Steward, Christopher, Szoeke, Cassandra, Salvado, Olivier, Ellis, Kathryn A., Martins, Ralph N., Masters, Colin L., Ames, David, Villemagne, Victor L. and Rowe, Christopher C.. (2014). Incidence of cerebral microbleeds in preclinical Alzheimer disease. Neurology. https://doi.org/10.1212/WNL.0000000000000285
Authors | Yates, Paul A., Desmond, Patricia M., Phal, Pramit M., Steward, Christopher, Szoeke, Cassandra, Salvado, Olivier, Ellis, Kathryn A., Martins, Ralph N., Masters, Colin L., Ames, David, Villemagne, Victor L. and Rowe, Christopher C. |
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Abstract | Objective: We sought to determine the incidence and associations of lobar microbleeds (LMBs) in a longitudinal cohort with 11C–Pittsburgh compound B (PiB) PET imaging. Methods: One hundred seventy-four participants from the observational Australian Imaging, Biomarkers and Lifestyle Study of Ageing (97 with normal cognition [NC], 37 with mild cognitive impairment [MCI], and 40 with Alzheimer disease [AD] dementia) were assessed at 3 time points over 3 years with 3-tesla susceptibility-weighted MRI and 11C-PiB PET. MRIs were inspected for microbleeds, siderosis, infarction, and white matter hyperintensity severity, blind to clinical and PiB findings. Neocortical PiB standardized uptake value ratio, normalized to cerebellar cortex, was dichotomized as positive or negative (PiB+/−, standardized uptake value ratio > 1.5). Annualized LMB incidence was calculated, and logistic regression was used to determine the association of incident LMBs with PiB, APOE ε4+ status, and cerebrovascular disease. Results: LMBs were present in 18.6% of NC, 24.3% of MCI, and 40% of AD participants (p < 0.05 vs NC). LMB incidence was 0.2 ± 0.6 per year in NC participants, 0.2 ± 0.5 in MCI, and 0.7 ± 1.4 in AD (p < 0.03 vs NC) and was 6-fold higher in PiB+ than PiB-NC. Incident LMBs were associated with age, APOE ε4+, PiB+, and baseline LMBs. Incidence of multiple LMBs was also associated with lacunar infarction and white matter hyperintensity severity. Conclusions: Older age, baseline LMBs, higher β-amyloid burden, and concomitant cerebrovascular disease may all confer higher risk of incident LMBs. This should be considered when designing protocols for amyloid-modifying clinical trials. |
Year | 2014 |
Journal | Neurology |
Publisher | Lippincott Williams & Wilkins |
Digital Object Identifier (DOI) | https://doi.org/10.1212/WNL.0000000000000285 |
Research Group | Institute for Health and Ageing |
Publisher's version | File Access Level Controlled |
Place of publication | United States of America |
https://acuresearchbank.acu.edu.au/item/8q1q8/incidence-of-cerebral-microbleeds-in-preclinical-alzheimer-disease
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