A Biomarker for Alzheimer ’s Disease Based on Patterns of Regional Brain Atrophy

In this study, we developed a structural MR-based biomarker for in vivo detection of AD using a supervised machine learning approach. Based on an individual’s pattern of brain atrophy a continuous AD score is assigned which measures the similarity with brain atrophy patterns seen in clinical cases of AD.Methods: The underlying statistical model was trained with MR scans of patients and healthy controls from the Alzheimer’s Disease Neuroimaging Initiative (ADNI-1 screening). Validation was performed within ADNI-1 and in an independent patient sample from the Open Access Series of Imaging Studies (OASIS-1). In addition, our analyses included data from a large general population sample of the Study of Health in Pomerania (SHIP-Trend).Results: Based on the proposed AD score we were able to differentiate patients from healthy controls in ADNI-1 and OASIS-1 with an accuracy of 89% (AUC = 95%) and 87% (AUC = 93%), respectively. Moreover, we found the AD score to be significantly associated with cognitive functioning as assessed by the Mini-Mental State Examination in the OASIS-1 sample after correcting for diagnosis, age, sex, age·sex, and total intracranial volume (Cohen’s f2 = 0.13). Additional analyses showed that the prediction accuracy of AD status based on both the AD score and the MMSE score is significantly higher than when using just one of them. In SHIP-Trend we found the AD score to be weakly but significantly associated with a test of verbal memo...
Source: Frontiers in Psychiatry - Category: Psychiatry Source Type: research

Related Links:

When PET scans reveal elevated amyloid levels in cognitively normal older adults,...Read more on AuntMinnie.comRelated Reading: FDG-PET shows where exercise could stall Alzheimer's PET, MRI link amyloid plaque with swift decline Who should get brain scans for Alzheimer's disease? PET, MRI show physical activity aids brain health Would high amyloid level spur physician-assisted death?
Source: AuntMinnie.com Headlines - Category: Radiology Source Type: news
This article was corrected online.
Source: JAMA Neurology - Category: Neurology Source Type: research
AbstractAccurate, automated white matter hyperintensity (WMH) segmentations are needed for large-scale studies to understand contributions of WMH to neurological diseases. We evaluated Bayesian Model Selection (BaMoS), a hierarchical fully-unsupervised model selection framework for WMH segmentation. We compared BaMoS segmentations to semi-automated segmentations, and assessed whether they predicted longitudinal cognitive change in control, early Mild Cognitive Impairment (EMCI), late Mild Cognitive Impairment (LMCI), subjective/significant memory concern (SMC) and Alzheimer ’s (AD) participants. Data were downloaded ...
Source: Neuroinformatics - Category: Neuroscience Source Type: research
DISCUSSION: Our independently validated machine-learning model predicted cognitive decline in sporadic prodromal AD and may substantially reduce sample size needed in clinical trials in AD. PMID: 32043733 [PubMed - as supplied by publisher]
Source: The Journal of Alzheimers Association - Category: Psychiatry Tags: Alzheimers Dement Source Type: research
CONCLUSION: Our findings show that hippocampal subfield atrophy varies among the three study groups. PMID: 32008518 [PubMed - in process]
Source: Current Medical Imaging Reviews - Category: Radiology Tags: Curr Med Imaging Rev Source Type: research
No abstract available
Source: Neurology Today - Category: Neurology Tags: In the Pipeline Source Type: research
(Wiley) New findings published in the Scandinavian Journal of Medicine&Science in Sports reveal how physically active older adults benefit from reduced risks of early death, breast and prostate cancer, fractures, recurrent falls, functional limitations, cognitive decline, dementia, Alzheimer's disease, and depression.
Source: EurekAlert! - Social and Behavioral Science - Category: International Medicine & Public Health Source Type: news
ConclusionThe presence of microbleeds in DLB is associated with higher blood pressure, but not with other measures of vascular disease or amyloid deposition. The relationship between microbleeds and clinical presentation remains unclear.
Source: Journal of Neurology - Category: Neurology Source Type: research
In Reply The Letter to the Editor by Montero-Odasso and colleagues addresses noncognitive manifestations of Alzheimer disease (AD). Their letter discusses a recent article from the Mayo Clinic. Using positron emission tomography biomarkers of amyloidosis (A) and tauopathy (T), the Mayo study examined the age- and sex-specific prevalence of 3 biologically defined entities: amyloidosis (A+) regardless of tau status, A+T −, and A+T+. We compared the age and sex specific prevalence of these 3 biomarker-defined entities with 3 clinical syndromes commonly associated with AD: clinically defined probable AD using the McKhann...
Source: JAMA Neurology - Category: Neurology Source Type: research
Conclusion: Tau accumulation likely started in the more affected anterior node and, at the disease stage at which we studied these patients, appeared as well in the brain region (in the temporal lobe) spatially separate from but most connected with it. The arcuate fasciculus, connecting both of them, was most severely affected anteriorly, as would correspond to a loss of axons from the anterior node. These findings are suggestive of tau propagation from node to connected node in a natural human brain network and support the idea that neurons that wire together die together.
Source: Journal of Nuclear Medicine - Category: Nuclear Medicine Authors: Tags: Clinical Source Type: research
More News: Alzheimer's | Brain | Learning | Men | Neurology | PET Scan | Psychiatry | Statistics | Study | Universities & Medical Training