[PDF] Early Indicators Of Cognitive Decline Alzheimers Disease And Related Dementias Captured By Neurophysiological Tools eBook
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Major neurocognitive disorders are one of the leading causes of disability and dependency among the elderly worldwide. Notably, their far-reaching impact extends beyond the estimated 50 million people currently living with a major neurocognitive disorder. As the conversion to Alzheimer's disease (AD) progresses, patients’ symptoms (e.g., memory loss, severe impairments in thinking and behavior) place a heavy toll on their caregivers, family, and friends, who face emotional frustration, coupled with great financial stress. Furthermore, in terms of global cost estimation, the World Health Organization predicted that by 2030, the treatment of patients with AD and other forms of acquired cognitive impairment will cost the healthcare system US$1.7 trillion (or US$2.8 trillion, if corrected for the increase in care costs).
In 2011, National Institute on Aging and Alzheimer's Association joint task forces released proposed criteria for Alzheimer' disease diagnosis. These proposals included revisions to the nearly 30-year-old NINDS-ADRDA criteria for Alzheimer's diagnosis and added criteria for diagnosis of Mild Cognitive Impairment (MCI) due to Alzheimer's disease. The same year the American Psychiatric Association proposed new criteria for major and minor neurocognitive disorders (the entities previously known as dementia and mild cognitive impairment, respectively). These new criteria reflect the research and clinical advances in identifying mild cognitive impairment and offer new opportunities for prevention, treatment, and management of neurodegenerative conditions. A major focus of this book is on the mild cognitive impairment prodrome of the common dementias. In addition to discussing the most common neurodegenerative conditions, many rare neurodegenerative conditions are highlighted. Most chapters include an autopsy-confirmed case presentation from the authors' files. Following the case presentation, those chapters present current diagnostic criteria, epidemiology, neuropathology/neurophysiology, genetics, neuroimaging studies as relevant, associated clinical features, differential neuropsychological features and possible interventions for each disorder. The pace of change in research and practice in the field of normal cognitive aging and dementia is increasing almost as fast as the median age of the population. The massive baby boom population bubble is currently entering the age of risk for neurodegenerative conditions. Neuropsychologists will play a major role in refining and applying these diagnoses, and in developing, testing, and refining interventions for these diagnoses, and in caring for this population. This book is intended to prepare neuropsychologists and others interested in neuropsychology to serve this fastest growing segment of our population.
The pathophysiological process of Alzheimer's disease (AD) may occur up to two decades before a clinical diagnosis of dementia. By the time a final clinical diagnosis decades before a clinical diagnosis of dementia. By the time a final clinical diagnosis is given, there has already been substantial deterioration within the brain, limiting potentially effective treatment strategies. With advancements in biomarker research and neuropsychological assessments, this "preclinical" phase can be defined as the earliest stage of dementia affording the opportunity for preventative and therapeutic intervention. While these new diagnostic tools provide exciting new implications, there is still much research to be completed to define parameters of cognitive and functional data including the use of biomarkers in the clinical investigative field. It is, therefore; critical to identify the earliest stages of cognitive decline to facilitate the development of new pharmacological approaches to early treatment before significant neuronal loss and multi system degeneration occurs. A review of literature evaluates the latest research on preclinical stages of MCI to include cognitive and functional indicators of those at risk for AD.
Cognitive impairment in the elderly encompasses many forms, ranging from subtle impairments in otherwise cognitively healthy individuals through mild cognitive impairment and dementia. Brain structural and functional changes underlie the observed cognitive impairment. Complementary to the clinical observation, biomarkers have been proposed as in vivo indicators of the underlying pathophysiology and neurobiological changes in a sufficiently reliable manner that they could be used to detect, track, and predict the disease course over time. In this thesis we used a combination of epidemiological and clinic-based approaches to investigate the mechanisms underlying vascular cognitive impairment (VCI) and Alzheimer's disease (AD) and to identify possible biomarkers that could help early diagnosis of such conditions. To do so, a set of circulating and cerebrospinal fluid (CSF) biomarkers were studied in healthy and cognitively impaired subjects. Then, these measures were related to grey matter (GM) volumes, white matter (WM) integrity and cognition. The first two studies are part of the population-based Barcelona-ASIA neuropsychology study. Study I aimed to compare the cognitive patterns of risk markers for cerebrovascular disease (CVD) with the cognitive profile in relation to novel and traditional vascular risk factors (VRF) in a community-dwelling sample. Biomarkers of inflammation, endothelial dysfunction and vascular thrombosis were selected. Results showed that VRF and circulating markers of inflammation and endothelial dysfunction predicted performance in several cognitive domains. Cognitive patterns of inflammatory markers overlapped those related to VRF. Markers of endothelial dysfunction predicted lower performance in verbal memory. Study II was designed to further explore the structural changes mediating the relationships between risk markers of CVD and cognition. For that purpose the same set of markers of risk for CVD were related to GM atrophy and WM integrity and cognition. The main finding was an association of inflammation and vascular thrombosis with WM integrity loss in cortico-subcortical pathways and association fibres of frontal and temporal lobes. As expected, none of the biomarkers was related to GM volume changes. Vascular thrombosis also predicted lower performance in processing speed. The third study is a memory clinic-based investigation that was conducted aiming to test the potential use of CSF biomarkers cut-offs as components for the diagnostic work-up in AD. We assessed GM and cognitive patterns in cognitively impaired subjects using CSF A[beta]1-42, t-tau and p-tau181 cut-offs as grouping criteria. Results indicated that patients with abnormal CSF levels of t-tau and p-tau (but not A[beta]1-42) showed impairment and signs of regional GM atrophy in brain regions characteristic for AD, compared to those with normal levels. More specifically, GM volume differences were found in temporal, inferior parietal, lateral occipital and widespread prefrontal regions. Studies I and II show that risk markers of inflammation and vascular thrombosis are related to a VCI profile for both cognitive patterns and structural brain changes. A microvascular damage of WM projections in fronto-subcortical pathways, but not GM atrophy, could mediate the association between these pathogenic processes and cognitive performance. Markers of endothelial dysfunction are related to a different cognitive pattern which is characteristic of both vascular and neurodegenerative mechanisms. Study III provides evidence that patients with abnormal CSF levels of t-tau and p-tau (but not A[beta]1-42) show cognitive an AD profile according to GM density patterns and cognitive impairment. Taken together, these results suggest that, complementary to the clinical observation, plasma and CSF markers and structural imaging are well placed to improve early diagnosis of both VCI and AD.
Dementia: Comprehensive Principles and Practice is a clinically-oriented book designed for clinicians, scientists, and other health professionals involved in the diagnosis, management, and investigation of disease states causing dementia. A "who's who" of internationally-recognized experts contribute chapters emphasizing a multidisciplinary approach to understanding dementia. The organization of the book takes an integrative approach by providing three major sections that (1) establish the neuroanatomical and cognitive framework underlying disorders of cognition, (2) provide fundamental as well as cutting-edge material covering specific diseases associated with dementia, and (3) discuss approaches to the diagnosis and treatment of dementing illnesses.
It has become accepted in the neuroscience community that perception and performance are quintessentially multisensory by nature. Using the full palette of modern brain imaging and neuroscience methods, The Neural Bases of Multisensory Processes details current understanding in the neural bases for these phenomena as studied across species, stages of development, and clinical statuses. Organized thematically into nine sub-sections, the book is a collection of contributions by leading scientists in the field. Chapters build generally from basic to applied, allowing readers to ascertain how fundamental science informs the clinical and applied sciences. Topics discussed include: Anatomy, essential for understanding the neural substrates of multisensory processing Neurophysiological bases and how multisensory stimuli can dramatically change the encoding processes for sensory information Combinatorial principles and modeling, focusing on efforts to gain a better mechanistic handle on multisensory operations and their network dynamics Development and plasticity Clinical manifestations and how perception and action are affected by altered sensory experience Attention and spatial representations The last sections of the book focus on naturalistic multisensory processes in three separate contexts: motion signals, multisensory contributions to the perception and generation of communication signals, and how the perception of flavor is generated. The text provides a solid introduction for newcomers and a strong overview of the current state of the field for experts.
Alzheimer's disease and related dementias represent an increasing threat to public health, in addition to the stress they place upon patients, their families and caregivers. While historically the emphasis in studying Alzheimer's disease has been on cognitive decline, this unique, state of the art book rectifies this imbalance and addresses the key behavioral and neuropsychiatric disorders associated with dementing conditions. Written by a world famous leader in the field of dementia and neuropsychiatry, this dynamic text has been richly illustrated with graphs, brain imaging and pathology. Rigorously referenced, it is packed with essential information and will be an excellent resource for clinicians as well as an ideal teaching text.
A comprehensive survey of best practice in using diagnostic imaging in acute neurologic conditions. The symptom-based approach guides the choice of the available imaging tools for efficient, accurate, and cost-effective diagnosis. Effective examination algorithms integrate neurological and imaging concepts with the practical demands and constraints of emergency care.