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Dementia is the general name for a decline in cognitive abilities that impacts a person's ability to perform everyday activities. This typically involves problems with memory, thinking, and behavior. Aside from memory impairment and a disruption in thought patterns, the most common symptoms include emotional problems, difficulties with language, and decreased motivation. The symptoms may be described as occurring in a continuum over several stages. Dementia ultimately has a significant effect on the individual, caregivers, and on social relationships in general. A diagnosis of dementia requires the observation of a change from a person's usual mental functioning and a greater cognitive decline than what is caused by normal aging.
Dementia with Lewy bodies (DLB) is a type of dementia characterized by changes in sleep, behavior, cognition, movement, and regulation of automatic bodily functions. Memory loss is not always an early symptom. The disease worsens over time and is usually diagnosed when cognitive impairment interferes with normal daily functioning. Together with Parkinson's disease dementia, DLB is one of the two Lewy body dementias. It is a common form of dementia, but the prevalence is not known accurately and many diagnoses are missed. The disease was first described by Kenji Kosaka in 1976.
Vascular dementia (VaD) is dementia caused by problems in the blood supply to the brain, resulting from a cerebrovascular disease. Restricted blood supply (ischemia) leads to cell and tissue death in the affected region, known as an infarct. The three types of vascular dementia are subcortical vascular dementia, multi-infarct dementia, and stroke related dementia. Subcortical vascular dementia is brought about by damage to the small blood vessels in the brain. Multi-infarct dementia is brought about by a series of mini-strokes where many regions have been affected. The third type is stroke related where more serious damage may result. Such damage leads to varying levels of cognitive decline. When caused by mini-strokes, the decline in cognition is gradual. When due to a stroke, the cognitive decline can be traced back to the event.
Binswanger's disease, also known as subcortical leukoencephalopathy and subcortical arteriosclerotic encephalopathy, is a form of small-vessel vascular dementia caused by damage to the white brain matter. White matter atrophy can be caused by many circumstances including chronic hypertension as well as old age. This disease is characterized by loss of memory and intellectual function and by changes in mood. These changes encompass what are known as executive functions of the brain. It usually presents between 54 and 66 years of age, and the first symptoms are usually mental deterioration or stroke.
Ian John Deary OBE, FBA, FRSE, FMedSci is a Scottish psychiatrist known for work in the fields of intelligence, cognitive ageing, cognitive epidemiology, and personality.
Cognitive reserve is the mind's and brain's resistance to damage of the brain. The mind's resilience is evaluated behaviorally, whereas the neuropathological damage is evaluated histologically, although damage may be estimated using blood-based markers and imaging methods. There are two models that can be used when exploring the concept of "reserve": brain reserve and cognitive reserve. These terms, albeit often used interchangeably in the literature, provide a useful way of discussing the models. Using a computer analogy, brain reserve can be seen as hardware and cognitive reserve as software. All these factors are currently believed to contribute to global reserve. Cognitive reserve is commonly used to refer to both brain and cognitive reserves in the literature.
Lawrence J. Whalley MB, BS, MD, DPM, FRCP(E), FRC Psych was formerly the Crombie Ross Professor of Mental Health in the University of Aberdeen, Scotland, UK from 1992 to 2008. He remains professor emeritus at the University of Aberdeen and from 2010-2020 part-time professor of research at the University of the Highlands and Islands.
Mild cognitive impairment (MCI) is a neurocognitive disorder which involves cognitive impairments beyond those expected based on an individual's age and education but which are not significant enough to interfere with instrumental activities of daily living. MCI may occur as a transitional stage between normal aging and dementia, especially Alzheimer's disease. It includes both memory and non-memory impairments. The cause of the disorder remains unclear, as well as both its prevention and treatment, with some 50 percent of people diagnosed with it going on to develop Alzheimer's disease within five years. The diagnosis can also serve as an early indicator for other types of dementia, although MCI may remain stable or even remit.
The prevention of dementia involves reducing the number of risk factors for the development of dementia, and is a global health priority needing a global response. Initiatives include the establishment of the International Research Network on Dementia Prevention (IRNDP) which aims to link researchers in this field globally, and the establishment of the Global Dementia Observatory a web-based data knowledge and exchange platform, which will collate and disseminate key dementia data from members states. Although there is no cure for dementia, it is well established that modifiable risk factors influence both the likelihood of developing dementia and the age at which it is developed. Dementia can be prevented by reducing the risk factors for vascular disease such as diabetes, high blood pressure, obesity, smoking, physical inactivity and depression. A study concluded that more than a third of dementia cases are theoretically preventable. Among older adults both an unfavorable lifestyle and high genetic risk are independently associated with higher dementia risk. A favorable lifestyle is associated with a lower dementia risk, regardless of genetic risk. In 2020, a study identified 12 modifiable lifestyle factors, and the early treatment of acquired hearing loss was estimated as the most significant of these factors, potentially preventing up to 9% of dementia cases.
Saitohin is a protein that in humans is encoded by the STH gene. This intronless gene encodes for 128 amino acids in an open reading frame. It is located in the human tau gene, in the intron between exons 9 and 10. Also, a single polymorphism of a nucleotide is seen through a change of glutamine residue 7(Q7R) to arginine. It is found to be susceptible to multiple degenerative diseases, however, the exact function of the gene is still unknown.
As populations age, caring for people with dementia has become more common. Elderly caregiving may consist of formal care and informal care. Formal care involves the services of community and medical partners, while informal care involves the support of family, friends, and local communities. In most mild-to-medium cases of dementia, the caregiver is a spouse or an adult child. Over a period of time, more professional care in the form of nursing and other supportive care may be required medically, whether at home or in a long-term care facility. There is evidence to show that case management can improve care for individuals with dementia and the experience of their caregivers. Furthermore, case management may reduce overall costs and institutional care in the medium term. Millions of people living in the United States take care of a friend or family member with Alzheimer’s disease or a related dementia.
Alzheimer's disease (AD) is a neurodegenerative disease that usually starts slowly and progressively worsens, and is the cause of 60–70% of cases of dementia. The most common early symptom is difficulty in remembering recent events. As the disease advances, symptoms can include problems with language, disorientation, mood swings, loss of motivation, self-neglect, and behavioral issues. As a person's condition declines, they often withdraw from family and society. Gradually, bodily functions are lost, ultimately leading to death. Although the speed of progression can vary, the typical life expectancy following diagnosis is three to nine years.
Hirano bodies are intracellular aggregates of actin and actin-associated proteins first observed in neurons by Asao Hirano in 1965. The eponym ‘Hirano bodies’ was not introduced until 1968, by Schochet et al., three years after Hirano first observed the proteins.
The Mediterranean-DASH Intervention for Neurodegenerative Delay diet, or more commonly, the MIND diet, combines portions of the DASH diet and the Mediterranean diet. Both the DASH diet and the Mediterranean diet have been shown to improve cognition; however, neither were developed to slow neurodegeneration. Therefore, a team at Rush University Medical Center, headed by Martha Clare Morris, worked to create the MIND diet. Like the DASH and Mediterranean diets, the MIND diet emphasizes the intake of fresh fruit, vegetables, and legumes. The MIND diet also includes recommendations for specific foods, like leafy greens and berries, that have been scientifically shown to slow cognitive decline. Recent research has shown that the MIND diet may be more effective at reducing cognitive decline than either the Mediterranean or DASH diets alone, though a cause and effect relationship has yet to be determined. Additional testing has shown that the level of adherence to the MIND diet also impacts the diet's neuro-protective effects.
The Rush Alzheimer's Disease Center (RADC) is an independent research center located in the Medical College of Rush University Medical Center. The Rush Alzheimer's Disease Center is one of the Alzheimer's Disease Research Centers in the U.S. designated and funded by the National Institute on Aging.
Czech Brain Ageing Study (CBAS) is a longitudinal, observational study on aging and dementia from two large centers in the Czech Republic combining clinical care and clinical research.
Miia K. Kivipelto is a Finnish neuroscientist and professor at the University of Eastern Finland and Karolinska Institute in Stockholm. Her research focuses on dementia and Alzheimer's disease.
LATE is a term that describes a prevalent condition with impaired memory and thinking in advanced age, often culminating in the dementia clinical syndrome. In other words, the symptoms of LATE are similar to those of Alzheimer's disease.
The Women's Healthy Ageing Project (WHAP) is the longest ongoing medical research project examining the health of Australian women. Its landmark studies concern women's heart and brain health, a long-neglected area of specialised research.
Cassandra Szoeke is an Australian medical researcher and practicing physician in internal medicine, with a sub-specialisation in neurology.
References
- 1 2 "Awards for Wellcome community in Queen's Birthday Honours". Wellcome. 19 June 2017. Retrieved 28 June 2017.
- 1 2 "Professor Carol Brayne – Department of Public Health and Primary Care". Phpc.cam.ac.uk. Retrieved 28 June 2017.
- ↑ "Professor Carol Brayne CBE". Department of Public Health and Primary Care. Retrieved 5 January 2022.
- ↑ "Cambridge scientists among those honoured by Queen | Anglia – ITV News". Itv.com. 16 June 2017. Retrieved 28 June 2017.
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