MRI is able to image the structure of the brain, which changes in dementia, to a very high resolution. For example, a characteristic sign of Alzheimer's disease is atrophy (shrinking) of a brain region called the hippocampus. This can easily be seen on an MRI scan and is currently used to aid diagnosis.
Similar to CT scans, MRIs can show whether areas of the brain have atrophied (shrunk). Repeat scans can show how a person's brain changes over time. Evidence of shrinkage may support a diagnosis of Alzheimer's or another neurodegenerative dementia but cannot indicate a specific diagnosis.
Computerised tomography (CT)
CT scans are the most common type of brain scan used in dementia diagnosis. They are useful for ruling out other conditions that cause similar symptoms to dementia and at showing changes to brain structure that occur in diseases like Alzheimer's.
Brain scans cannot identify vascular dementia by themselves, but they can be used along with other information to help confirm the diagnosis. A CT or MRI scan may show evidence of a recent stroke or of other changes in the brain.
Dementia brain scans
These scans may also be used to check for evidence of other possible problems that could explain a person's symptoms, such as a stroke or a brain tumour. An MRI scan is recommended to: help confirm a diagnosis of dementia and the type of disease causing the dementia.
There is no one test to determine if someone has dementia. Doctors diagnose Alzheimer's and other types of dementia based on a careful medical history, a physical examination, laboratory tests, and the characteristic changes in thinking, day-to-day function and behavior associated with each type.
Patient assessment tools:
The GPCOG is a screening tool for cognitive impairment designed for use in primary care and is available in multiple languages. Mini-Cog - The Mini-Cog is a 3-minute test consisting of a recall test for memory and a scored clock-drawing test.
Researchers developed a blood test that could detect Alzheimer's disease-promoting compounds in the blood long before symptoms emerged. The findings may lead to early diagnostic tests for Alzheimer's and other neurodegenerative diseases.
Treatment of Alzheimer's disease and other dementias is typically most effective when started early in the disease process. This includes medications as well as some alternative therapies. Learn more about how to treat dementia.
The five-minute cognitive test (FCT) was designed to capture deficits in five domains of cognitive abilities, including episodic memory, language fluency, time orientation, visuospatial function, and executive function.
Introduction: The five-word test (5WT) is a serial verbal memory test with semantic cuing. It is proposed to rapidly evaluate memory of aging people and has previously shown its sensitivity and its specificity in identifying patients with AD.
For most people with Alzheimer's — those who have the late-onset variety — symptoms first appear in their mid-60s or later. When the disease develops before age 65, it's considered early-onset Alzheimer's, which can begin as early as a person's 30s, although this is rare.
Symptoms of vascular dementia can begin gradually or can occur suddenly, and then progress over time, with possible short periods of improvement. Vascular dementia can occur alone or be a part of a different diagnosis such as Alzheimer's disease or other forms of dementia.
At first, Alzheimer's disease typically destroys neurons and their connections in parts of the brain involved in memory, including the entorhinal cortex and hippocampus. It later affects areas in the cerebral cortex responsible for language, reasoning, and social behavior.
The Self-Administered Gerocognitive Exam, known as SAGE, is a brief, pen-and-paper cognitive assessment tool designed to detect the early signs of cognitive, memory, or thinking impairments. The test evaluates your thinking abilities. This can help your doctors understand how well your brain is functioning.
The Mini-Cog test.
A third test, known as the Mini-Cog, takes 2 to 4 minutes to administer and involves asking patients to recall three words after drawing a picture of a clock. If a patient shows no difficulties recalling the words, it is inferred that he or she does not have dementia.
Many people affected by dementia are concerned that they may inherit or pass on dementia. The majority of dementia is not inherited by children and grandchildren. In rarer types of dementia there may be a strong genetic link, but these are only a tiny proportion of overall cases of dementia.
If you had a crazy day and forgot five things but can still settle into a nice bath or feed yourself well at the end of the day, you're probably experiencing normal forgetfulness. Very poor hygiene or missing meals, on the other hand, is a sign of dementia and a warning sign for Alzheimer's.
Solomon, PhD developed a brief neurocognitive screening battery to identify AD patients. The 7 Minute Screen™ consists of four individual tests (orientation, memory, clock drawing, verbal fluency). The screen can be rapidly administered and scored and therefore may be appropriate for use in the primary care setting.
Neurological Evaluation
People may be asked to name objects, follow verbal and written commands, write a sentence, or draw a complex shape. Doctors may ask you to walk a short distance, because problems with gait can signal other conditions involving memory loss, such as normal pressure hydrocephalus.
The biggest risk factor for dementia is ageing. This means as a person gets older, their risk of developing dementia increases a lot. For people aged between 65 and 69, around 2 in every 100 people have dementia. A person's risk then increases as they age, roughly doubling every five years.