Vascular Dementia: symptoms and who is affected?
How vascular dementia affects people varies depending on the different underlying causes and more generally from person to person. Symptoms may develop suddenly, for example after a stroke, or more gradually, such as with small vessel disease.
Some symptoms may be similar to those of other types of dementia. Memory loss is common in the early stages of Alzheimer’s, but is not usually the main early symptom of vascular dementia.
The most common cognitive symptoms in the early stages of vascular dementia are:
- problems with planning or organising, making decisions or solving problems
- difficulties following a series of steps (eg cooking a meal)
- slower speed of thought
- problems concentrating, including short periods of sudden confusion.
A person in the early stages of vascular dementia may also have difficulties with:
- memory – problems recalling recent events (often mild)
- language- eg speech may become less fluent
- visuospatial skills- problems perceiving objects in three dimensions.
As well as these cognitive symptoms, it is common for someone with early vascular dementia to experience mood changes, such as apathy, depression or anxiety. Depression is common, partly because people with vascular dementia may be aware of the difficulties the condition is causing. A person with vascular dementia may also become generally more emotional. They may be prone to rapid mood swings and being unusually tearful or happy.
Other symptoms that someone with vascular dementia may experience vary between the different types. Post-stroke dementia will often be accompanied by the obvious physical symptoms of the stroke. Depending on which part of the brain is affected, someone might have paralysis or weakness of a limb. Or if a different part of the brain is damaged they may have problems with vision or speech. With rehabilitation, symptoms may get a little better or stabilise for a time, especially in the first six months after the stroke.
Symptoms of subcortical vascular dementia vary less. Early loss of bladder control is common. The person may also have mild weakness on one side of their body, or become less steady walking and more prone to falls. Other symptoms of subcortical vascular dementia may include clumsiness, lack of facial expression and problems pronouncing words.
Progression and later stages
Over time a person with vascular dementia is likely to develop more severe confusion or disorientation, and further problems with reasoning and communication. Memory loss, for example for recent events or names, will also become worse. The person is likely to need more support with day-to-day activities such as cooking or cleaning.
As vascular dementia progresses, many people also develop behaviours that seem unusual or out of character. The most common include irritability, agitation, aggressive behaviour and a disturbed sleep pattern. Someone may also act in socially inappropriate ways.
Occasionally a person with vascular dementia will strongly believe things that are not true (delusions) or – less often – see things that are not really there (hallucinations). These behaviours can be distressing and a challenge for all involved.
In the later stages of vascular dementia someone may become much less aware of what is happening around them. They may have difficulties walking or eating without help, and become increasingly frail. Eventually, the person will need help with all their daily activities.
How long someone will live with vascular dementia varies greatly from person to person. On average it will be about five years after the symptoms started. The person is most likely to die from a stroke or heart attack.
Who gets vascular dementia?
There are a number of things that can put someone at risk of developing vascular dementia. These are called risk factors. Most of these are things that contribute to underlying cardiovascular diseases. Some of these risk factors (eg lifestyle) can be controlled, but others (eg age and genes) cannot.
Age is the strongest risk factor for vascular dementia. A person’s risk of developing the condition doubles approximately every five years over the age of 65. Vascular dementia under the age of 65 is uncommon and affects fewer than 8,000 people in the UK. Men are at slightly higher risk of developing vascular dementia than women.
A person who has had a stroke, or who has diabetes or heart disease, is approximately twice as likely to develop vascular dementia. Sleep apnoea, a condition where breathing stops for a few seconds or minutes during sleep, is also a possible risk factor. Someone can reduce their risk of dementia by keeping these conditions under control, through taking prescribed medicines (even if they feel well) and following professional advice about their lifestyle.
There is some evidence that a history of depression also increases the risk of vascular dementia. Anyone who thinks they may be depressed should seek their doctor’s advice early.
Cardiovascular disease – and therefore vascular dementia – is linked to high blood pressure, high cholesterol and being overweight in mid-life. Someone can reduce their risk of developing these by having regular check-ups (over the age of 40), by not smoking, and by keeping physically active. It will also help to eat a healthy balanced diet and drink alcohol only in moderation.
Aside from these cardiovascular risk factors, there is good evidence that keeping mentally active throughout life reduces dementia risk. There is some evidence for the benefits of being socially active too.
Researchers think there are some genetic factors behind the common types of vascular dementia, and that these are linked to the underlying cardiovascular diseases. Someone with a family history of stroke, heart disease or diabetes has an increased risk of developing these conditions. Overall, however, the role of genes in the common types of vascular dementia is small.
People from certain ethnic groups are more likely to develop cardiovascular disease and vascular dementia than others. Those from an Indian, Bangladeshi, Pakistani or Sri Lankan background living in the UK have significantly higher rates of stroke, diabetes and heart disease than white Europeans. Among people of African-Caribbean descent, the risk of diabetes and stroke – but not heart disease – is also higher. These differences are thought to be partly inherited but mainly due to lifestyle factors such as diet, smoking and exercise.
Source: Alzheimer’s society UK