A simple five-minute neck scan could be used to spot dementia in people around a decade before symptoms start to show, new research suggests.
The scan of blood vessels – which predicts cognitive decline 10 years before symptoms appear – could become part of routine screening for people at risk of developing dementia, if it can be proven in further studies.
Researchers said as the heart beats, it generates a physical pulse that travels around the body. Healthy, elastic vessels near the heart usually diminish the energy carried by this pulse by cushioning each heartbeat, preventing the pulse from reaching delicate blood vessels elsewhere in the body.
Factors such as ageing and high blood pressure cause stiffening of these blood vessels, however, and may diminish their protective effect. As a result, a progressively stronger pulse can travel deep into the fragile vessels which supply the brain.
Over time, this can cause damage to the small vessels of the brain, structural changes in the brain’s blood vessel network and minor bleeds known as mini strokes, which may contribute to the development of dementia.
The team analysed a group of more than 3,000 middle-aged volunteers who were given an ultrasound in 2002, which measured the intensity of the pulse travelling towards their brain. Over the next 15 years, researchers monitored the participant’s memory and problem-solving ability.
Participants with the highest intensity pulse (top 25%) at the beginning of the study were around 50% more likely to exhibit accelerated cognitive decline over the next decade compared to the rest of the participants.
This difference was present even after adjustments for possible confounding factors, such as age, body mass index (BMI), blood pressure and diabetes, and whether participants had other heart conditions.
Cognitive decline is often one of the first signs of dementia, but not everyone who shows signs of cognitive decline will go on to develop dementia.
The team now plan to use MRI scans to check if these individuals also display structural and functional changes within the brain which may explain the changes in cognitive abilities. They also plan to test whether the scan improves predictive “risk scores” for dementia which already exist.
Dementia affects around 850,000 people in the UK. Vascular dementia is one of the most common types, caused by a problem with blood supply to the brain which damages or kills brain cells.
Research suggests that controlling blood pressure and cholesterol, having a healthy diet, regular exercise and not smoking can all help to stave off dementia.
The research, which is being presented at the American Heart Association Scientific Sessions conference in Chicago, was led by University College London (UCL).