Scottish Daily Mail

Blood thinners halve risk of dementia for heart patients

- By Ben Spencer Medical Correspond­ent

COMMON blood thinning drugs can halve the risk of dementia among people with an irregular heartbeat, scientists have found.

A study of 440,000 people found patients who took warfarin and other clot busters were 48 per cent less likely to develop dementia over a decade.

Abnormal heart rhythm, known as atrial fibrillati­on, affects an estimated 900,000 patients. The condition greatly increases the risk of stroke and early death, and patients are also more likely than others to develop dementia. This is thought to be because tiny blood clots form in the head, stopping the flow of oxygen to the brain.

Most people with atrial fibrillati­on are prescribed blood thinners – such as warfarin, edoxaban or rivaroxaba­n – yet many choose not to take the drugs or stop taking them after a few years.

But Swedish experts last night said their discovery might persuade more people to stick with them.

Their findings, published in the European Heart Journal, revealed that those who took blood thinners for the nine years they were followed were 48 per cent less likely to develop dementia than those who never took the drugs.

The researcher­s, from the Karolinska Institute in Stockholm, believe this is because the drugs break down the clots, increasing blood flow to the brain.

Study leader Dr Leif Friberg, associate professor of cardiology at the Karolinska Institute, said: ‘Doctors should not tell their patients to stop using oral anticoagul­ants without a really good reason.

‘If you know that atrial fibrillati­on eats away your brain at a slow but steady pace and that

you can prevent it by staying on treatment, I think most patients would find this a very strong argument for continuing.’

He added: ‘As a clinician I know there are atrial fibrillati­on patients who have a fatalistic view upon stroke. Either it happens or it does not.

‘Few patients are fatalistic about dementia. No brain can withstand a constant bombardmen­t of microscopi­c clots in the long run.’

The researcher­s found many patients with an irregular heartbeat do not stick with the drugs. Some 54 per cent of those they tracked were not taking the anticoagul­ants at the start of the study.

And every year another 10 to 15 per cent stopped taking the treatments.

But he stressed that people without atrial fibrillati­on should not be tempted to take blood thinners – because they can cause severe side effects such as brain haemorrhag­es.

Commenting on the study, Dr Carol Routledge, of Alzheimer’s Research UK, said: ‘The findings highlight a need to investigat­e this link further, but the nature of the study prevents us from firmly concluding that anticoagul­ants reduce the risk of dementia.’

 ??  ?? Tea break: Jean Clark, 86, has a cuppa with the robot at her care home in Lincoln
Tea break: Jean Clark, 86, has a cuppa with the robot at her care home in Lincoln

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