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Poor sleep linked to heart failure, Norwegian study says

2013-03-06 05:32:05

By Smitha Mundasad Health reporter, BBC News

People who have trouble drifting off to sleep may be at increased risk of heart

failure, researchers say.

The study, published in the European Heart Journal, followed more than 50,000

people for 11 years.

Scientists found those who suffered several nights of poor sleep were more

likely to develop the condition, in which the heart fails to pump properly.

Experts say further research is needed to see if a lack of sleep causes heart

failure or the link is more complex.

Start Quote

"Luckily many of the things that reduce the chance of heart failure also reduce

insomnia; good diet, exercise, weight loss and not smoking

Dr Tim Chico Univeristy of Sheffield

Scientists at the Norwegian University of Science and Technology looked at more

than 50,000 people aged between 20 and 89. At the beginning of the study, none

of them were known to have heart failure.

In this condition the muscles of the heart are often too out of shape to do

their job properly - they may be too weak or too stiff to pump blood around the

body at the right pressure.

More than 750,000 people in the UK have heart failure and for the majority

there is no cure.

People with the disorder may feel increasingly breathless and exhausted.

And as heart failure worsens, it can be difficult to get a full night's rest -

but the Norwegian study is one of few to investigate whether poor sleepers

without the condition are at risk of getting it in later life.

'Stress hormones'

During the research, the participants were asked whether they had any

difficulties getting to sleep or staying asleep and whether they felt fully

restored after a night's slumber.

People who had trouble falling asleep and remaining asleep each night were

three times more likely to develop heart failure than those who reported no

trouble sleeping.

Those who experienced substandard sleep that failed to leave them fully

refreshed were also at risk.

And this link between a bad night's sleep and heart failure remained true

despite researchers taking smoking, obesity and other well known triggers of

insomnia and heart problems into account.

The researchers say it is unclear exactly why poor sleep and heart failure are

associated in this way.

Dr Laugsand, lead author of the study, said: "We don't know whether insomnia

truly causes heart failure. But if it does, the good thing is it is a

potentially treatable condition.

"So evaluating sleep problems might provide additional information in the

prevention of heart failure."

He suggests the lack of sleep may provoke harmful responses in the body.

Heart Failure

In this condition the heart fails to pump blood around the body effectively.

Most commonly this is due to damage to the muscles of the heart because of:

Heart attacks

High blood pressure

Excessive alcohol

Cardiomyopathies - a group of diseases that affect heart muscle

Some people are born with heart failure

British Heart Foundation

"When you have insomnia your body releases stress hormones which in turn may

effect the heart in a negative way," he said..

The same team of researchers have previously reported a link between people

prone to insomnia and heart attacks.

'Unpleasant condition'

And diabetes, depression and poor brain function have all been linked to

missing restful hours in bed.

Dr Tim Chico, senior clinical lecturer at the University of Sheffield said:

"This is an association study - it links insomnia to heart failure, but does

not prove that insomnia causes heart failure or vice versa. Studies like this

raise interesting suggestions that need further work to examine.

"Insomnia is a very unpleasant condition, but there are effective lifestyle

changes that can reduce it, such as weight loss and exercise.

"Luckily many of the things that reduce the chance of heart failure also reduce

insomnia - good diet, exercise, weight loss and not smoking."

June Davison, senior cardiac nurse at the British Heart Foundation, said: "This

research shows a link between insomnia and your heart, but this doesn't mean

sleepless nights cause heart failure.

"It's well known that getting enough sleep is vital for your mental, physical

and emotional wellbeing.

"Trouble drifting off can be helped by taking a warm bath to relax, or avoiding

caffeine and heavy meals too close to the end of the day.

"If lack of sleep is becoming a problem and affecting your daily life, have a

chat with your GP."