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Home Lifestyle

Confusion ‘is a major symptom of Covid-19 in frail older people’

souhaib by souhaib
September 30, 2020
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Suddenly feeling confused and delirious is a common symptom of Covid-19 among frail older people, scientists have found.

Officials in the UK don’t recognise any symptoms other than coughing, fever and a lost sense of taste or smell, but there are many others that people suffer regularly.

Experts who run the Covid Symptom Tracker app, from King’s College London, have now found that large proportions of elderly people get delirious when they’re ill.

Delirium is a state that comes on suddenly in which people get confused, struggle to think clearly and may hallucinate, become agitated or have mood swings. 

The condition is caused by problems in the brain and can make people more likely to get seriously ill or die in hospital because their bodies become generally weaker and less able to recover, and the effects on the brain can be long-lasting or permanent.

Using self-reported symptoms from around 850 over-65s, the King’s researchers found people official considered ‘frail’ were three times as likely to become delirious. 

And of over-65s who ended up in hospital because of Covid-19, one in five (18.9 per cent) said delirium was their only symptom.

The researchers said the coronavirus may be able to get into the brain and infect it, affecting someone’s mental state. And delirium can also be caused by high levels of white blood cells in the brain or by fever, a separate symptom of Covid-19.

Frail people – the elderly and those with long-term illnesses – are the most likely to die of Covid-19 if they catch it, so understanding how it affects them is critical, scientists say (Pictured: An elderly woman with Covid-19 in Italy in April)

This graphic, based on a study by Public Health England, shows which symptoms are most common among people with Covid-19 and how they compare to signs of cold and flu

This graphic, based on a study by Public Health England, shows which symptoms are most common among people with Covid-19 and how they compare to signs of cold and flu 

Dr Rose Penfold, an epidemiologist at King’s, said: ‘Older, frailer people are at greater risk from Covid-19 than those who are fitter, and our results show that delirium is a key symptom in this group. 

‘Doctors and carers should watch out for any changes in mental state in elderly people, such as confusion or strange behaviour, and be alert to the fact that this could be an early sign of coronavirus infection.’

Although delirium can cause similar symptoms to dementia or simply age-related brain decline, it usually comes on quickly and makes a noticeable difference. 

It may happen in people who are otherwise mentally healthy, or worsen problems in people who already have them.

The team looked at data from 322 older people who were admitted to hospital with coronavirus between March and May, and also at 535 people who tested positive and used the Covid Symptom Tracker app during the same time period.

WHAT ARE THE REAL SYMPTOMS OF CORONAVIRUS?

Authorities in the UK recognise only three major symptoms of Covid-19: a new cough, a fever, or a lost or changed sense of taste or smell.

Cough and fever have been top of the list since the virus was discovered, because they are the most common signs among people who become seriously ill and end up in hospital.

The lost or changed sense of smell was added to the list in May after months of clamouring from nose and throat doctors. This was only added because it was so specific – people do not often experience it from other common illnesses.

However, Britain’s list of symptoms is far from exhaustive.

Officials have been criticised for not including a wider range of symptoms that are known to be caused by Covid-19.

The Centers for Disease Control and Prevention in the US, for example, lists 11 symptoms and admits that isn’t even all of them. Those used in the US are:

  • Fever or chills
  • Cough
  • Shortness of breath or difficulty breathing
  • Fatigue
  • Muscle or body aches
  • Headache
  • New loss of taste or smell
  • Sore throat
  • Congestion or runny nose
  • Nausea or vomiting
  • Diarrhoea

Other less common symptoms can include ‘Covid toe’, in which the feet become discoloured or develop lesions, or eye problems that make people’s eyes swell up or water excessively. 

A study in Northern Ireland found that gut problems, including diarrhoea and vomiting, were a more accurate predictor of Covid-19 among children than coughing.

But authorities have to choose symptoms by treading a line between those that are almost always present in Covid-19, and those that are caused by coronavirus but are more often caused by something else.

For example, the majority of people with diarrhoea or tiredness likely have a stomach bug or a cold than coronavirus, meaning testing all of them for Covid-19 would be a waste of time and money.  

App users are able to report the symptoms of a friend or family member, meaning the delirious people did not have to report for themselves in every case.

As well as considering the symptoms the over-65s reported – or had reported for them – the scientists looked at how frail they were.

This was done using a questionnaire for the app users or came from a standardised rating made by a doctor for patients who were in hospital.

People considered to be frail may be those who are physically weak, disabled, in poor health, or have brain damage such as that caused by dementia. 

Most people living in care homes are considered frail, and they are also the group most at risk of dying if they catch coronavirus, which makes understanding the most common symptoms in that group important. 

Frail people with Covid-19 were more likely to have delirium, tiredness and breathlessness than those who were the same age but stronger, the study found.

A third of people who reported having delirium on the app said they did not have the classic Covid-19 symptoms of coughing and fever.

Among the frail patients, 38 per cent had delirium, compared to just 12 per cent of the non-frail patients in the same age group, meaning it was three times more common.

The study found there were no significant differences in the rates of other common symptoms such as coughs or fevers between frail and non-frail groups.  

Dr Claire Steves, a geriatrician in London and a lecturer at King’s College, said: ‘The past six months have shown us that Covid-19 can spread catastrophically through care homes. 

‘Knowing that delirium is a symptom in frail, elderly people will help families and carers spot the signs earlier of Covid-19 and act appropriately and put in place infection control measures such as isolation, increased hygiene and personal protective equipment to protect this highly vulnerable group.’

The study, published in the journal Age and Ageing, adds to emerging evidence that the symptoms people experience when they catch coronavirus vary by age.

While middle-aged and older people – the group most likely to be admitted to hospital – often have the tell-tale cough or fever, others have them less often.

Young adults appear to often have no symptoms at all or to have just a mild flu-like illness. 

And a study done in Northern Ireland found that children often have no symptoms, but among those that do, vomiting, diarrhoea and stomach pain were some of the most common.

They said that coughs were much less common in children with the illness and that problems with the gut were a stronger indicator of whether they had coronavirus.

Dr Tom Waterfield at Queen’s University Belfast told the BBC: ‘We are finding that diarrhoea and vomiting is a symptom reported by some children and I think adding it to the list of known symptoms is worth considering.’

Dr Waterfield and colleagues studied 992 children, of whom 68 had coronavirus. They had an average age of 10 years old.

Counting gastrointestinal symptoms – those affecting the stomach and bowels – would have significantly improved how many of the children could be diagnosed.



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