A sudden change in a person’s mental state could be due to delirium. Delirium could lead to increased confusion, disorientation, or difficulty with concentration, and can come on very quickly. It can occur when you are medically unwell and can be caused by infections, pain or dehydration.
It can have a significant impact on the way a person behaves and functions, especially if they also have dementia. Delirium can be very distressing both for the individual and the people who are caring for them.
Delirium and dementia
Delirium is a treatable condition and may co-exist with dementia. However, it is sometimes difficult to recognise in people with dementia, because it has similar symptoms such as confusion and difficulties with thinking and concentration.
Delirium can last for a few days, weeks or even months but it may take longer for people with dementia to recover.
In hospitals, approximately 20 – 30% of older people on medical wards will have delirium, and up to 50% of people with dementia. Between 10 – 50% of people having surgery can develop delirium.
Older people with delirium and dementia have been found to have longer stays in hospital; be at increased risk of complications such as falls, accidents or pressure sores, and be more likely to be admitted into long-term care.
In extreme cases delirium can be fatal, so it’s vital that the person receives treatment as soon as possible.
Symptoms of delirium
There are two types of delirium. People with hyperactive delirium experience increased confusion that fluctuates throughout the day and can feel agitated or restless. People with hypoactive delirium may feel more sleepy and be less responsive.
Other symptoms of delirium include: seeing things that are not there or having vivid dreams that are worse at night; difficulty in focusing attention; and problems with following a conversation.
People who have had delirium say they:
felt unsure of their whereabouts
were worried that other people were trying to harm them
felt afraid, irritable, anxious or depressed
felt slow and sleepy
felt agitated and restless
had vivid dreams that continued when they woke up
found it hard to follow what was being said
found it difficult to speak clearly
saw and heard things that were not there
Who is more at risk of delirium?
People with dementia
People who are dehydrated or have a poor appetite
People with an infection (although low level infection may not show up on tests)
People who are constipated or have urine retention
People who have had surgery, particularly hip surgery
Older people taking multiple medications
People with sight and hearing difficulties
People who are nearing the end of their life
People who are in pain
People in an unfamiliar or distressing environmen
In this video our Chief Admiral Nurse and CEO, Hilda Hayo, provide some tips about what delirium is, how you can recognise it, what causes it, and what you can do about it.
What to do
Contact the person’s GP for an urgent assessment and advice. If a GP is unavailable and the confusion or disorientation has come on suddenly, contact the duty doctor who, if necessary, will arrange an ambulance.
How is delirium treated?
The doctor may request blood and urine tests and will be able to decide on appropriate treatment. They may also want to review any medication that could be contributing to the delirium.
There is also evidence that delirium can be prevented by targeting potential causes. You can avoid some of the causes of the confusion, like constipation, dehydration and infection, by ensuring the person stays well hydrated, observes hand hygiene and follows any advice they’re given about wound care and medical devices (such as urinary catheters). If possible, you should also avoid the person moving beds or wards in hospital.
What can I do to help someone with delirium?
If you have contacted the person’s GP and are awaiting treatment, there are a few things you could do to make the situation a little easier for them:
keep calm and reassure the person
use short simple sentences when talking
observe the person to see if they are in any pain
make sure there’s nothing obscuring their senses, and have their glasses and hearing aid to hand if they use them
use familiar photos and objects to distract the person and provide familiarity
help ground the person by making sure they know the time and date
help the person to find the toilet if needed
avoid too much stimulation and having too many people around if possible
keep a low light on at night
avoid disagreeing with the person too much. Change the subject if they express ideas that seem odd to you