People have the right to be involved in discussions and make informed decisions about their care, as described in NICE's information on making decisions about your care.

Making decisions using NICE guidelines explains how we use words to show the strength (or certainty) of our recommendations, and has information about prescribing medicines (including off-label use), professional guidelines, standards and laws (including on consent and mental capacity), and safeguarding.

The following guidance is based on the best available evidence. The full guideline gives details of the methods and the evidence used to develop the guidance.

The Guideline Development Group used the following definitions in this guideline.

  • Hyperactive delirium: a subtype of delirium characterised by people who have heightened arousal and can be restless, agitated or aggressive.

  • Hypoactive delirium: a subtype of delirium characterised by people who become withdrawn, quiet and sleepy.

  • Multidisciplinary team: a team of healthcare professionals with the different clinical skills needed to offer holistic care to people with complex problems such as delirium.

  • Long-term care: residential care in a home that may include skilled nursing care and help with everyday activities. This includes nursing homes and residential homes.

Think delirium

Be aware that people in hospital or long-term care may be at risk of delirium. This can have serious consequences (such as increased risk of dementia and/or death) and, for people in hospital, may increase their length of stay in hospital and their risk of new admission to long-term care. For recommendations on delirium in palliative care, see the NICE guideline on care of dying adults in the last days of life.

1.1 Risk factor assessment

1.1.1 When people first present to hospital or long-term care, assess them for the following risk factors. If any of these risk factors is present, the person is at risk of delirium.

  • Age 65 years or older.

  • Cognitive impairment (past or present) and/or dementia (for guidance on diagnosing dementia, see diagnosis in the NICE guideline on dementia). If cognitive impairment is suspected, confirm it using a standardised and validated cognitive impairment measure.

  • Current hip fracture.

  • Severe illness (a clinical condition that is deteriorating or is at risk of deterioration; for further information on recognising and responding to acute illness in adults in hospital, see the NICE guideline on acutely ill adults in hospital).

1.1.2 Observe people at every opportunity for any changes in the risk factors for delirium.

1.2 Indicators of delirium: at presentation

1.2.1 At presentation, assess people at risk for recent (within hours or days) changes or fluctuations in behaviour. These may be reported by the person at risk, or a carer or relative. Be particularly vigilant for behaviour indicating hypoactive delirium (marked*). These behaviour changes may affect:

  • Cognitive function: for example, worsened concentration*, slow responses*, confusion.

  • Perception: for example, visual or auditory hallucinations.

  • Physical function: for example, reduced mobility*, reduced movement*, restlessness, agitation, changes in appetite*, sleep disturbance.

  • Social behaviour: for example, lack of cooperation with reasonable requests, withdrawal*, or alterations in communication, mood and/or attitude.

    If any of these behaviour changes are present, a healthcare professional who is trained and competent in diagnosing delirium should carry out a clinical assessment to confirm the diagnosis.

1.3 Interventions to prevent delirium

1.3.1 Ensure that people at risk of delirium are cared for by a team of healthcare professionals who are familiar to the person at risk. Avoid moving people within and between wards or rooms unless absolutely necessary.

1.3.2 Give a tailored multicomponent intervention package:

  • Within 24 hours of admission, assess people at risk for clinical factors contributing to delirium.

  • Based on the results of this assessment, provide a multicomponent intervention tailored to the person's individual needs and care setting as described in recommendations–

1.3.3 The tailored multicomponent intervention package should be delivered by a multidisciplinary team trained and competent in delirium prevention. Address cognitive impairment and/or disorientation by:

  • providing appropriate lighting and clear signage; a clock (consider providing a 24-hour clock in critical care) and a calendar should also be easily visible to the person at risk

  • talking to the person to reorientate them by explaining where they are, who they are, and what your role is

  • introducing cognitively stimulating activities (for example, reminiscence)

  • facilitating regular visits from family and friends. Address dehydration and/or constipation by:

  • ensuring adequate fluid intake to prevent dehydration by encouraging the person to drink – consider offering subcutaneous or intravenous fluids if necessary

  • taking advice if necessary when managing fluid balance in people with comorbidities (for example, heart failure or chronic kidney disease). Assess for hypoxia and optimise oxygen saturation if necessary, as clinically appropriate. Address infection by: Address immobility or limited mobility through the following actions:

  • Encourage people to:

    • mobilise soon after surgery

    • walk (provide appropriate walking aids if needed – these should be accessible at all times).

  • Encourage all people, including those unable to walk, to carry out active range-of-motion exercises. Address pain by:

  • assessing for pain

  • looking for non-verbal signs of pain, particularly in those with communication difficulties (for example, people with learning difficulties or dementia, or people on a ventilator or who have a tracheostomy)

  • starting and reviewing appropriate pain management in any person in whom pain is identified or suspected. Carry out a medication review for people taking multiple drugs, taking into account both the type and number of medications. For information on medicines optimisation see the NICE guideline on medicines optimisation. Address poor nutrition by: Address sensory impairment by:

  • resolving any reversible cause of the impairment, such as impacted ear wax

  • ensuring hearing and visual aids are available to and used by people who need them, and that they are in good working order. Promote good sleep patterns and sleep hygiene by:

  • avoiding nursing or medical procedures during sleeping hours, if possible

  • scheduling medication rounds to avoid disturbing sleep

  • reducing noise to a minimum during sleep periods.

1.4 Indicators of delirium: daily observations

1.4.1 Observe, at least daily, all people in hospital or long-term care for recent (within hours or days) changes or fluctuations in usual behaviour (see recommendation 1.2.1). These may be reported by the person at risk, or a carer or relative. If any of these behaviour changes is present, a healthcare professional who is trained and competent in the diagnosis of delirium should carry out a clinical assessment to confirm the diagnosis.

1.5 Diagnosis (specialist clinical assessment)

1.5.1 If indicators of delirium are identified, carry out a clinical assessment based on the Diagnostic and Statistical Manual of Mental Disorders (DSM-V) criteria or short Confusion Assessment Method (short CAM) to confirm the diagnosis. In critical care or in the recovery room after surgery, CAM‑ICU should be used. A healthcare professional who is trained and competent in the diagnosis of delirium should carry out the assessment. If there is difficulty distinguishing between the diagnoses of delirium, dementia or delirium superimposed on dementia, treat for delirium first.

1.5.2 Ensure that the diagnosis of delirium is documented both in the person's hospital record and in their primary care health record.

1.6 Treating delirium

Initial management

1.6.1 In people diagnosed with delirium, identify and manage the possible underlying cause or combination of causes.

1.6.2 Ensure effective communication and reorientation (for example explaining where the person is, who they are, and what your role is) and provide reassurance for people diagnosed with delirium. Consider involving family, friends and carers to help with this. Provide a suitable care environment (see recommendation 1.3.1).

Distressed people

1.6.3 If a person with delirium is distressed or considered a risk to themselves or others, first use verbal and non-verbal techniques to de-escalate the situation. For more information on de-escalation techniques, see the NICE guideline on violence and aggression. Distress may be less evident in people with hypoactive delirium, who can still become distressed by, for example, psychotic symptoms.

1.6.4 If a person with delirium is distressed or considered a risk to themselves or others and verbal and non-verbal de-escalation techniques are ineffective or inappropriate, consider giving short-term haloperidol (usually for 1 week or less). Start at the lowest clinically appropriate dose and titrate cautiously according to symptoms. Take into account the MHRA advice about the risks of using haloperidol for the acute treatment of delirium in older people, including the risks of cardiac and neurological side effects (especially in people living with Parkinson's disease or dementia with Lewy bodies).

1.6.5 This recommendation has been replaced by the update of recommendation 1.6.4.

If delirium does not resolve

1.6.6 For people in whom delirium does not resolve:

1.7 Information and support

1.7.1 Offer information to people who are at risk of delirium or who have delirium, and their family and/or carers, which:

  • informs them that delirium is common and usually temporary

  • describes people's experience of delirium

  • encourages people at risk and their families and/or carers to tell their healthcare team about any sudden changes or fluctuations in behaviour

  • encourages the person who has had delirium to share their experience of delirium with the healthcare professional during recovery

  • advises the person of any support groups.

1.7.2 Ensure that information provided meets the cultural, cognitive and language needs of the person.

  • National Institute for Health and Care Excellence (NICE)