Progress in Neurology and Psychiatry 20C hallenging behaviour is a term that has been adapted from the field of learning disability, 1 and incorporates other terms used previously such as behavioural disturbance, problematic behaviours, behavioural problems and difficult behaviour. The concept takes into account the intrinsic and extrinsic factors involved in the aetiology. 2 Challenging behaviour puts a strain on caregivers and reduces quality of life of ser vice users and staff, leading to transfer between care setting, institutionalisation, referral to psychiatric services and admission to hospital. 3 Challenging behaviour can occur with any mental health problem but is most common and demanding in dementia. The term behavioural and psychological symptoms of dementia (BPSD) is linked to challenging behaviour, as these symptoms often result in challenging behaviour. For the purpose of this article, challenging behaviour and BPSD are used interchangeably and the focus is on dementia, although most of the principles apply generally.
Size of the problemThe prevalence of BPSD varies depending on the situation, eg community, care home or hospital, how the symptoms are measured and the severity of dementia. Dementia is a syndrome caused by number of illnesses in which there is a progressive decline in cognitive function and the ability to carry out activities of daily living. There are about 700 000 people with dementia in the UK. BPSD is a strong predictor of carer distress, 4 entry into social care, 5 and is associated with impaired functional ability, poorer prognosis and caregiver burden. It also makes discharge from hospital more difficult. 6 BPSD affects up to 95 per cent of people with dementia at some point. 7 BPSD fall into three main groups: agitation, psychosis and mood disorder. 5 They increase in frequency and severity as the dementia progresses and become evident in the moderately severe stage of dementia when people are beginning to lose an awareness of their disability. Symptoms include delusions, hallucinations, anxiety, depression, apathy, agitation, misidentification and disinhibition, possibly together with behaviours such as calling out/shouting, repetitive questioning, inappropriate incontinence, sexually inappropriate behaviour, wandering and aggression. 7,8 Understanding challenging behaviour Challenging behaviour has been defined as an active attempt by the person to express an unmet need, which could be physiological or psychological. 8 It can be a manifestation of distress or suffering, or a reaction to distress in the carer, which may in turn increase the behavioural problems. 9 Before any treatment can be formulated, the challenging behaviour needs to be understood, and for this, a person-centred approach is essential. 10 This means that the behaviour needs to be understood on the basis of the function it serves for that individual and the reasons behind it. Rather than see challenging behaviour as a problem it should be seen as a method of communication: what is the person trying to tel...