Nurse-led liaison psychiatry service for older adults: service evaluation

recognition of psychosomatic disorders. Liaison psychiatry demands a different set of specialised skills to those required in general adult psychiatry. The liaison psychiatrist must be adept at assessing relevant physical findings in addition to mental state, at engaging individuals with somatic presentations of psychiatric illness and at managing those with psychiatric and physical comorbidity. Such skills may not readily be learned outside of centres which have a welldeveloped specialist liaison service under consultant supervision. Nevertheless, a general adult team can do much to aid a positive attitude in the medical setting towards psychiatry, promote a bio-psychosocial approach to diagnosis, and increase the potential of physicians to treat common psychiatric disorders. Priority should be placed on fostering communication with non-psychiatric colleagues so as to optimise mutual learning.

led consultation liaison service for older adults by retrospectively reviewing all referrals received in 2006 and comparing them against other services and benchmark reports.

CLINICAL IMPLICATIONS
This nurse-led service, using a novel approach of a support worker providing further community support, functions well compared with traditional consultation models.It helps identify many individuals with dementia and engages them into community psychiatric services.
The publication of Who Cares Wins by the Royal College of Psychiatrists (2005) has provided the best available benchmark for the service structure of liaison psychiatry for older adults.The development of specific liaison services is now a priority.Nurse-led consultation for older adult liaison services is gaining popularity.The biggest contribution of liaison nursing teams lies in planning effective discharge, continuity of care and education (Mukaetova-Ladinska, 2006).A randomised controlled trial showed it can be effectively implemented (Baldwin et al, 2004).The efficacy is equivalent to doctor-led consultation models which may have cost-saving implications (Baldwin et al, 2004).
Who Cares Wins states that the multidisciplinary approach has advantages over the consultation method in terms of a more specialist assessment, shortened Flahavan Liaison psychiatry service original papers length of stay, decreased mortality, more mental health reviews and increased compliance with the management plan (Royal College of Psychiatrists, 2005), which has been confirmed through other surveys (Whelan et al, 2007).Despite this, 73% of mental health services in the UK use the traditional sector-based consultation model (Bentley et al, 2003).This evaluation comprehensively reviews, over a 1-year period, all liaison referrals to old age psychiatry services.We are unaware of any studies which comprehensively describe a nurse-led old age liaison service detailing patient demographics and outcomes over a year.

Setting and service
The study was carried out at Wrexham Maelor Hospital, part of the North East Wales National Health Service (NHS) Trust which serves approximately 330 000 people.The liaison service, using a consultation nurse model, has been operating there since 2000.The team was composed of a registered mental nurse band 6, working full time, who assessed all referrals, including those from accident and emergency, with additional input from a healthcare support worker.The nurse also received 1hour weekly supervision from a consultant old age psychiatrist.If required, brief community support by the support worker was possible upon discharge.Referrals were made on standardised forms which included two non-mandatory instruments -the 6-item Cognitive Impairment Test (Brooke & Bullock, 1999) and the 4-item Geriatric Depression Scale (Shah et al, 1999).For individuals presenting with acute confusion, it was expected that the local acute hospital trust protocol for managing delirium had been first tried.
The individuals referred, already open to the community psychiatric team, were not assessed by the liaison service because of the limited capacity of the nurse and to improve continuity of care.Such individuals were seen by their own community psychiatric nurse and were excluded from this study.The previous service used the traditional doctor-led sector-based model, with referrals being assessed by the relevant staff grade doctor or consultant, with limited opportunity for followup or staff and family education because of time constraints.Since the introduction of the liaison service, it is the team's impression that referral rates have not increased, but detection rates have improved for dementia owing to their ability to spend longer assessing each individual.Staff and family satisfaction through improved communication and education have also improved.Patients and carers particularly appreciated the opportunity for brief community follow-up, with fewer requiring a community mental health team referral.

Evaluation
Each standardised referral form was scrutinised for the person's demographics, their type of accommodation, the specialty of the referrer, the reason for admission and the referrer's statement of the presenting problem.The length of stay in hospital prior to referral was also recorded, as was whether assessment tools were used and which psychotropic medications were prescribed on referral.The psychiatric diagnosis, the outcome for assessed individuals, the subsequent discharge accommodation and, if an assessment did not actually occur, why that was so, was obtained from the liaison assessment.
Diagnoses were established using the ICD-10 criteria (World Health Organization, 1992).The data were analysed using Simple Interactive Statistical Analysis (Uitenbroek, 1997); chi-squared tests were used to investigate the significant characteristics of particular groups, with the P-value for statistical significance set at 0.05.Odds ratios were calculated to measure effect size.The team chose groups of individuals for analysis and comparison based on whether it could make an important contribution, namely those with no previous or current psychiatric history, those referred into secondary care and those discharged into care.

Results
Wrexham Maelor Hospital has a 659-bed capacity.It received 24 812 acute admissions in 2006, of which 4906 were for surgery, 4663 for medicine, 2414 for orthopaedics and 2365 for geriatrics.The study identified 298 referrals (the total number for 2006) to psychiatry from the four units, all for people aged over 65 years.Seven of them died prior to being assessed and 13 more died prior to discharge; the mean length of stay prior to referral was 13.7 days.Most referrals were made by nursing staff rather than medical staff.In only 36% of referrals (n=107) had screening instruments been used.A third (69%, n=204) had no previous or current contact with psychiatric services; 95% of those referred and accepted (n=283) were seen within the 3-day policy limit.Basic demographics including gender, age, accommodation type and referral source are described in Table 1 (the reason for admission, the referring problem, previous contact with psychiatric services and psychotropic medications listed on referral are also described).
The outcomes for assessed individuals, including reasons for non-assessment, psychiatric diagnosis, onward referrals and discharge placement, are presented in Table 2.The team's interventions included a one-off assessment in 62% individuals (n=184), with the rest requiring further reviews by the liaison nurse because of the complexity of presentation and risk.All those who received brief community liaison follow-up by the support worker (13%, n=33) also received weekly support during their in-patient stay, as decided by the team according to who needed further emotional support, including carers.The support worker also tended to use community support for those entering into a care home to provide a link between in-patient stay and primary care during the transition period.
For those who saw a staff grade or a consultant psychiatrist during their in-patient admission, this was mainly attributed to diagnostic difficulty, psychotropic medication review, review before admission to the psychiatry ward, challenging capacity assessments, and where the nurse was experiencing undue difficulty in the staff dynamic between psychiatry and the general hospital.At discharge from the team, 27% of individuals (n=65) were referred to secondary care, namely older person's mental health services such as a community mental health team, memory clinic, out-patient clinic and day hospital.(The significance of differences between selected variables is presented in Table 3

Discussion
The service received a large number of referrals for its size, comparable to King's College Hospital, London (336 patients in 2001; Hanlon et al, 2004); this has not changed over the past 5 years.Referrals were more frequent during winter, confirming previous research (Benbow et al, 1998), and may have implications for staffing.The majority of individuals lived independently prior to admission, challenging the stereotyped view of the incapacitated elderly person.There was a reluctance to use the non-mandatory assessment tools before referral and these tended to be used on people with behavioural disturbance or non-adherence.Most individuals were referred from geriatrics, with little referrals from surgery and orthopaedics, in line with previous studies (Bentley et al, 2003).There are noticeable differences in the number of referrals of people aged over 65 years old in medicine (34%), surgery (42%), and elective (72%) and trauma (21%) orthopaedics, and also in numbers of admission per year per specialty with the referral rate per specialty.It is estimated that for one old age psychiatry referral, 16 admissions are made to geriatrics, 18 to medicine, 38 to orthopaedics and 121 to surgery (Boddy et al, 1977; Burley et al, 1979;  Asimakopoulous et al, 1998; Gomberg et al, 1999).
'Acute emergency', confusion, falls and fractures constituted the most common reasons for acute admission.With 69% of those referred having no previous contact with psychiatric services, many elderly individuals present via such acute events.Liaison services have an important role in detecting mental illness and signposting thereafter, which compares well with published data (Ashaye et al, 2006).The most common referring problem was confusion.Other problems included a mood disorder, self-harm, capacity assessment, anxiety and assessment of placement, and compares similarly with other surveys (Rao, 2001;Ashaye et al, 2006).The rate of self-harm (4%) was comparable with that in other services (Gash et al, 2005).Over half of those referred were already prescribed psychotropic medications which tended to be antidepressants.With only five referrals asking for a psychotropic medication review, medication management should become an area for potential service development.
This survey re-affirms the three D's of old age psychiatry -dementia, delirium and depression -and is comparable with Who Cares Wins, with prevalence of 31%, 20% and 29% respectively, and other surveys such as Whelan et al's (2007) with prevalence of 37%, 26% and 24% respectively.For rarer diagnoses (anxiety, psychosis and alcohol dependence) the prevalence was within the ranges in Who Cares Wins, except for alcohol dependence (it was diagnosed in 8% of individuals which may be caused by local patterns of use -Who Cares Wins and other surveys (Whelan et al, 2007) state a range of 1-5%).
Of those referred to a community mental health team, day hospital, memory clinic or out-patient clinic, individuals tended to come from their own home, be diagnosed with dementia and be less likely to receive liaison support worker follow-up owing to their more complex needs requiring a community psychiatric nurse support.For those who returned home without a secondary care referral, brief community liaison support has been used frequently to bridge the gap between inpatient stay and primary care, and to provide postdelirium counselling.Individuals discharged into care were mostly those presenting with acute events such a fracture, fall and delirium.They received brief liaison follow-up only, considering the enhanced support in the care home environment.
The results of our survey are limited by the subjective nature of diagnosis, omitted information on the assessment forms and those patients with psychiatric morbidity not referred.Based on the data collected, the nurse-led consultation service model functions well in comparison with others which mainly use the traditional medically-led consultation model.The service uses a novel approach for post-discharge community support with a healthcare support worker.Being nurse-led, with targeted medical support as needed, the service may be cost-saving.It identifies many individuals with dementia that had no previous contact with psychiatry, and engages them into community services.As referrals from orthopaedics and surgery are improved, it is likely that even more people with dementia would be identified earlier.

Declaration of interest
None.

Table 2 .
Anderson et al Nurse-led liaison psychiatry service for older adults Outcomes for assessed patients

Table 3 .
Characteristics of the variables analysed

Table 1 .
Basic demographics and referral information