Peter Cheung

Violence in schizophrenia : role of hallucinations and delusions

The study examines the relationship between hallucinations/delusions and violent behaviour in a sample of long-stay inpatients with chronic schizophrenia. Thirty-one subjects defined as violent and meeting DSM-111-R criteria for schizophrenia were compared with 31 matched non-violent schizophrenia patients with respect to detailed phenomenologies of auditory hallucinations using the Mental Health Research Institute Unusual Perceptions Schedule (Carter and Copolov, 1993; Carter et al., 1995) and delusions using the Maudsley Assessment of Delusions Schedule (Taylor et al., 1994). Patients in the violent groups were significantly more likely to experience negative emotions, tone and content related to their voices than those in the non-violent group, whilst patients in the non-violent group were more likely to experience positive emotions, tone and content related to their voices. Patients in the non-violent group were significantly more likely to report success in coping with their voices. There was no association between command hallucinations and violent behaviour. Patients in the violent group were more likely to hold persecutory delusional beliefs than those in the non-violent group, while patients in the non-violent group were likely to hold grandiose delusions than those in the violent group. Patients in the violent group were also more likely to report that the delusion made them feel angry, while those in the non-violent group were more likely to report that the delusion made them feel elated. The results suggest specific aspects of the phenomenologies of hallucinations and delusions that should be clinically assessed to determine the likelihood of violence as a result of such psychotic symptoms.

A Prospective Study of Aggression among Psychiatric Patients in Rehabilitation Wards

Objective: The aim of the study was to determine, among patients in rehabilitation wards, the prevalence and nature of aggressive behaviour and the relationship between aggressive behaviour and patient characteristics and ward factors. Method: The aggressive behaviour of all 220 inpatients within the rehabilitation program of a large psychiatric hospital in Victoria was assessed using the Staff Observation Aggression Scale. Results: Physical assaults occurred at a rate of 97.6 per 100 patients per year. About 40% of all incidents appeared to be unprovoked. Most physical incidents involved use of body parts and use of a weapon was uncommon. Aggression was most often directed at a staff member. Serious injury was rare. Aggressive behaviour was correlated with gender and duration of admission for the whole sample; however, there were different correlates of aggressive behaviour for different ward populations and different types of aggression. As for ward variables, time of day but not patient/staffing level was associated with aggressive behaviour. Conclusions: There was a high rate of aggressive behaviour among patients in rehabilitation wards; this should be taken into consideration in the planning of their community placement. The findings also caution against aggregating different ward populations and types of aggressive behaviour for research.

From long-stay psychiatric hospital to Community Care Unit: evaluation at 1 year

Background: In the context of deinstitutionalisation of psychiatric services, Community Care Units (CCUs) were developed to provide accommodation, clinical care and rehabilitation for patients discharged from the long-stay open wards of a large psychiatric hospital that was in the process of closing. CCUs are 20-bed units built in suburban locations and staffed on a 24-h basis by multidisciplinary clinical teams. Method: An initial group of 125 hospital patients was assessed at 1 month pre-move, 1 month post-move, and again at 1 year, on range of measures covering clinical status, personal functioning, quality of life, residential preferences, aggressive behaviour, and social networks. Staff attitudes, relative and carer perceptions and preferences, and residential environments were also assessed. Results: Most of the transferred patients were still resident in their CCU at 1 year. The clearest result was that patients showed improved quality of life in relation to their living environment. Comparison of the hospital and CCU environments showed that the latter were significantly less restrictive and regimented. Most relatives and carers also preferred the CCU. On average, symptom and disability levels were little changed at 1 year. Conclusions: Our results suggest that the CCU is an appropriate form of service delivery for most long-stay hospital inpatients, but that both more and less supervised settings are also required. While symptoms and disability were little changed at 1 year, it is possible that further follow-up may detect delayed or slow changes. Given the widespread replacement of psychiatric hospitals with community-based services, the future role of the CCU needs to be reviewed.

A prospective study of assaults on staff by psychiatric in-patients.

This study determined the prevalence and features of assaults on staff, compared them with other aggressive incidents by psychiatric in-patients, and studied their relationship with the ward atmosphere. There were 181 physical assaults among 279 staff in two months, i.e. 389 assaults per 100 staff per year. A few patients were responsible for the majority of the assaults. Most assaults were triggered off by staff-patient interaction. About one-third of the staff were significantly psychologically shaken by the incidents. Patients were more likely to be provoked and used more severe means of aggression against staff than against other targets of aggression. There were no significant differences between the characteristics of patients who assaulted staff and those who had other targets of aggression.

Somatisation as a Presentation in Depression and Post-Traumatic Stress Disorder Among Cambodian Refugees

Three Cambodian patients with Depression and Post-traumatic Stress Disorder (PTSD) presenting with somatic complaints are described. Their case histories support previous observations that somatisation is the most common presentation of Cambodian patients with Depression and PTSD. The probable reasons why depressed, traumatised Cambodian patients somatise their psychiatric problems are discussed. These cases illustrate the difficulties involved in engaging such patients in Western style psychotherapy, but show the effectiveness of small doses of antidepressants in treating the depressive and post-traumatic stress symptoms.

Illness Aetiology Constructs, Health Status and Use of Health Services among Cambodians in New Zealand

Objective: The objectives of this study were to determine, among all adult Cambodians living in Dunedin: prevalence of illness aetiology beliefs; psychiatric and physical health status; pattern of use of health services; relationships between use of health services and demographic factors, illness aetiology constructs and health status; and problems encountered and improvements desired in the local health services. Method: 223 (i.e. 93.3% of all) adult Cambodians living in Dunedin were assessed, using a structured interview, in relation to their sociodemographic status, illness aetiology beliefs, physical health status and use of health services. The 28-item version of the General Health Questionnaire was used to assess psychiatric status. Results: Subjects held multiple indigenous and Western illness aetiology constructs. Psychiatric morbidity using the 28item of the General Health Questionnaire (GHQ28) cutoff of 3/4 was 15.7% despite this only six subjects had ever used specialist psychiatric services. Malaria, intestinal parasitic infestations and heart conditions were the three most frequently reported physical problems. Most subjects had used traditional services in Cambodia but very few had used them in New Zealand. Health service was related to duration of stay in New Zealand. Socio-economic status, both physical and psychiatric health status and some illness aetiology constructs. One hundred and forty-two (63.7%) subjects reported problems with use of health services in Dunedin. Conclusion: Despite methodological limitations, some useful preliminary data on factors pertaining to use of and satisfaction with health services among Cambodians were collected. Future research should examine family characteristics and the decision-making processes that determine service use.

Aggressive behaviour and platelet 3H-paroxetine binding in schizophrenia.

Forty schizophrenic patients were included in a study of the relationship between serotonin function as measured by 3H-paroxetine binding to platelet membranes and aggressive behaviour. Patients classified as either aggressive or non-aggressive were paired by age, sex and duration of illness. 3H-Paroxetine binding variations were avoided by taking samples for each pair between 09:00 and 11:00 h, within 4 days of each other, and by assaying pair of samples together. The mean Kd for the aggressive group was 0.193 +/- 0.126 nM and the mean Kd for the non-aggressive group was 0.176 +/- 0.164 nM. The mean Bmax for the aggressive group was 1451 +/- 386 fmol/mg protein while the mean for the non-aggressive group was 1549 +/- 375 fmol/mg protein. There was no significant difference between the groups for either parameter, Kd or Bmax. There were no significant correlations between psychopathology rating including positive and negative symptoms, depression, suicidal thoughts, impulse control, as well as both past and present history of aggression, hostility and irritability traits, psychopathic deviance and either Bmax and Kd. This study finds no relationship between aggressive behaviour and peripheral serotonin function as measured by 3H-paroxetine binding to platelet membranes.

Aggressive behaviour in schizophrenia: role of state versus trait factors

The objective of this article was to elucidate the relative importance of state vs. trait factors in determining aggressive behaviour in schizophrenia. Thirty-one aggressive schizophrenia patients in rehabilitation wards were compared with 31 matched non-aggressive patients with respect to their psychopathology, phenomenologies of hallucinations and delusions, neuroleptic motor side effects, history of aggression and personality traits. Significant differences between the two groups were found in relation to psychopathology, affective responses to hallucinations/delusions, history of aggression and personality traits, but there were no significant differences regarding neuroleptic motor side effects. The effects of history of aggression as well as personality traits were independent of and similar to the total level of psychopathology, but were much smaller when compared to those of negative affective responses to hallucinations/delusions.

Anorexia nervosa and schizophrenia in a male Chinese.

A case of a young male Chinese recent migrant with anorexia nervosa and schizophrenia is presented. The relevant diagnostic issues relating to anorexia nervosa among Chinese males and the nature of the relationship between anorexia nervosa and schizophrenia are discussed.

Studies of aggressive behaviour in schizophrenia: is there a response bias?

Of 73 patients who met selection criteria to enter into a study on aggressive behaviour in schizophrenia, 11 patients (15.1%) did not participate. The participants and non-participants were similar in age, gender ratio and proportion who had aggressive behaviour. The participants, however, had a longer duration of illness, a longer duration of current admission, were more likely to suffer from residual schizophrenia, but less likely to suffer from disorganized schizophrenia and were less severely ill than the non-participants. These results indicate the need, in studies of aggressive behaviour in schizophrenia, to consider non-response bias as a confounding variable.