Kim T. Mueser

Dual diagnosis: A review of etiological theories

The etiology of the high prevalence of substance use disorders in patients with severe mental illness (schizophrenia or bipolar disorder) is unclear. We review the evidence of different theories of increased comorbidity, organized according to four general models: common factor models, secondary substance use disorder models, secondary psychiatric disorder models, and bidirectional models. Among common factor models, evidence suggests that antisocial personality disorder accounts for some increased comorbidity. Among secondary substance use disorder models, there is support for the supersensitivity model, which posits that biological vulnerability of psychiatric disorders results in sensitivity to small amounts of alcohol and drugs, leading to substance use disorders. There is minimal support for the self-medication model, but the accumulation of multiple risk factors related to mental illness, including dysphoria, may increase the risk of substance use disorder. Secondary psychiatric disorder models remain to be convincingly demonstrated. Bidirectional models have not been systematically examined. Further clarification of etiologic factors, including the identification of subtypes of dual diagnosis, may have implications for developing more effective prevention efforts and treatment.

Empirically Supported Couple and Family Interventions for Marital Distress and Adult Mental Health Problems

This article evaluates the efficacy, effectiveness, and clinical significance of empirically supported couple and family interventions for treating marital distress and individual adult disorders, including anxiety disorders, depression, sexual dysfunctions, alcoholism and problem drinking, and schizophrenia. In addition to consideration of different theoretical approaches to treating these disorders, different ways of including a partner or family in treatment are highlighted: (a) partner-family-assisted interventions, (b) disorder-specific partner-family interventions, and (c) more general couple-family therapy. Findings across diagnostic groups and issues involved in applying efficacy criteria to these populations are discussed.

Assertive Community Treatment for People with Severe Mental Illness Critical Ingredients and Impact on Patients

This article describes the critical ingredients of the assertive community treatment (ACT) model for people with severe mental illness and then reviews the evidence regarding its effectiveness and cost effectiveness. ACT is an intensive mental health program model in which a multidisciplinary team of professionals serves patients who do not readily use clinic-based services, but who are often at high risk for psychiatric hospitalization. Most ACT contacts occur in community settings. ACT teams have a holistic approach to services, helping with medications, housing, finances and everyday problems in living. ACT differs conceptually and empirically from traditional case management approaches.ACT is one of the best-researched mental health treatment models, with 25 randomized controlled trials evaluating its effectiveness. ACT substantially reduces psychiatric hospital use, increases housing stability, and moderately improves symptoms and subjective quality of life. In addition, ACT is highly successful in engaging patients in treatment. Research also suggests that the more closely case management programs follow ACT principles, the better the outcomes.ACT services are costly. However, studies have shown the costs of ACT services to be offset by a reduction in hospital use in patients with a history of extensive hospital use.The ACT model has been hugely influential in the mental health services field. ACT is significant because it offers a clearly defined model, and is clinically appealing to practitioners, financially appealing to administrators and scientifically appealing to researchers.

A review of treatments for people with severe mental illnesses and co-occurring substance use disorders.

Several interventions for people with co-occurring severe mental illnesses and substance use disorders have emerged since the early 1980s. This paper reviews 26 controlled studies of psychosocial interventions published or reported in the last 10 years (1994-2003). Though most studies have methodological weaknesses, the cumulative evidence from experimental and quasi-experimental research supports integrating outpatient mental health and substance abuse treatments into a single, cohesive package. Effective treatments are also individualized to address personal factors and stage of motivation, e.g., engaging people in services, helping them to develop motivation, and helping them to develop skills and supports for recovery. Accumulating evidence from quasi-experimental studies also suggests that integrated residential treatment, especially long-term (one year or more) treatment, is helpful for individuals who do not respond to outpatient dual disorders interventions. Current research aims to refine and test individual components and combinations of integrated treatments.

Cognitive therapy for psychosis in schizophrenia: an effect size analysis

We conducted a meta-analysis using all available controlled treatment outcome studies of cognitive therapy (CT) for psychotic symptoms in schizophrenia. Effect sizes were calculated for seven studies involving 340 subjects. The mean effect size for reduction of psychotic symptoms was 0.65. The findings suggest that cognitive therapy is an effective treatment for patients with schizophrenia who have persistent psychotic symptoms. Follow-up analyses in four studies indicated that patients receiving CT continued to make gains over time (ES=0.93). Further research is needed to determine the replicability of standardized cognitive interventions, to evaluate the clinical significance of cognitive therapy for schizophrenia, and to determine which patients are most likely to benefit from this intervention.

Trauma, PTSD, and the course of severe mental illness: an interactive model

Traumatic life events, as defined by DSM-IV, are common among persons with severe mental illnesses (SMI) such as schizophrenia. Limited evidence suggests concomitantly high rates of posttraumatic stress disorder (PTSD) in this population. However, conceptual models do not exist for understanding the interactions between trauma, PTSD, and SMI. We propose a model, which is an extension of the stress-vulnerability model, in which PTSD is hypothesized to mediate the negative effects of trauma on the course of SMI. Our model posits that PTSD influences psychiatric disorders both directly, through the effects of specific PTSD symptoms including avoidance, overarousal, and re-experiencing the trauma, and indirectly, through the effects of common correlates of PTSD such as retraumatization, substance abuse, and difficulties with interpersonal relationships. We discuss the evidence supporting this model, and consider several intervening variables that are hypothesized to moderate the proposed relationships between PTSD and SMI, including social support, coping and competence, and antisocial personality disorder. Theoretical and clinical implications of the model are considered, as well as several methodological and nosological issues. We conclude with a brief discussion of directions for future research aimed at evaluating components of the model.

Cognitive functioning, symptoms, and work in supported employment: a review and heuristic model

OBJECTIVE Supported employment has been shown to improve the employment outcomes of clients with severe mental illness (SMI), but many clients who receive this service still fail to achieve their vocational goals. There is a need to better understand how illness-related impairments interfere with work, and how supported employment services deal with those impairments in order to improve the employment outcomes of clients with SMI. METHOD We conducted a review of research on the relationship between cognitive functioning, symptoms, and competitive employment in clients with SMI. Based on this review, we developed a heuristic model of supported employment that proposes specific interactions between cognitive factors, symptoms, vocational services, and employment outcomes. RESULTS The review indicated that cognitive functioning and symptoms were strongly related to work in studies of general psychiatric samples. In studies of clients participating in vocational rehabilitation programs, associations between cognitive functioning, symptoms, and work were also present, but were attenuated, suggesting that vocational rehabilitation compensates for the effects of some cognitive impairments and symptoms on work. We describe a heuristic model of supported employment that posits specific and testable effects of cognitive domains and symptoms on vocational services and employment outcomes. CONCLUSIONS Supported employment appears to work by compensating for the effects of cognitive impairment and symptoms on work. The model may serve as a guide for research aimed at understanding how supported employment works, and for developing supplementary strategies designed to improve the effectiveness and cost-effectiveness of supported employment services.

Reliability of reports of violent victimization and posttraumatic stress disorder among men and women with serious mental illness

Although violent victimization is highly prevalent among men and women with serious mental illness (SMI; e.g., schizophrenia, bipolar disorder), future research in this area may be impeded by controversy concerning the ability of individuals with SMI to report traumatic events reliably. This article presents the results of a study exploring the temporal consistency of reports of childhood sexual abuse, adult sexual abuse, and adult physical abuse, as well as current symptoms of posttraumatic stress disorder (PTSD) among 50 people with SMI. Results show that trauma history and PTSD assessments can, for the most part, yield reliable information essential to further research in this area. The study also demonstrates the importance of using a variety of statistical methods to assess the reliability of self-reports of trauma history.

Randomized trial of cognitive-behavioral therapy for chronic posttraumatic stress disorder in adult female survivors of childhood sexual abuse.

The authors conducted a randomized clinical trial of individual psychotherapy for women with posttraumatic stress disorder (PTSD) related to childhood sexual abuse (n = 74), comparing cognitive-behavioral therapy (CBT) with a problem-solving therapy (present-centered therapy; PCT) and to a wait-list (WL). The authors hypothesized that CBT would be more effective than PCT and WL in decreasing PTSD and related symptoms. CBT participants were significantly more likely than PCT participants to no longer meet criteria for a PTSD diagnosis at follow-up assessments. CBT and PCT were superior to WL in decreasing PTSD symptoms and secondary measures. CBT had a significantly greater dropout rate than PCT and WL. Both CBT and PCT were associated with sustained symptom reduction in this sample.

Recent Victimization in Women and Men With Severe Mental Illness: Prevalence and Correlates

The problem of violence against individuals with severe mental illness (SMI) has received relatively little notice, despite several studies suggesting an exceptionally high prevalence of victimization in this population. This paper describes the results of an investigation of the prevalence and correlates of past year physical and sexual assault among a large sample of women and men with SMI drawn from inpatient and outpatient settings across 4 states. Results confirmed preliminary findings of a high prevalence of victimization in this population (with sexual abuse more prevalent for women and physical abuse more prevalent for men), and indicated the existence of a range of correlates of recent victimization, including demographic factors and living circumstances, history of childhood abuse, and psychiatric illness severity and substance abuse. The research and clinical implications of these findings are discussed.