Preference for and effects of variable-as opposed to fixed-reinforcer duration

Pigeons were trained on multiple schedules in which a fixed number of pecks produced either a fixed or a variable period of access to food, the average variable-duration reinforcement equalling the fixed. Pecking rates were generally higher during the variable-duration component. Subsequent performance on concurrent schedules revealed an initial preference for variable-duration reinforcement for all subjects; for most subjects, this preference was sustained. For one subject, the average variable duration was gradually reduced to half the fixed duration: continued preference for the variable component resulted in a loss of up to 30% of available reinforcement time. A return to multiple schedules with unequal pay-off shifted the preference to the greater fixed duration, and this preference was maintained even when the variable duration was again raised to equal the fixed duration. For the remaining subjects, the initial variable-duration preference on concurrent schedules was gradually replaced by a side preference. When the range of variable durations was varied, keeping the average variable duration equal to the fixed, the occasional longer reinforcers sustained a preference for variable-reinforcer durations for three of the four subjects.

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.

The effects of cognitive impairment and substance abuse on psychiatric hospitalizations

Previous studies have demonstrated a relationship between impairment in executive functioning and hospital and community tenure for people with schizophrenia. However, while it has been clearly established that comorbid substance abuse has a profound negative impact on the functioning of people with schizophrenia, no studies have examined the relative effect of cognitive impairment to substance use in predicting rehospitalization in this population. The present study examined the extent to which impairment on the Wisconsin Card Sorting Test (WCST) and substance abuse are correlated with lifetime psychiatric hospitalizations for outpatients with schizophrenia. Substance abuse was a significant predictor of prior hospitalizations and impairment on the WCST was a significant predictor of the months hospitalized. The findings suggest that both substance abuse and cognitive impairment need to be addressed in order to reduce hospitalizations and time in the hospital.

Evidence-based pharmacologic treatment for people with severe mental illness: a focus on guidelines and algorithms

Medication treatment of severe mental illness has been advanced and complicated by the introduction of numerous therapeutic agents. Practice guidelines based on research evidence have been developed to help clinicians make complex decisions. Studies of usual care suggest an important potential role for guidelines in improving the quality of medication treatment for people with severe mental illness. The authors review current evidence-based guidelines for medication treatment of persons with severe mental illness. Four categories of guidelines are described: recommendations, comprehensive treatment options, medication algorithms, and expert consensus. The authors note that more research is needed on optimal next-step strategies and the treatment of patients with comorbidity and other complicating problems. They discuss barriers to the implementation of guidelines, and they observe that the potential of guidelines and algorithms to promote evidence-based medication treatment for persons with severe mental illness depends on refinement of tools, progress in research, and cooperation of physicians, nonphysician clinicians, administrators, and consumers and family members.

Implementing dual diagnosis services for clients with severe mental illness

After 20 years of development and research, dual diagnosis services for clients with severe mental illness are emerging as an evidence-based practice. Effective dual diagnosis programs combine mental health and substance abuse interventions that are tailored for the complex needs of clients with comorbid disorders. The authors describe the critical components of effective programs, which include a comprehensive, long-term, staged approach to recovery; assertive outreach; motivational interventions; provision of help to clients in acquiring skills and supports to manage both illnesses and to pursue functional goals; and cultural sensitivity and competence. Many state mental health systems are implementing dual diagnosis services, but high-quality services are rare. The authors provide an overview of the numerous barriers to implementation and describe implementation strategies to overcome the barriers. Current approaches to implementing dual diagnosis programs involve organizational and financing changes at the policy level, clarity of program mission with structural changes to support dual diagnosis services, training and supervision for clinicians, and dissemination of accurate information to consumers and families to support understanding, demand, and advocacy.

Rural and urban differences in patients with a dual diagnosis

OBJECTIVES

To evaluate the differences between two cohorts of patients with severe mental illness (schizophrenia-spectrum or bipolar disorder) and co-occurring substance-use disorders, living in either predominantly rural areas or urban areas.

METHODS

Two study groups of patients with a dual diagnosis, recruited using the same criteria, were evaluated, including 225 patients from New Hampshire and 166 patients from two cities in Connecticut. The two study groups were compared on demographic characteristics, housing, legal problems, psychiatric and substance use diagnoses, substance use and abuse, psychiatric symptoms, and quality of life.

RESULTS

Patients in the Connecticut study group had higher rates of cocaine-use disorder, more involvement in the criminal justice system, more homelessness, and were more likely to be from minority backgrounds. The Connecticut group also had a higher proportion of patients with schizophrenia and more severe symptoms, as well as lower rates of marriage, educational attainment, and work than the New Hampshire study group. Alcohol-use disorder was higher in the New Hampshire group. Subsequent analyses within the Connecticut group indicated that although African American patients had higher rates of cocaine-use disorder than white patients, cocaine disorder and not minority status was most strongly related to criminal involvement and homelessness.

CONCLUSIONS

Because of the substances abused and the greater degree of psychiatric illness severity, patients with a dual diagnosis who are living in urban areas may require greater ancillary services, such as residential programs, Assertive Community Treatment, and jail diversion programs in order to treat their disorders successfully.

Prevalence of HIV, hepatitis B, and hepatitis C in people with severe mental illness

OBJECTIVES

This study assessed seroprevalence rates of HIV, hepatitis B virus (HBV), and hepatitis C virus (HCV) among individuals with severe mental illness.

METHODS

Participants (n = 931) were patients undergoing inpatient or outpatient treatment in Connecticut, Maryland, New Hampshire, or North Carolina.

RESULTS

The prevalence of HIV infection in this sample (3.1%) was approximately 8 times the estimated US population rate but lower than rates reported in previous studies of people with severe mental illness. Prevalence rates of HBV (23.4%) and HCV (19.6%) were approximately 5 and 11 times the overall estimated population rates for these infections, respectively.

CONCLUSIONS

Elevated rates of HIV, HBV, and HCV were found. Of particular concern are the high rates of HCV infection, which are frequently undetected. Individuals with HCV infection commonly fail to receive appropriate treatment to limit liver damage and unknowingly may be a source of infection to others.

Cost-effectiveness of clozapine compared with conventional antipsychotic medication for patients in state hospitals

BACKGROUND

An open-label, randomized controlled trial compared clozapine with physicians'-choice medications among long-term state hospital inpatients in Connecticut. The goal was to examine clozapine's cost-effectiveness in routine practice for people experiencing lengthy hospitalizations.

METHODS

Long-stay patients with schizophrenia in a state hospital were randomly assigned to begin open-label clozapine (n = 138) or to continue receiving conventional antipsychotic medications (n = 89). We interviewed study participants every 4 months for 2 years to assess psychiatric symptoms and functional status, and we collected continuous measures of prescribed medications, service utilization, and other costs. We used both parametric and nonparametric techniques to examine changes in cost and parametric analyses to examine changes in effectiveness. We used bootstrap techniques to estimate incremental cost-effectiveness ratios and create cost-effectiveness acceptability curves.

RESULTS

Both groups incurred similar costs during the 2-year study period, with a trend for clozapine to be less costly than usual care in the second study year. Clozapine was more effective than usual care on many but not all measures. With the use of effectiveness measures that favored clozapine (extrapyramidal side effects, disruptiveness), bootstrap techniques indicated that, even when a payer is unwilling to incur any additional cost for gains in effectiveness, the probability that clozapine is more cost-effective than usual care is at least 0.80. These findings were not as evident when outcomes where clozapine was not clearly superior (psychotic symptoms, weight gain) were examined.

CONCLUSION

Clozapine demonstrated cost-effectiveness on some but not all measures of effectiveness when the alternative was a range of conventional antipsychotic medications.

Data and decisions: can mental health management be knowledge-based?

Three major factors suggest a healthy future for data-based decision making within mental health authorities: (1) the improved knowledge base related to the treatment and management of serious mental illness, (2) advances in data-processing technology and (3) conceptual advances in management information system design, most notably the National Institute of Mental Health (NIMH) Mental Health Statistics Improvement Package. This paper briefly outlines these three factors and goes on to examine information needed by state mental health authorities (SMHAs) to enhance decision making. The client-level data necessary for data-based policy decisions, while still scarce, are increasingly available and are increasingly finding homes within SMHA management information systems. As SMHAs improve their information systems to accommodate such data, they face substantial implementation challenges and substantial payoffs in terms of increased knowledge for decision making.

Cost-effectiveness of assertive community treatment teams

Clients who were high service users with serious mental disorders were randomly assigned to assertive community treatment (ACT) or to standard case management (SCM) at three sites and followed for 18 months. Clients in ACT spent more days in the community than did those in SCM, at no additional cost. For clients who were hospitalized at study entry, assertive community treatment was more cost-effective than standard case management.

Clozapine eligibility among state hospital patients

Connecticut State Hospital's entire resident population (n = 1,300) was screened on an arbitrary target day to determine eligibility for clozapine. Sixty percent of 803 patients with schizophrenia or schizoaffective disorder diagnoses met Food and Drug Administration (FDA)- approved criteria for clozapine use as judged by review of past medication trial records and by the responsible physicians. Eighty-eight percent of these patients were medically cleared, and of those cleared, 63 percent agreed to clozapine treatment. Of the patients who began a clozapine trial, 76 percent were still taking the drug 12 months later. Preliminary findings from a randomized trial of clozapine versus usual care (n = 227) indicate that discharge rates associated with clozapine and usual care do not differ. Once discharged, however, patients assigned to clozapine are less likely to be readmitted. Hence, clozapine may be more cost-effective than usual care. However, before savings can be realized, State governments will have to make up-front investments of approximately $140 million simply to give patients hospitalized on a single day a year's access to clozapine.

Implementing assertive community treatment teams

The Connecticut Department of Mental Health began creating assertive community treatment teams in 1987. The authors describe the approach taken by the department in defining the assertive community treatment model, in creating new assertive community treatment teams, and in monitoring the creation and functioning of these teams to ensure that fidelity to the assertive community treatment model is maintained. Assertive community treatment teams can be created even in the absence of funding for new staff by reconfiguring current community-based staff and by moving staff from state hospitals to the community. Preliminary data from a randomized trial in Connecticut comparing assertive community treatment with high-quality case management in areas with an array of community services indicated that the intended models were replicated, with variations in practice style across programs. Clients in assertive community treatment were in the hospital about half as often as clients in standard services and were also less likely to be without a permanent residence. Training and ongoing monitoring of assertive community treatment teams are necessary to detect practices that diverge from the intervention model so that corrective action can be taken.

States' embrace of managed mental health care

Historically, state mental health authorities have dominated public mental health services, operating with fixed resources and responsible for a large population. A good public mental health system has many of the attributes of a well-managed private mental health system. Unfortunately, public systems are not flexible enough to contract creatively with multiple providers; they lack many of the tools of modern managed care. As a consequence, state mental health authorities have begun to contract with private managed care firms to assist them in managing their health care reform efforts, particularly reform of Medicaid. This paper examines the forces shaping managed behavioral health care in the public sector and describes strategies for managing care, such as contracting, utilization review, and monitoring.

Disruption of performance of a lab-born orangutan after introduction of irrelevant foreground cues

Discrimination performance of the three great ape genera has previously been shown to be differentially influenced by the introduction of irrelevant foreground cues, with accuracy of performance of orangutans significantly more disrupted than chimpanzees or gorillas. This disruption may be species-related to how arboreal or terrestrial the subjects would be in their natural habitat. The tendency of the organgutan toward disruption of performance following the introduction of visual foreground cues is not dependent upon an early arboreal environment, because the performance of the lab-born orangutan tested in similar conditions in the present study was commensurate with the performance of previously tested wild-born orangutans.