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Is Early Intervention for Psychosis Feasible and Effective?

Psychiatric Clinics of North America, 3, 35, pages 613 - 631

Services that provide comprehensive, early intervention (EI) have shown promise in improving long-term outcomes in schizophrenia. This article reviews the rationale and salient concepts relevant to understanding the growing EI literature. A selective review of studies evaluating the effectiveness of integrated EI is followed by a discussion of feasibility, especially in the US context. Finally, the authors present a framework that seeks to integrate activities traditionally categorized and separated as discovery and implementation. This framework is offered as a way to advance both goals.

Keywords: Psychosis, Schizophrenia, Early intervention, Critical period.

• Services that provide comprehensive, early intervention (EI) have shown promise in improving long-term outcomes in schizophrenia.
• Randomized trials in Northern Europe and the UK have demonstrated the long term effectiveness and economic viability of EI.
• Emerging data from the US confirms the feasibility of this model of care in the context of public-academic partnership.
• The project of improving early care in schizophrenia will benefit from a framework that integrates initiatives across traditional divisions of discovery-based and implementation research.

Key Points

Intervening early for psychosis: why bother?

Psychotic disorders are common, disabling, and costly under usual care. The prototypic psychotic illness, schizophrenia, affects between 0.55% and 1%1 and 2 of people during their lives; typically manifests in adolescence or early adulthood (an especially formative period for social and vocational trajectories); and is among the top 10 causes worldwide of years lived with disability. 3 With routine care, less than one-fifth of patients achieve full recovery after a first episode of psychosis 4 and less than one-third achieve minimal age-appropriate employment or education. 5 Schizophrenia leads annual US mental illness expenditure, with $22.7 billion in direct healthcare costs (2002) attributed mostly to acute hospitalizations. This, however, represents only about a third of the larger estimated total costs that include the burden of unemployment, reduced workplace productivity, premature mortality from suicide, and family caregiving. 6 Early intervention (EI) services can improve the poor outcomes of usual care. There are intuitively compelling arguments for intervening early in the course of schizophrenia-spectrum disorders. This article reviews these arguments within Birchwood's framework of the “critical period” hypothesis, presents evidence from experimental tests of this hypothesis, and reviews the effectiveness and feasibility of EI services. It concludes with a discussion of how further efforts in this active area of investigation can better address the public health challenge of caring for those with chronic psychotic disorders. The course of psychotic illnesses and the critical period Beginning with Bleuler's 7 classic follow-up study of schizophrenic illnesses, which proposed stable rather than progressive functional decline as the norm in psychotic illnesses, the pessimistic prognostications embedded in early Kraepelinian classifications (exemplified by the term “dementia praecox”) have been strongly challenged. The weight of evidence accumulating against a uniformly deteriorating, degenerative course was summarized in a seminal paper in 1988, which also introduced the concept of a critical period for psychotic illnesses. 8 This includes the three propositions elaborated next, with updated evidence. Mental and Social Deterioration in Schizophrenia-Spectrum Illnesses is Nonlinear Prospective studies have shown that most of the clinical and psychosocial deterioration occurs within the first 2 to 5 years after psychosis onset. 9 This period is notable for high risk for relapse, rehospitalization, and suicide. A 15-year follow-up study of first-episode nonaffective psychosis (in which 63% were eventually diagnosed with Diagnostic and Statistical Manual III-R schizophrenia) reported relapse rates of 43% (1 year); 55% (2 years); and 70% (5 years). 10 Two-thirds of completed suicides in schizophrenia occur within 6 years of diagnosis 11 with risk particularly elevated 1 year after a first psychiatric hospitalization. 12 This early, turbulent period is not usually followed by progressive decline but rather a plateau in symptoms and impairment, even under usual systems of care. Long-term follow-up studies in predominantly chronic populations have confirmed this medium-term stability followed by gradual improvement for a third of patients.13 and 14 A landmark study of 90 early psychosis patients followed for 10 years confirmed a steep decline to a stable 20% to 25% prevalence of residual positive or negative symptoms within 2 years of onset. 15 A recent meta-analysis of longitudinal studies of first-episode psychosis confirmed that the proportion of patients with poor outcomes does not increase over time. 5 Desynchrony Between Clinical and Functional Variables is Evident Early in the Course of Schizophrenia Although studies in chronic illness samples have demonstrated that symptom remission is not necessary for functional recovery,16 and 17 early psychosis populations also express this desynchrony, albeit in the opposite direction: here, early symptomatic remission is often the norm and out of proportion to the levels of functional recovery, at least under usual care. Seventy-five percent or more of individuals with first-episode psychosis show symptom remission within the first year,18 and 19 but less than one-third achieve minimal age-appropriate employment or educational functioning in the first few years after frank psychosis has emerged. 5 The First Few Years Around the Onset of Psychosis Witness the Emergence of Several Important Predictors of Outcome Several factors have been associated with poor long-term outcomes in schizophrenia. Some of these present opportunities for delivering or developing interventions, including prolonged untreated psychosis, social isolation, drug use, insidious onset, living in industrialized countries, and immigration. 16 More recent additions to the list of potentially modifiable factors are affective symptoms, nonadherence to medications, the presence of early negative symptoms, and cognitive dysfunction. 20 Although this list likely represents a mixed bag of factors that are either causally implicated in outcomes, secondary effects of the illness, or confounding variables, many are sources of distress at clinical presentation and have provoked efforts to better understand and modify the disease course. One factor known for some time to be a correlate of relapse risk in psychosis is the level of expressed emotion (conceptualized as including emotional overinvolvement, hostility, and critical comments) by caregivers of affected individuals. 21 Hospitalized patients returning to high expressed emotion home settings have a relapse risk more than double those returning to low expressed emotion homes. 22 The association between expressed emotion and psychosis relapse seems to be valid in early psychosis 23 with evidence that critical engagement by relatives can increase as the illness becomes more chronic, 24 pointing to the potential use of EI. A more recent addition to this list is the emergence of cardiovascular risk factors in early psychosis samples. The markedly premature mortality of patients with chronic psychotic disorders is primarily of cardiovascular origin, results in an estimated shortening of lifespan of up to 20 years, 25 with emerging evidence of a worsening of this mortality gap. 26 This cardiometabolic risk emerges quite early in treatment. 27 Along with antipsychotic choice, the emergence of established risk factors, such as smoking and obesity among younger patients, 28 offers an important opportunity for primary prevention of cardiovascular morbidity and mortality. Increasing evidence in recent years also points to progressive brain changes during the early phases of psychosis. Structural alterations in medial temporal, prefrontal, anterior cingulate, and insular cortex might occur during the acute process of transition to psychosis.29 and 30 However, other brain structural changes (ie, superior temporal gyrus volume reductions) found in early psychosis may progress during the early phase of the illness 31 but show no further reductions during the chronic phase. 32 Progressive gray matter reductions have been reported during the first several years after the onset of frank psychosis. 33 Recent data suggest that brain structure and function (cerebral reserve) before or at the onset of illness may predict better response to treatment, perhaps because of availability of larger neural resources in the service of such adaptive neuroplasticity.34, 35, and 36 Earlier stages of psychotic illness, when significant gray and white matter alterations have not yet set in, may therefore respond better to therapeutic interventions. For example, Eack and colleagues 37 have recently shown a lack of progressive gray matter reductions and increases in gray matter in some brain regions in early course schizophrenia patients treated for 2 years with cognitive remediation by contrast to supportive interventions. Taken together, these observations support a neurobiologic basis for the critical period concept. The critical period hypothesis and EI This hypothesis suggests that intensive efforts to intervene during the critical period (ie, within 2–5 years) after the onset of psychosis can disproportionately alter the trajectory of schizophrenia-spectrum illnesses compared with usual models of care. Usual care is often organized around the dual tasks of acute management of relapses coupled with rehabilitative interventions that typically begin in earnest long after a plateau of functional loss has been reached. This hypothesis makes explicit what has long served as the intuitive basis for improving on such models of care. The trajectories under usual care are depicted in Fig. 1 . The three course types (A, B, and C) are a simplification imposed over the considerable heterogeneity reported in outcomes studies. This likely reflects heterogeneity within any diagnostic class but also the variable impact of environmental factors on genetic risk. Nevertheless, the replicated finding of a subset of patients who recover after a single episode (A) and those who are refractory to present treatments (C) is illustrated in this figure to make the point that current EI services are best positioned to target the various courses collapsed into B, which includes patients who, under ordinary care, suffer multiple relapses with variable and potentially malleable levels of return to premorbid functional trajectories. EI for first-episode psychosis can be conceptualized as including one or more of an interlocking set of strategies composed of two main elements: reducing delay to treatment or reducing the duration of untreated psychosis (DUP), and the provision of more intensive intervention during the 2 to 5 years after identification of a psychotic disorder. 38 The second task includes the provision of phase-specific interventions that are adapted for younger, early course patients and their families. EI, for the rest of this discussion, is used to refer to service approaches that focus on these two tasks, primarily the second. Outside of the scope of this discussion, but addressed by Clarke and colleagues elsewhere in this issue of the Clinics, are the important efforts to predict and prevent conversion to psychosis in high-risk samples. Such efforts to intervene before what is an arbitrarily defined threshold of positive psychotic symptoms are consistent with a neurodevelopmental conception of schizophrenia-spectrum illnesses.39, 40, and 41 However, current limitations on accurate prediction and the lack of established preventive treatments make systematic implementation or assessment of feasibility outside research settings, premature. Reducing the DUP The largest experimental study of the impact of reducing DUP has been the impressive TIPS project. 42 A comprehensive education and detection system was delivered by randomized allocation to a healthcare sector in Norway, whereas two control sectors in Norway and Denmark delivered comparable care but without the benefit of efforts to reduce DUP. Although prior systematic reviews of observational studies had documented a strong correlation of DUP with outcome,43 and 44 the TIPS project succeeded in experimentally manipulating DUP to address the question of whether this measure is a mere confound associated with poor prognosis cases or a causal mediator of outcomes. TIPS demonstrated that reducing DUP (from a median of 1.5 to 0.5 years) led to markedly improved clinical presentations and improved medium- and longer-term (5-year) outcomes.45 and 46 Notably, when the intervention was interrupted, this resulted in measurable increases in DUP followed by attendant worsening in outcomes, further validating the causal inference. 47 Although one other study in Singapore used a broad, multifocal campaign that reduced DUP and improved pathways to care, 48 other less intensive attempts failed to reduce DUP, exemplifying the significant logistical challenge to replicating this finding. 49 Providing Enriched (Multicomponent) Care During the Critical Period Although TIPS demonstrated that intervening earlier improves outcomes, most studies have chosen to focus on the arguably more tractable goal of enriching care after presentation for treatment. Centers in Australia, Northern Europe, England, and Canada have pioneered the development and implementation of service models adapted for early psychosis samples. 50 Within this burgeoning area of research are multiple ongoing studies testing one or more of several pharmacologic and psychosocial approaches to improve outcomes in first-episode psychosis. 51 As is common in an area of intensive research, there are multiple definitions of first-episode 52 and multiple measures of outcome. 51 This diversity in samples, interventions, and definitions of outcome preclude any simple inferences about the overall success of the EI paradigm. 53 The remainder of this article focuses on integrated EI services (ie, those that incorporate several component interventions designed to comprehensively serve the needs of individuals presenting early in the course of a chronic psychotic disorder). In contrast to trials testing the delivery of single treatments (pharmacologic or psychotherapeutic) or interventions focused on demonstrating changes in particular domains (eg, suicidality, comorbid substance use), we draw specifically on studies that evaluate overall, comprehensive services. These models of care are designed to address the wide range of needs presented by patients with early psychosis and their caregivers. Such work seeks to integrate care among the overlapping categories of medical and psychiatric treatment and referral, access to social service, case management, liaison with community supports, social and vocational rehabilitation and education, and support of caregivers. As such, these service models envision the multiple and variable needs of the heterogeneous samples identified as early or first-episode, and are thus the most relevant to a current evaluation of whether EI is effective and feasible. Does EI work? We divide this question in four broad domains ( Box 1 ) that require distinct responses. These are worth explicating in the context of EI before reviewing the salient evidence. • 1. Efficacy: Can it work? • 2. Effectiveness: Does it work? • 3. Costs: Is it worth it? • 4. Translation: Can it be disseminated? Box 1 Evaluating healthcare interventions The first question raises the issue of efficacy or of whether and how much a treatment improves outcomes under relatively ideal conditions. In the context of a clinical trial, this implies recruiting a homogenous population, delivering well-defined treatments in as uniform a manner possible, and measuring outcomes that relate most closely to the putative mechanism of action of the treatment. Such explanatory trials, in essence, attempt to estimate the core therapeutic effects of a treatment. 54 This is in contrast to trials that seek to answer the second question about effectiveness or the impact of a treatment under conditions that are intended to more closely approximate real world clinical settings. With the example of a pharmacologic intervention in mind, it is easy to appreciate the argument that the core therapeutic effect needs to first be demonstrated in an efficacy trial, because a negative result might help avoid futile and expensive effectiveness trials in larger samples. Effects seen in more ideal efficacy conditions might become diluted in effectiveness studies that recruit patients who are more heterogeneous with respect to their response or collect outcomes that may be less closely related to the direct biologic effect of the drug. This linear progression from the establishment of efficacy to the study of effectiveness in more generalizable clinical samples is, however, often not appropriate for complex interventions, such as EI services. Although initial efficacy or proof of concept trials by pioneer EI programs have sought to demonstrate the value of one or more interventions or models of care in selected early psychosis populations, 50 these have varied in terms of their definition of the sample, intervention, and outcome measures and their success at minimizing common sources of systematic bias and generating adequate power to precisely measure effects. A recent systematic review concluded that this presented the risk that the implementation of EI services will far outpace the strength of the supporting evidence. 51 One argument, based on the logic of knowledge development described previously, would seek to thus limit further implementation of services until the active ingredients or essence of these new approaches to care can be better understood and codified. An alternative appraisal is that legitimate differences in goals and attendant methodologic decisions in efficacy versus effectiveness trials should encourage appropriate deviations from this hierarchical convention. 55 Given the inevitable heterogeneity introduced by the current best diagnostic practice in early psychosis populations and the variety of their treatment needs, the more pragmatic position of determining whether a realistically defined service works for a recognizable target population is more relevant to evaluating the value of EI. This would allow empirically based improvements in service delivery to continue even as the effort to better define pathophysiologically meaningful subtypes continues. 56 The pragmatic randomized trial 57 operationalizes an approach that combines elements of traditional explanatory trials with considerations of real-world effectiveness that is well suited to the current state of knowledge in schizophrenia. Subjects are randomly allocated to alternative service options, thus deviating from real-world clinical practice, but allowing minimization of selection bias. However, these studies embrace more biologically heterogenous samples that seek to mirror those that actually present to systems of care; use interventions that attempt to reflect what could be realistically delivered in such systems; and assess outcomes, often long term, that are most salient to stakeholders in such systems, including patients, families, and policy-makers. There are four such second-generation trials in the EI literature that are focused on determining the effects of integrated EI service models. Consistent with the pragmatic focus, these trials from four different countries reflect local system resources and constraints in their design and fall on different positions along the efficacy–effectiveness continuum in the domains of sample, intervention, and outcome measurement ( Table 1 ). Table 1 Pragmatic randomized controlled trials of integrated early intervention services: design characteristics Study Sample Interventions Outcomes Measured LEO: Lambeth (United Kingdom) Setting: Mental Health Service in Lambeth, London, UK. Recruitment January 2000 to October 2001. Broad inclusion criteria: 16–40 year olds with first or second presentation for nonaffective psychosis and no previous routine community mental health treatment. • 1. Specialized multidisciplinary team: assertive outreach team with patient/clinician ratio of 10:1/LD-SGAs/family counseling/CBT. • 2. Standard care from community mental health teams with LD-SGA. Broad, including clinical (eg, relapse, readmission); functional (eg, vocational functioning); and economic (eg, service use). OPUS: Copenhagen (Denmark) Setting: community-based mental health services in Copenhagen and Aarhus Counties. Recruitment from January 1998 to December 2000. Inclusion criteria: 18–45 years, schizophrenia-spectrum diagnosis by ICD-10/F2 category, no more than 12 weeks of continuous antipsychotic drug treatment. • 1. Specialized multidisciplinary team assertive outreach team with patient/clinician ratio of 10:1/LD-SGA/MFG, SST group/vocational strategies. • 2. Standard care in a community mental health center, patient/clinician ratio ∼30:1. As above Grawe–Sør-Trøndelag County (Norway) Setting: community-based county mental health services. Recruitment initiated in 2001. Inclusion criteria: consecutive referrals ages 18–30 years, DSM-IV schizophrenia-spectrum disorders, within 2 years of psychosis onset. • 1. Integrated treatment: home-based outreach with patient/clinician ratio of 10:1, multidisciplinary team; family psychoeducation, CBT- based communication strategies for families and individual therapy for patients and LD-A. • 2. Standard care: office-based, focused on pharmacotherapy and problem-based case management. Clinical (relapse, readmission); functional (GAF); and economic. STEP-New Haven (United States) Setting: community mental health center in New Haven county. Broad inclusion criteria: psychosis onset within past 5 years, no more than 12 weeks lifetime exposure to antipsychotic treatment. • 1. Integrated care: specialized multidisciplinary team, office-based, patient/clinician ratio ∼30:1; structured family psychoeducation; CBT-based group and individual problem solving, vocational and educational assistance as needed and pharmacotherapy. • 2. Standard care: office-based, focused on pharmacotherapy and rehabilitative case management. Broad, including clinical (eg, relapse, readmission); functional (eg, vocational functioning); and economic (eg, service use). Abbreviations: CBT, cognitive-behavioral therapy; DSM, Diagnostic and Statistical Manual; GAF, Global Assessment of Functioning scale; ICD, International Classification of Diseases; LD-A, low-dose antipsychotics; LD-SGA, low-dose second-generation antipsychotics; MFG, Multi-Family Group psycho-education; SST, social skills training. The UK-based Lambeth Early Onset (LEO) study randomized individuals with early psychosis to an intensive and case-managed treatment regimen of assertive community-based interventions comprising cognitive behavioral therapy, family counseling, vocational services, and low-dose antipsychotic medication. Subjects receiving specialized services had lower rates of relapse and dropout, improved measures of social and vocational functioning, satisfaction, quality of life, and medication adherence at 18-month follow-up.58 and 59 The Danish OPUS study offered a similar set of specialized interventions, using a model of home-based assertive case management integrated with pharmacotherapy that favored lower-dose antipsychotics, and included family and individual psychoeducation with social skills training and vocational assistance as needed. This enriched intervention was applied for 2 years and, compared with involvement with a standard community mental health team, 60 delivered benefits in positive and negative symptom control, secondary substance abuse, treatment adherence, and higher satisfaction with care. 61 A Norwegian study of a similar home-based integrated approach compared with standard office-based care reported 2-year improvements in the number and duration of hospitalizations and the frequency of excellent outcomes (a composite that included relapse in symptoms and adherence to treatment) in the group receiving the enriched intervention. Finally, the ongoing STEP trial, directed by one of the authors, delivers an office-based integrated package that includes structured family psychoeducation, cognitive behavioral individual and group therapy, antipsychotic medications, and vocational and educational supports as needed. The treatment is delivered in a US community mental health center and compared with usual care will soon report similar trends in reduction of hospital use and improvement in vocational and social outcomes. 62 All four studies used a rigorous, albeit pragmatic, randomized design and demonstrated measurable and nontrivial improvements in outcomes across four distinct healthcare systems. Although the first three trials used a particularly resource-intensive model of home-based outreach with enriched clinician/patient ratios (∼1:01) that could be sustained only for a limited period of 2 years, the last trial has used a more pragmatic intervention that is office-based, with a clinician/patient ratio that mirrors the usual care arm (∼1:30). This has allowed the integrated intervention to be sustained without a time limit but instead with gradual transfer to usual services in a stepped, individualized manner. In OPUS and LEO, much of the demonstrated benefit was not durable at 5-year follow-up (ie, approximately 3 years after specialized care was discontinued).62 and 63 This has raised questions of how long intensive care should be sustained and how to mitigate the presumed adverse effects of transferring care from specialized services. Some have raised ethical concerns about offering such enriched interventions for less than 5 years, given that this can be a particularly vulnerable period in development. 64 The STEP approach of offering a less resource-intensive approach that can be sustained longer with an individualized and gradual transition out of specialized care was designed to test an alternative approach. Similar approaches of using stepped reductions in intensity to prolong care through 5 years after entry have demonstrated durable effects in a Canadian public-sector program. 65 Are EI services worth the cost? The emergence of psychotic disorders in adolescence and young adulthood, their chronicity, and their widespread effects on cognitive functioning make them immensely disabling over the lifespan, placing them in the top 10 causes of disability in developed countries worldwide. 3 The direct healthcare ($22.7 billion) and total (\$62.7 billion) costs in the United States 6 are comparable with estimates for far more common depressive disorders. 66 Similar cost estimates undertaken in the United Kingdom have shown a comparable economic burden. 67 Although there is a clear need to improve outcomes to reduce these costs, the fact of limited healthcare resources implies that investments in one area of public health need to be diverted from another. Economic analyses are emerging as the dominant way to quantify such “opportunity costs” and to inform the relative value placed on healthcare services, such as EI.

Several methodologic choices determine whether an economic analysis can provide valid justification for resource allocation. 68

Measure Costs

First, is the measurement of costs. Focusing solely on direct expenditures or the costs of providing treatment (including inpatient, outpatient, and community health and social services) may seriously underestimate the overall costs of a serious mental illness. In a study of schizophrenia in England, such expenses accounted for less than a fifth of the total cost estimate. 69 The latter ideally includes comprehensive measures of indirect costs, such as lost opportunities for work and leisure and the cost of informal care provided by caregivers.

Measure Benefits

Second, choices made in the measurement of benefits can prejudice the scope of cost analyses. For instance, the surrogate outcomes of symptom control in psychosis may or may not adequately predict vocational functioning or overall quality of life, although these are far more challenging to measure.

Define Comparator

Third, it is important to define an adequate comparator to EI services against which economic gains or losses can be measured. The best available local alternative would provide the most stringent test of an EI service, whereas a poor-quality comparator might inflate estimates of the effectiveness of an integrated approach.

Integrate Life Expectancy Gains with Quality-of-Life Gains

Fourth, economic analyses attempt to integrate life expectancy gains with quality of life gains experienced during a particular time window. In the most common type of evaluation, or cost utility analyses, 70 interventions are assigned a weighted score representing quality of life over a time period, measured in terms of quality-adjusted life-years (QALYs). Comparing interventions in a ratio of currency (eg, dollars) per QALY allows for assessment of the relative benefits conferred by treatments across diseases. During the last decade QALYs have been frequently used in the evaluation of health benefits. 71 The UK-based National Institute for Health and Clinical Excellence, which provides service planners in England with QALY-based guidance, has endorsed EI services and recommends that they include “a full range of relevant pharmacologic, psychological, social, occupational and educational interventions for people with psychosis.” 72 The use of QALYs has, however, met with criticism, especially in their lack of responsivity to real improvements in mental distress and disability. 73

Finally, it is generally recommended that economic evaluations take a broad societal perspective. This is in contrast to measuring costs solely from the perspective of an insurer, provider, caregiver, or consumer of mental health care, which each bear only a fraction of the costs exacted by psychotic illnesses. With respect to EI, even small reductions in unemployment and family burden with long-term implications (indirect costs) might offset more immediate but larger per-patient costs of intensive, integrated care (direct costs). Aside from quantifying these costs, a societal rather than a provider perspective would be required to favor resource allocation to such an EI service whose greatest gains might manifest many years after initiation of the intervention. 68

With these considerations in mind, available evidence on the potential for EI to deliver cost-effective care is not definitive. 74 An initial analysis from PEPP-Montreal investigated differences in expenditures before and after initiation of EI services, showing cost reductions but with uncertainty about whether this could be attributed to the EI service. 75 A similar pre and post study design for new EI services in Hong Kong and Italy found intervention to be good value for money as measured by limited outcomes and costs for the short-term (24 months, Hong Kong) 76 and medium-term (5 years, Italy). 77 In Sweden and Australia, specialized EI services were found to have lower costs (mostly because of decreased inpatient hospitalizations) and improved symptomatic and functional outcomes, although the durability of these differences remained questionable.78 and 79 Extending their analysis to 8 years in a smaller sample, the Australian group subsequently found lower levels of positive symptomatology, improved remission rates and illness course, trends toward increased employment, and significantly lower direct service costs among the EI group. 80 This study is important in that it suggests that EI confers long-term advantages if more comprehensive indirect costs are taken into account.

Additional data from the LEO study evaluated a range of costs in detail. 81 Baseline and 18-month mental health service contacts and service use costs were overall higher for individuals receiving EI, with a small but insignificant total cost savings (primarily caused by reduced hospitalization). EI subjects trended toward greater vocational recovery and significantly elevated quality of life, effects that if sustained in longer-term follow-up deliver significant indirect costs reductions.

The notion of whether a broad societal perspective is possible for a system to adopt and to thereby promote the goals of public health for the generally shorter-term and narrower incentives faced by specific agents in the healthcare arena, highlights the importance of appreciating the cultural and policy context in which inferences about cost-effectiveness are made. 80 Health systems ensuring universal coverage (through either social insurance or single-payer schemes) might be more enabled to adopt such a perspective compared with systems in which healthcare coverage is less consistent. In latter systems, such as in the United States, strong incentives exist to shift costs between different payers with measurably adverse outcomes for patients and their families early in the course of psychotic illnesses. 82 Also, service use patterns and the costs associated with them can vary between sites and across countries. 83 This severely limits extrapolation of economic analyses across systems of care.

Is EI feasible?

It is worth noting that the development of multiple EI services across the globe has occurred in response to a pervasive dissatisfaction with standard services that were well known to be inadequately addressing the needs of these patients and their families. 84 After weighing the emerging evidence for these new approaches, the United Kingdom’s National Health Service announced in 2000 the implementation of 50 EI teams across the country. 85 This signaled a commitment toward resourcing EI, which although meeting stakeholder demand has made possible further study and refinement of models of care.

The large number and range of innovative EI services in several countries has in effect demonstrated the acceptability of this approach to a wide range of stakeholders. 86 A more stringent requirement for feasibility, however, might also reference the last question (see Box 1 ) (ie, whether EI services can be disseminated across usual systems of care). Services that are demonstrated to work but cannot be implemented on a wide scale have marginal public health impact. This implementation gap has been documented in the United States for several mental illnesses87 and 88 and for schizophrenia in particular.89 and 90 This experience has suggested the impact of a complex set of barriers and the tasks of dissemination and implementation of effective interventions has itself become an active focus of study. 91

Healthcare systems in the United Kingdom, Northern Europe, and Australia have already made substantial commitments to specialized EI services, whereas in the United States a comparable national strategy for improving systems of care is conspicuously absent. Although a detailed consideration of the barriers specific to the different regions in the United States is beyond the scope of this article, certain factors known to many clinicians are illustrative.

• 1. First is the public-private sector divide. Privately insured patients struggling with the emergence of a serious mental illness can rapidly lose health insurance 82 and typically arrive at the public state mental health system long after the critical period for EI has elapsed.
• 2. Second, several states care for adolescents and young adults by separate agencies, thus fragmenting care during the peak ages of risk for psychosis onset. Working across organizational cultures with their different emphases on protection of vulnerable children versus the treatment of serious mental illness proves challenging.
• 3. Third, the division of public mental health care by geographic catchments in the public sector can limit the collection of a critical mass of patients with early psychosis around which to organize care.

Reassuring cost data from other countries, reviewed previously, have had limited impact so far on EI service development in the United States. An important factor, as explicated in the previous section, is that there are powerful nonsocietal perspectives on economic burden at play in US healthcare delivery. Added to this is a paucity of US data on reduction of direct costs that would respond to the perspectives of private and public insurance providers in this country. The feasibility of EI, as for any complex intervention, thus depends as much on the particular perspective adopted within a particular system of care as the data on locally relevant costs. Such data, from the most salient pragmatic trials reviewed previously, suggest consistently positive effects on a variety of domains of outcome but only one such trial will deliver US-based data. Given this, there is reason to remain uncertain about the feasibility of disseminating EI in the United States, beyond research-funded settings.

What next: doing what is known while knowing better what to do

There are important gaps in knowledge of psychotic disorders that span the range from basic knowledge of cause, pathogenesis, and clinical classification to the more complex domains of dissemination and implementation. A few examples of basic uncertainties in the first domain are instructive.

• 1. First is the knowledge that early exposures to biologic or psychosocial stressors in utero, during the perinatal period, or around childhood could be causal and may be difficult to address or modify by the time of a first episode of psychosis in early adolescence or adulthood. Truly EI for these neurodevelopmental processes may thus have to await knowledge that allows action in the perinatal period or long before the currently discernible critical period.
• 2. Second, cognitive impairments can be broad and established by the time of a first episode 92 ; the opportunity to prevent or ameliorate these deficits awaits more reliable identification of patients before their first break. 93
• 3. Third, ongoing structural brain alterations have been reported up to 20 or more years after the onset of symptoms and are associated with poor outcomes.94 and 95 This suggests that whatever the claims made for early course corrections, active attention needs to be paid over the longer term to ensure optimal outcomes.

In the second domain is the recognition, across disorders, that the success of disseminating a model of care (what is referred to as “feasibility” in this article) depends on a host of factors that range from the more generic challenges of changing clinician behavior to the more specific, parochial concerns of individual healthcare systems. Furthermore, there are distinct methodologic challenges in evaluating complex interventions, such as EI services, which deploy multiple interventions that are variably used by different participants. This makes it difficult and sometimes impossible for even large trials to confirm the active ingredients of the integrated service. 96

It is important to recognize that gaps in the areas of knowledge (knowing what to do) and implementation (doing what is known) impair the ability to most effectively intervene in the early phases of illness. Distinct attention to both these areas is necessary. However, this distinction between knowledge and its translation can itself present a barrier to progress. Especially in the field of EIs for schizophrenia-spectrum disorders, reified divisions between discovery and translation- or implementation-oriented activities present another potential barrier.

Current consensual standards of evidence among US experts that result, for instance, in recommendations for broader implementation of models, such as Assertive Community Treatment or Supported Employment, 89 do not endorse EI. Commentators have reasonably questioned what the essential ingredients of EI might be and whether existing models of EI are merely providing what should be normal best practice. Such knowledge, which would permit more personalized and illness phase-specific treatment, requires access to populations who are early in the course of psychotic illness. Such populations are well known to be extremely difficult to recruit and retain in studies, a project that would be greatly aided by the kinds of EI services that have demonstrably improved pathways into and through care.

The current dichotomy between implementation and research can thus lead to an impasse. There are several lines of work that suggest a way forward. First, managers of healthcare resources, especially in the United States, should pay attention to how nationalized health systems elsewhere have responded to the suggestive, even if not definitive, evidence on secondary prevention in psychosis. Programs in the United Kingdom and Australia have demonstrated that vital information (across the domains of disease physiology to cost-effectiveness of models of care) can emerge from implementations of EI services. The ongoing STEP trial (see Table 1 ) and the large ongoing RAISE initiative 97 will deliver more US-relevant economic data. In an important respect, at least limited implementation may be necessary to generate locally actionable evidence on the range of questions relevant to early intervention.

The Knowledge Translation framework 98 used by the Canadian Institutes of Health Research suggests a more reciprocal organization of knowledge creation and implementation in an “action cycle.” In the context of meeting the dual challenge of delivering better early care and improving the ability to study the early course of schizophrenia, we propose a further weakening of this division with three elements that could help advance the field. Given the context specificity of feasibility discussed previously, this proposal is specific to the United States, but likely of relevance to other countries that are less able to rely on a societal perspective for resource allocation:

• The implementation of EI services within public-academic collaborations. Ideally the intensity and range of clinical services would be supported but also limited by the available resources of the public community center. Such an ecologically real-world model would also be protected from changes in grant funding and could revive and draw on a traditional hub of community psychiatry in the United States. 99
• The use of a pragmatic randomized controlled trial design to select locally relevant samples, deliver manageable interventions, and measure locally salient outcomes with a minimum of extra resourcing. 100
• A commitment to measure outcomes, including costs, and to use this information to alter local processes of care. Ineffective or overly expensive services, from the perspective of the local healthcare agency, could then be discontinued or refined as necessary.

An important aspect of this proposal is the attempt to decentralize the development and implementation of EI services and to embrace the reality of the differing perspectives of actors in the current healthcare system. The perspective of the public-academic collaboration is suggested as the most likely to advance public health goals. This is suggested in contrast to the traditional approach of developing, testing, refining, and then manualizing services in mostly research settings before devising strategies to have these adopted more widely. This “develop then disseminate” approach is slow, cumbersome, inflexible to emerging knowledge, and does not adequately address the different incentives that agencies may have toward particular problems or populations. Also, as evidenced in successive national reports for schizophrenia, this approach has not been successful in increasing the uptake of empirically based interventions.89 and 90

The enthusiasm generated by work in EIs for psychotic disorders is evidenced by the wide implementation of services and the wealth of data accumulating from studies across the translational continuum. Beyond having an impact on schizophrenia-spectrum disorders, this work can suggest frameworks for other serious mental illnesses. Most are chronic diseases of adolescence 101 and as such offer similar opportunities for societal investment in health. 102

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Footnotes

a Department of Psychiatry, Yale University, New Haven, CT, USA

b Clinic for Specialized Treatment Early in Psychosis (STEP), 34 Park Street, Connecticut Mental Health Center, Room 273A, New Haven, CT 06519, USA

c Harvard Longwood Psychiatry Residency Training Program, Department of Psychiatry, Harvard Medical School, 330 Brookline Avenue, Rabb-2, Boston, MA 02215, USA

d Department of Psychiatry, Beth Israel Deaconess Medical Center and Massachusetts Mental Health Center, Harvard Medical School, Room 610, MMHC 75 Fenwood Road, Boston, MA 02115, USA

Corresponding author.

This work was supported by NIH grant MH088971 and a grant from the Donaghue Foundation (Srihari, PI); NIMH grants MH 64023 and MH 78113 (Keshavan, PI); and aDupont-Warren Research Fellowship, Harvard Medical School (Shah).

Disclosures: Dr Keshavan has received grant support from GSK and Sunovion.