Dual diagnosis: A systematic review of the organization of community health services

A systematic review and meta-analysis of psychosocial interventions for persons with comorbid anxiety and substance use disorders

BACKGROUND & AIMS

Anxiety and substance use disorders are highly comorbid and represent two of the leading causes of disease burden globally. Psychosocial interventions are important treatment options for people with co-occurring anxiety and substance use (A-SUD). To date, few reviews have assessed the efficacy of psychosocial treatments for patients with A-SUD. This systematic review and meta-analysis aims to synthesize this literature and assess the efficacy of psychosocial interventions among patients with A-SUD.

METHODS

We searched all relevant records published until March 2023 in Medline, EMBASE, PsycINFO, CINAHL and Google Scholar. Two authors extracted and reconciled relevant data and assessed risk of bias. Random effects models were used to calculate effect sizes using Hedges' g for post treatment and follow-up time points. Main outcomes of the review were anxiety, alcohol use, and use of other substances. We examined effects on depression as a secondary outcome since it commonly co-occurs with A-SUD.

RESULTS

Psychosocial interventions for co-occurring A-SUD showed moderate effects on anxiety (g = 0.44), alcohol (Hedges' g = 0.29), and other substance use (g = 0.38) at post intervention. Large effects were observed on depression (g = 0.88) at post intervention with high heterogeneity. These effects were maintained at follow-up for anxiety (Hedges' g = 0.38), other substances (g = 0.44), and depression (g = 0.50). Moderation analyses for demographic factors, intervention characteristics, community level factors, anxiety reduction, and alcohol use reduction, were non-significant.

CONCLUSIONS

The current meta-analysis investigated the effects of psychosocial interventions on patients with anxiety and co-occurring SUD. The analyses indicated promising moderate-sized effects of treatment on anxiety, alcohol, all other drug use, and depression. The findings point to important avenues for psychosocial treatment while highlighting critical gaps in knowledge to be addressed in future research.

Examining Profiles and Treatment Outcomes in Dual Diagnosis: Comparison of Coordinated Treatment With Mental Health Services Versus Addiction Center Alone. A Real-World Data Analysis

OBJECTIVE

The aim of this work was to examine the profile and treatment outcomes of patients with dual pathology depending on whether the patients were attending addiction centers or are being treated in a coordinated model by mental health services.

METHODS

Data from 7225 dual diagnosis patients were used, of whom 2417 (33.5%) received treatment in the mental health coordinated modality. Clinical information was taken from the patients' electronic health record.

RESULTS

Differences were found in patients' sociodemographic and comorbidity profiles according to treatment modality. In general, coordinated care yielded favorable outcomes (higher attendance and lower dropout rates but no differences in retention). The logistic regression analysis identified predictors of patient profiles in coordinated care, emphasizing having a severe mental health disorder (OR = 3.878, 95% CI [3.443, 4.368]; p = .000), being referred by social/health services, or having retired status. Main differences were observed according to the comorbid diagnosis presented, particularly in cases in which the patient had impulse control, hyperkinetic, or cluster C personality disorder.

CONCLUSIONS

While therapeutic outcomes are influenced by associated comorbidities, the disorders prognosis can be favorable with appropriate treatment. Furthermore, analysis of differences according to treatment modality allows for predicting the type of patient who will receive a particular service, which enables the development of tailored treatments.

Which Factors Are Associated With Comorbid Psychiatric Conditions in Patients Affected by Substance Use Disorders? The Impact of COVID-19 Pandemic on Dual-Diagnosis Subjects

OBJECTIVE

To investigate demographic/cinical variables associated to dual diagnosis and the psychological reaction of dual-diagnosis patients to COVID-19 pandemic.

METHODS

Information was collected at the Addiction Service of Monza, Italy. The Impact of Event Scale-Revised (IES-R), a self-report questionnaire measuring the subjective response to a traumatic event, was administered. Univariate analyses and binary logistic regression were performed. IES-R scores were compared between groups defined by qualitative variables through one-way analyses of variance (ANOVA).

RESULTS

118 outpatients were included, 48.3% with dual diagnosis. Alcohol use disorder and being female were associated to dual diagnosis. IES-R scores were significantly higher in the dual-diagnosis group, especially for personality disorders (PDs). IES-R scores were higher in patients taking treatment for substance use disorder (SUD).

CONCLUSIONS

Females and alcohol abusers were at-risk subjects for dual diagnosis. Patients with SUD and PDs may benefit from additional support, especially when traumatic life events occur.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT04694482.

The Impact of the COVID-19 Pandemic on the Severity of Alcohol Use Disorder: Significance of Dual Disorders

The coronavirus disease 2019 (COVID-19) pandemic has been assumed to impact patients diagnosed with alcohol use disorder (AUD). The severity of the influence that the COVID-19 pandemic had on the symptoms of AUD has not yet been revealed in detail. The aim of this study was to examine the impact of the COVID-19 pandemic on patients diagnosed with AUD. This retrospective study was conducted between 11 March 2017 and 31 May 2022 in Hungary. Medical charts (N = 1082) of inpatients with the diagnosis of AUD were reviewed. Based on the dates of admissions, two groups were created: the 'before COVID-19' group (11 March 2017-10 March 2020) and the 'during COVID-19' group (11 March 2020-31 May 2022). Chi-square tests, independent-sample t-tests, and multinomial logistic regressions were performed. The occurrence of delirium tremens (DT) and psychiatric co-morbidities was significantly higher during the pandemic. Our results showed that the occurrence of DT and psychiatric co-morbidities significantly increased during the pandemic. Our results revealed that the pandemic enhanced the severe consequences of AUD, and the development of AUD might have increased in frequency among individuals previously diagnosed with mental illness during the pandemic. These findings indicate the significance of dual disorders in the post-pandemic period.

Predictors of Mortality Following a Schizophrenia Spectrum Diagnosis: Evidence From the 20-Year Follow-up of the OPUS Randomized Controlled Trial

BACKGROUND AND HYPOTHESIS

The life expectancy of patients diagnosed with schizophrenia is 10-12 years lower than in the general population and the mortality gap seems to be worsening. Many of these deaths might be avoidable. We aimed to determine mortality rates and causes of death after a first-episode psychosis, and to examine if clinical characteristics at baseline or during illness could predict mortality.

STUDY DESIGN

The OPUS study was a randomized controlled trial of 578 patients first diagnosed with schizophrenia spectrum disorders. Patients were clinically assessed after 2, 5, 10, and 20 years. Information about time and cause of death was obtained from the Danish Cause of Death Register. Hazard ratios were used to assess predictors of death.

STUDY RESULTS

In total, 82 (14.4%) participants died during 20 years of follow-up. The most common cause of death was suicide (27%). At baseline employment (HR 0.47 P = .049), psychotic disorder other than schizophrenia (HR 0.36, P = .017), and longer duration of untreated psychosis (HR 0.57 P = .042) predicted lower mortality while substance use predicted higher mortality (HR 2.56, P < .001). During follow-up, symptom remission without antipsychotic medication and recovery predicted lower mortality (HR 0.08 P = .013 and HR 0.21, P = .028) while substance use (HR 3.64 P < .001), and all chronic illnesses predicted increased risk.

CONCLUSIONS

There is an increased risk of early mortality in schizophrenia compared to the background population, and there is an urgent need for new efforts to improve the disparities in health that lead to this increased mortality.

Achieving integrated treatment: a realist synthesis of service models and systems for co-existing serious mental health and substance use conditions

Approximately 30-50% of people with serious mental illness have co-existing drug or alcohol problems (COSMHAD), associated with adverse health and social care outcomes. UK guidelines advocate both co-occurring needs being met within mental health services, but uncertainty remains about how to operationalise this to improve outcomes. Various unevaluated service configurations exist in the UK. A realist synthesis was done to identify, test, and refine programme theories of how context shapes the mechanisms through which UK service models for COSMHAD work, for whom, and in what circumstances. Structured and iterative realist searches of seven databases identified 5099 records. A two-stage screening process identified 132 papers. Three broad contextual factors shaped COSMHAD services across 11 programme theories: committed leadership, clear expectations regarding COSMHAD from mental health and substance use workforces, and clear care-coordination processes. These contextual factors led to increased staff empathy, confidence, legitimisation, and multidisciplinary ethos, which improved care coordination and increased the motivation of people with COSMHAD to work towards their goals. Our synthesis highlights that integrating COSMHAD care is complex, and both individual and cultural behavioural shifts in leadership, workforce, and service delivery are essential to ensure people with COSMHAD receive compassionate, trauma-informed care that meets their needs.

Utilising the Implementation of Integrated Care to Develop a Pragmatic Framework for the Sustained Uptake of Service Innovations (SUSI)

The provision of integrated care (IC) across alcohol and other drug (AOD) and mental health (MH) services represents the best practice, yet the consistent delivery of IC in routine practice rarely occurs. Our hypothesis is that there is no practical or feasible systems-change approach to guide staff, researchers, or consumers through the complex transition that is required for the sustained uptake of IC across diverse clinical settings. To address this gap, we combined clinical and consumer expertise with the best available research evidence to develop a framework to drive the uptake of IC. The goal was to develop a process that is both standardised by the best available evidence and can be tailored to the specific characteristics of different health services. The result is the framework for Sustained Uptake of Service Innovation (SUSI), which comprises six core components that are applied in a specified sequence and a range of flexible activities that staff can use to deliver the core components according to their circumstances and preferences. The SUSI is evidence-based and practical, and further testing is currently underway to ensure it is feasible to implement in different AOD and MH services.

Integrated vs non-integrated treatment outcomes in dual diagnosis disorders: A systematic review

Background

The incidence of dual diagnosis (DD) (i.e. substance use disorders [SUD] and co-occurring mental disorders) is widespread; however, they vary widely in permutation and combination. As a result, establishing effective and empirically supported interventions for this clinical population remains challenging.

Aim

This study aimed to examine current literature on the treatment outcomes for patients with DD.

Method

A systematic review of randomised controlled trials (RCTs) published between 2009 and 2018 was conducted for two broad intervention categories identified by the literature: non-integrated and integrated treatment. Multiple electronic databases were searched using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines (PRISMA).

Results

The search generated a total of 743 studies, of which 11 satisfied the inclusion criteria. These studies were thematically synthesised into two main analytical themes: 'treatment outcomes' and 'reported strengths and limitations of DD treatment'. Specifically, integrated treatment held an advantage over non-integrated treatment in significantly improving psychiatric symptomatology. However, no significant benefits were found between integrated and non-integrated treatment regarding substance misuse and treatment retention.

Conclusion

Overall, the results provided insufficient evidence to support the enhanced efficacy of integrated or non-integrated treatment over the other in treating patients with DD.

Contribution

The study's findings were used to provide recommendations to inform the clinical psychological service delivery of dual diagnosis treatment in South Africa and also to identify gaps in the literature and highlight areas for future research.

A systematic review of the perceptions and attitudes of mental health nurses towards alcohol and other drug use in mental health clients

Mental and substance use disorders are leading contributing factors for the Australian non-fatal burden of disease. These disorders frequently co-occur in the mental health population, and mental health nurses are the largest group of professionals treating dual diagnosis. A comprehensive understanding of mental health nurses' attitudes and perceptions is required to inform future implementation of dual diagnosis training programs. A systematic literature review of sources derived from electronic databases including Medline, CINAHL, SCOPUS review, and PsychINFO, along with Connected Papers. Selection criteria included a focus on mental health nurses' attitudes towards dual diagnosis of mental illness and substance use. Extracted data was qualitatively synthesized. Of the 5232 articles retrieved initially, 12 were included in the review. Four themes emerged from the synthesis: drug and alcohol use among mental health consumers (seven studies), caring for dual diagnosis consumers (eight studies), role perception (six studies), and treatment optimism (five studies). Salient beliefs included substance use as a self-inflicted choice (71%) or a form of 'self-medication' (29%); a lack of willingness to provide care (75%), or a strong commitment to care (25%); greater comfort with screening and acute medical management rather than ongoing management (83%); and pessimism about treatment effectiveness (100%). Mental health nurses' beliefs and attitudes towards dual diagnosis were often negative, which is likely to result in poor quality care and treatment outcomes. However, the lack of recent studies in this research area indicates the need for up-to-date knowledge that can inform the development of training programs.

Addressing Substance Use and Misuse in East Texas: Stakeholder-Driven Needs and Priorities

Background-This project sought to assess needs, perceived challenges, and priorities regarding substance use disorder (SUD) in East Texas and develop a community-driven research agenda to address those challenges. Methods-Data were gathered through nine focus-group discussions (FGDs) with stakeholders: people living with SUD, families, medical providers, counselors, representatives of community-based organizations, and law enforcement officers. We asked participants how substance use manifests in their communities, which challenges they confronted in coping with substance use and misuse, and in which order their needs should be prioritized. Findings were reported at community forums to confirm the list of challenges and prioritize needs. Results-Five themes emerged from the FGDs indicating major challenges: (a) access to SUD treatment and recovery resources, (b) mental health and resiliency, (c) education, training, and professional development to facilitate treatments, (d) care and service coordination, and (e) community/social support for people living with SUD and their families. Conclusions-Significant resources such as financing, collaboration across silos, and community education are needed to effectively manage this public health problem. Our findings can inform research and outreach to help East Texans develop interventions, research programs, and educational opportunities for clinicians, community-based organizations, law enforcement officers, and counselors to build capacity for SUD prevention, treatment, and recovery.

Clinical care of patients with dual disorders in India: diverse models of care delivery

Purpose

This study aims to offer an overview of the models of clinical care of the patients with dual disorders in India.

Design/methodology/approach

All the members of the Dual Diagnosis India Network (DDIN) who shared the clinical care delivery at their center were invited to share the details of their model. In addition, an invite was also sent to those members who could not attend the online session but were interested in contributing the required information about their model. The information shared by the respondents was collated. The different models were then categorized based on their features.

Findings

Following the categorization of the clinical care services organization across different settings, five different models emerged. These were specialized dual diagnosis clinic; services for dual disorders offered as substance use disorder (SUD) treatment services within general psychiatry care; services for dual disorders in general psychiatry care; services for dual disorders offered as SUD treatment services separated from general psychiatry care; and services for dual disorders offered in general psychiatry services combined with exclusive SUD treatment services.

Originality/value

Currently, there is limited literature on models of dual disorders from the low- and middle-income countries. The authors believe that the documentation of these models from India shall be of help while setting up services for dual disorders in other health-care settings. This study can be a valuable resource for making informed choices while setting up new services.

Smoking cessation among people with mental illness: A South African perspective

Tobacco use is recognised as a serious, worldwide public health concern. Smoking cessation is of great interest across a wide range of medical specialities, including family medicine. However, smoking cessation among people with mental illness (PWMI) has attracted scant attention in South African literature. This is despite PWMI suffering disproportionately from the damages of tobacco. The harms of smoking are not limited to physical health but extend to mental health. This article discusses the need for multifaceted smoking cessation treatments for PWMI in the public health sector, taking into consideration the prevalence and unique drivers of smoking in this population. A brief overview of patterns of tobacco use, associated harms and smoking cessation interventions in South Africa is given; all within the context of mental illness.

Chicken or egg: A dual diagnosis narrative

WHAT IS KNOWN ON THE SUBJECT?: Dual diagnosis is a term used to describe persons who have a co-occurring mental health and substance misuse disorders. It is the cause of significant economic burden to health care, justice and educational systems. It is well reported that to date dual diagnosis is under-diagnosed and poorly treated within the confines of mental health services WHAT THE PAPER ADDS TO EXISTING KNOWLEDGE?: It demonstrates that the need for service reform where all services are equipped with the necessary tools required to adequately support a person with dual diagnosis. WHAT ARE THE IMPLICATIONS FOR MENTAL HEALTH NURSING?: The narrative provides a real-life, candid description of how trauma in early childhood can cause significant challenges when one becomes older. The narrative identifies the dangers of not diagnosing a dual diagnosis early, resulting in only treating half the presenting issues. This narrative also offers hope to individuals in current distress, as well as for those supporting such individuals, as it clearly demonstrates that with the right supports and encouragement, recovery is possible. ABSTRACT: Introduction Dual diagnosis describes when a person has two co-occurring disorders. It is often difficult to diagnose and this can lead to prolonged suffering on behalf of the individual. Aim To provide a lived experience narrative of the early recovery journey of a person with a dual diagnosis. Method This aim was achieved through the use of a narrative based methodology. Results The journey of life leading to a dual diagnosis and beyond is described under the following headings: Formative Years, Substance Misuse, When Life gives you Lemons, They Say Nothing lasts Forever, From the Ashes, Early Recovery and Luck or Fate? DISCUSSION: The narrative presented describes a first hand experience of the struggles leading to a dual diagnosis and how receiving the diagnosis has supported the recovery journey of the first author.

The dual diagnosis clinician shared care model – a clinical mental health dual diagnosis integrated treatment initiative

Purpose

To improve outcomes for people with co-occurring mental health and substance use disorders, the Eastern Health Mental Health Service implemented an integrated treatment model known as the dual diagnosis clinician shared care model. This study aims to provide evidence for a relatively unexplored model in clinical mental health services within the state of Victoria, Australia.

Design/methodology/approach

Dual diagnosis clinicians were placed into community mental health clinics in a shared-care, modified case management role, to provide primary and secondary consultations to select consumers and/or their carers, as well as to provide capacity-building training to the mental health staff facing real world clinical challenges in dual diagnosis service delivery.

Findings

Since the commencement of this service, more than 800 consumers of the adult mental health service have been supported to concurrently address their harmful substance use, while receiving recovery-focused community mental health care. Preliminary findings include previously unknown figures on the prevalence for co-occurring substance use at the point of referral and a demonstrated preference by consumers for treatment of both disorders at the same time by the same service (in-house treatment).

Originality/value

The establishment of a dedicated, integrated dual diagnosis team has significantly increased the capacity of a community-based clinical mental health service to engage with and treat consumers with dual diagnosis disorders. This model is beginning to produce evidence challenging traditional siloed approaches to mental health and alcohol and drug treatment.

Recommendations for Integrated Systems and Services for People With Co-occurring Mental Health and Substance Use Conditions

People with co-occurring mental and substance use disorders experience poor outcomes and incur high costs in multiple domains. Efforts to develop and disseminate evidence-based integrated programs for people with such co-occurring disorders began to wane in the past decade as efforts shifted toward integrating primary health care. Several recent trends underscore the need to refocus efforts on providing integrated care for people with both mental and substance use disorders. The authors summarize what is known about integrated care for people with these co-occurring disorders and recommend advancing implementation and research on integration and improving outcomes with existing resources.

Gender Differences in Dual Diagnoses Associated with Cannabis Use: A Review

Gender differences in psychiatric disorders and drug use are well known. Cannabis is the most widely used illegal drug among young people. In recent years, its use has been related to the development of psychiatric pathologies; however, few studies have incorporated the gender perspective as of yet. The present work analyses the literature to determine the existence of gender differences in the development of psychotic, depressive and anxious symptoms associated with cannabis use. First, we describe cannabis misuse and its consequences, paying special attention to adolescent subjects. Second, the main gender differences in psychiatric disorders, such as psychosis, depression, anxiety and cannabis use disorders, are enumerated. Subsequently, we discuss the studies that have evaluated gender differences in the association between cannabis use and the appearance of psychotic, depressive and anxious symptoms; moreover, we consider the possible explanations for the identified gender differences. In conclusion, the studies referred to in this review reveal the existence of gender differences in psychiatric symptoms associated with cannabis use, although the direction of such differences is not always clear. Future research is necessary to discern the causal relationship between cannabis use and the development of psychiatric symptoms, as well as the gender differences found.

Bipolar Disorder and Polysubstance Use Disorder: Sociodemographic and Clinical Correlates

INTRODUCTION

Patients with bipolar disorder (BD) often show comorbidity with substance use disorder (SUD) with a negative impact on clinical course, prognosis, and functioning. The role of polysubstance use disorder (polySUD) is understudied. The aim of the present paper is to evaluate the sociodemographic and clinical characteristics associated with BD and comorbid SUD, focusing on polySUD, in order to phenotype this specific group of patients and implement adequate treatment and prevention strategies.

METHODS

A cross-sectional study was conducted involving 556 patients with a primary diagnosis of BD (376 without SUD, 101 with SUD, and 79 with polySUD). A semi-structured interview was administered to collect sociodemographic variables, clinical characteristics, and pharmacological treatment. ANOVA and chi-square tests were used to compare the three groups. Significantly different variables were then inserted in multivariate logistic regression.

RESULTS

Patients affected by BD and polySUD were younger, and more frequently males and single, than patients with SUD or without SUD. Indeed, the prevalence of patients affected by BD and polySUD living in residential facilities was higher than in the other groups. Moreover, earlier age at onset, higher prevalence of psychotic and residual symptoms, involuntary hospitalization, and a family history of psychiatric disorders were associated with polySUD in patients suffering from BD. Lastly, patients with BD and polySUD were more likely to take four or more medications, particularly benzodiazepines and other drugs. At the multinomial regression, younger age, male gender, early age at onset, psychotic and residual symptoms, positive family history of psychiatric disorders, and use of benzodiazepines remained significantly associated with polySUD in patients with BD.

CONCLUSION

Our findings show a specific profile of patients with BD and polySUD. It is important to conduct research on this topic in order to adopt specific therapeutic strategies, minimize the use of polypharmacy, and aim at full remission and mood stabilization.

Sex differences in behavioral traits related with high sensitivity to the reinforcing effects of cocaine

Cocaine is the most prevalent illegal stimulant drug in Europe among the adult population. Its abuse is characterized by a faster substance abuse disorder (SUD) development than other drugs, with high vulnerability to relapse. However, there does not exist an effective treatment for cocaine dependence. Sex differences have been reported in psychological disorders including SUD. For this reason, it is essential to identify risk factors that predict susceptibility or resilience to cocaine addiction for the development of effective prevention strategies considering sex differences. In the present study, the main objective was to determine more sensitive phenotypes to the conditioned reinforcing effects of cocaine in both sexes. Anxiety-like behavior and the locomotor response to novelty were evaluated in the elevated plus maze, and despair in the tail suspension test, as well as vulnerability traits linked with a high sensitivity to the reinforcing effects of a subthreshold dose of cocaine (1 mg/kg) in the conditioned place preference (CPP) paradigm in male and female mice. Our results indicated that only female mice with high anxiety, low locomotor response to novelty or low despair levels acquired CPP induced by cocaine, while male mice with low anxiety, high locomotor response to novelty or high despair levels presented a higher susceptibility to the rewarding effects of cocaine than others. These sex differences in the results reveal an opposite pattern in males and females on the relationship between anxiety- and depressive-like behaviors and cocaine vulnerability, demonstrating the need to include female mice in preclinical studies.

Psychological and Demographic Determinants of Substance Use and Mental Health During the COVID-19 Pandemic

Background: Alcohol consumption and distress have increased among Canadians since the start of the COVID-19 pandemic. Methods: We examined whether sociodemographic and COVID-19-related worries are associated with various combinations of alcohol consumption and comorbid psychological distress variables among a Canadian sample of adults. Data were derived from a sample of Canadian adults (N = 1,005, 49.6% female) who participated in an online survey in May 2020. Four multivariate ordinal logistic regression models were used to estimate the odds of binge drinking, increased alcohol consumption during the pandemic, and psychological distress. Predictor variables used in the analyses included self-reported sociodemographic characteristics, financial worries, COVID-19 impact on work, and worrying about getting ill. Results: Women were found to have higher odds of increased drinking and anxiety. Also being divorced, separated, or widowed was associated with higher odds of binge drinking and anxiety, and binge drinking and depression. Furthermore, being 60 or older was associated with lower odds of binge drinking and depression and increased drinking and depression, as well as lower odds of increased drinking and depression and increased drinking and anxiety. High income groups were associated with higher odds of binge drinking, increased drinking, and mental distress. Compared to those less worried, being very worried about finances were associated with higher odds of binge drinking and anxiety, increased drinking and anxiety, and increased drinking and depression. Also, being very worried about getting ill with COVID was associated with higher odds of binge drinking and anxiety and increased drinking and anxiety. Conclusion: Our findings identify several demographic and COVID-related worries for increased odds of alcohol intake and co-morbid psychological distress during the COVID-19 pandemic, including identifying as a woman, high income groups, being divorced, separated or widowed, and experiencing financial worries and COVID illness worries. These characteristics should be considered when developing prevention and treatment programs for adults with problematic alcohol use and comorbid anxiety and depression.

Scope, quality and inclusivity of international clinical guidelines on mental health and substance abuse in relation to dual diagnosis, social and community outcomes: a systematic review

OBJECTIVE

It is estimated that up to 75% of patients with severe mental illness (SMI) also have substance use disorder (SUD). The aim of this systematic review was to explore the scope, quality and inclusivity of international clinical guidelines on mental health and/or substance abuse in relation to diagnosis and treatment of co-existing disorders and considerations for wider social and contextual factors in treatment recommendations.

METHOD

A protocol (PROSPERO CRD42020187094) driven systematic review was conducted. A systematic search was undertaken using six databases including MEDLINE, Cochrane Library, EMBASE, PsychInfo from 2010 till June 2020; and webpages of guideline bodies and professional societies. Guideline quality was assessed based on 'Appraisal of Guidelines for Research & Evaluation II' (AGREE II) tool. Data was extracted using a pre-piloted structured data extraction form and synthesized narratively. Reporting was based on PRISMA guideline.

RESULT

A total of 12,644 records were identified. Of these, 21 guidelines were included in this review. Three of the included guidelines were related to coexisting disorders, 11 related to SMI, and 7 guidelines were related to SUD. Seven (out of 18) single disorder guidelines did not adequately recommend the importance of diagnosis or treatment of concurrent disorders despite their high co-prevalence. The majority of the guidelines (n = 15) lacked recommendations for medicines optimisation in accordance with concurrent disorders (SMI or SUD) such as in the context of drug interactions. Social cause and consequence of dual diagnosis such as homelessness and safeguarding and associated referral pathways were sparsely mentioned.

CONCLUSION

Despite very high co-prevalence, clinical guidelines for SUD or SMI tend to have limited considerations for coexisting disorders in diagnosis, treatment and management. There is a need to improve the scope, quality and inclusivity of guidelines to offer person-centred and integrated care.