Unraveling Executive Functioning in Dual Diagnosis

Cognitive impairment as a predictor of long-term psychological distress in patients with polysubstance use disorders: a prospective longitudinal cohort study

BACKGROUND

The association between polysubstance use disorder (pSUD), mental illness, and cognitive impairments is well established and linked to negative outcomes in substance use disorder treatment. However, it remains unclear whether cognitive impairment predicts long-term psychological distress among treatment seeking patients with pSUD. This study aimed to investigate the associations and predictive ability of cognitive impairment on psychological distress one and 5 years after treatment initiation.

METHODS

N = 164 treatment seeking patients with pSUD were sampled at treatment initiation. We examined associations between cognitive impairment according to Montreal Cognitive Assessment® (MoCA®), Wechsler Abbreviated Scale of Intelligence (WASI), and Behaviour Rating Inventory of Executive Function - Adult version (BRIEF-A) administered at treatment initiation and psychological distress defined by the Symptom Check List-90-Revised (SCL-90-R) at treatment initiation, one and five years later. We ran hierarchical logistic regressions to assess the predictive ability of the respective cognitive instruments administered at treatment initiation on psychological distress measured one and five years later including psychological distress at treatment initiation and substance intake at the time-points of the measurements as covariates.

RESULTS

The main results was that MoCA® and BRIEF-A predicted psychological distress at years one and five, but BRIEF-A lost predictive power when accounting for psychological distress at treatment initiation. WASI predicted psychological distress at year one, but not at year five.

CONCLUSIONS

Results from MoCA® and WASI was found to be less sensitive to the effect of psychological distress than BRIEF-A. Cognitive impairment at treatment initiation may hold predictive value on later psychological distress, yet its clinical utility is uncertain.

Neuropsychological functioning of patients with major depression or bipolar disorder comorbid to substance use disorders: A systematic review

Major depression disorder (MDD) and bipolar disorder (BD) are usual comorbidities in patients with substance use disorders (SUD), a condition known as dual disorder (DD). MDD, BD and SUD are associated with cognitive impairment, potentially leading to a greater functional impairment in the context of DD.

OBJECTIVES

To review the existing data on the cognitive impairment in DD patients with comorbid MDD or BD, considering the influence of the depressive symptomatology.

METHODS

Following the PRISMA protocol 19 studies were selected from the last 17 years, 13 of which focused on BD, five on MDD and one included both diagnoses.

RESULTS

Studies based in BD+SUD showed that the most affected cognitive domains were attention and executive functions, but not all of them found a greater impairment due to the comorbidity. While fewer studies were found for depression, MDD+SUD works point to a similar impairment cognitive pattern. Furthermore, depression improvement could be associated to better cognitive performance.

LIMITATIONS

More standardized research is needed regarding the influence of depression on cognitive performance of DD patients, especially on those with comorbid MDD. Factors such as main substance, abstinence, or MDD/BD-related variables should be considered. Unstudied factors, like gender or circadian rhythms, are proposed to improve knowledge in this area.

CONCLUSIONS

Current studies suggest that DD could potentiate cognitive impairment in BD, MDD and SUD. However, additional research is needed to improve the understanding of comorbidity to apply more individualized therapies in the treatment of these patients, considering the interference of their neurocognitive functioning.

Exploring Dual Pathology: Opportunities and Challenges

Exploring Dual Pathology: Opportunities and Challenges

Protocol for Characterization of Addiction and Dual Disorders: Effectiveness of Coadjuvant Chronotherapy in Patients with Partial Response

This protocol aims to characterize patients with dual disorders (DD; comorbid major depression and schizophrenia) compared with patients with only a diagnosis of substance use disorder (SUD) and those with only a diagnosis of severe mental illness (SMI; major depression and schizophrenia), evaluating clinical and personality characteristics, circadian rhythmic functioning, genetic polymorphism and neuropsychological performance in order to obtain a clinical endophenotype of differential vulnerability for these diagnostic entities. Patients will be divided into three groups: DD (45 men with comorbid schizophrenia, 45 men and 30 women with major depression), SUD (n = 90, with a minimum of 30 women) and SMI males (45 with schizophrenia, 45 with major depression). All patients will be under treatment, with at least three months of SUD abstinence and/or with SMI in remission or with stabilized symptoms. Outpatients of both sexes with insufficient restoration of circadian rhythmicity with SUD (n = 30) and dual depression (n = 30) will be asked to participate in a second two-month study, being alternately assigned to the condition of the chronobiological adjuvant approach to the treatment of regular hour habits and exposure to light or to the usual treatment (control). The effect of the intervention and patient compliance will be monitored with a Kronowise KW6® ambulatory device during the first two weeks of treatment and again at weeks 4 and 8 weeks. After completing the evaluation, follow-up of the clinical evolution will be carried out at 3, 6 and 12 months. This project will allow us to analyze the functional impact of DD comorbidity and to develop the first study of chronobiological therapy in the treatment of SUD and dual depression, with results transferable to the clinical setting with cost-effective recommendations for a personalized approach.

Baseline executive functions and receiving cognitive rehabilitation can predict treatment response in people with opioid use disorder

BACKGROUND

Impaired cognitive functions, particularly executive function, predicts poor treatment success in people with substance use disorders. The current study investigated the effect of receiving adjunct cognitive rehabilitation and baseline executive function (EF) measures on treatment response among people with opioid use disorder (OUD).

METHOD

The analysis sample consisted of 113 participants with OUD who were discharged from a compulsory court-mandated methadone maintenance treatment (MMT) and followed for 3 months. We used the Backward digit span/Auditory verbal learning, Stroop, and Trail making tests to assess the three measures of EF, including working memory, inhibition, and shifting, respectively. Treatment response was operationalized as (1) treatment retention and (2) the number of positive urine tests for morphine during 3-month follow-up periods. The study used Cox's proportional hazards model and linear mixed model to identify predictive factors.

RESULTS

Lower Stroop interference scores predicted increased length of stay in treatment (χ² = 33.15, P < 0.001). The linear mixed model showed that scores on auditory verbal learning test and group intervention predicted the number of positive urine tests during a 3-month follow-up.

CONCLUSION

Working memory and inhibitory control, as well as receiving cognitive rehabilitation, could be potentially considered as predictors of treatment response for newly MMT admitted patients with OUD. Assessment of EF before treatment initiation may inform treatment providers about patient's cognitive deficits that may interfere with therapeutic interventions.

When policy fails try something different integrated practice improve outcomes for dual diagnosis co-occurring service users accessing mental health services

Purpose

This paper aims to discuss an initiative developed between, Leicestershire Partnership National Health Service Trust and Turning Point, which is the locally commissioned drug and alcohol service in Leicester, Leicestershire and Rutland. The aim was to improve outcomes for clients with dual diagnosis (co-occurring mental health and substance misuse) issues. The purpose of the change in working practice was to engage with local substance misuse agencies more effectively to improve clinical outcomes within this service user group. This was achieved through four interrelated approaches. This comprising providing an integrated service. It included building relationships with substance misuse services, providing specialist dual diagnosis clinics and the introduction of substance misuse workers onto mental health wards and group work specific to substance misuse. The outcomes included easier access to services for service users and greater uptake of service users who were moving onto substance misuse services. This led to a reduction in risk related to prescribing and fewer incidents related to prescribing changes and greater engagement in services. When service users were moving between services better communication led to prescriptions being transferred with no delay and to reduced dropout rates in service. There was improved access to substance misuse services, more referrals and take up of service taking place. There was a greater understanding by staff of co-occurring substance misuse and how to work with this client group. Closer working relationship with substance misuse services and shared skills led to greater confidence in managing this service user group. This demonstrates a cost effective service that can be replicated within similar settings.

Design/methodology/approach

In clinical practice, shared treatment has proved challenging in light of different service models (Laker, 2006). Substance misuse works on the premise of change comes from the individual, where recovery models in mental health offer a formalised approach. One of the challenges faced by services has been the inability for mental health services to recruit and services become overstretched (Rimmer, 2018); this gave an opportunity for a new method of working to be considered. This led to the development of a new service model.

These changes were:

• Improving the interface with substance misuse services to improve access to community substance misuse services for mental health clients.

• To provide specialist staff within the dual diagnosis field to provide a clinic jointly with local drug and alcohol services.

• Introduction of substance misuse workers as team members on acute mental health and rehab wards.

• Group Substance Misuse programmes.

Findings

Working within an integrated model, yet maintaining separate organisations, by offering joint training and clinics has led to a greater understanding of each organisation’s work and increased engagement within the service user group.The introduction of substance misuse workers to acute and rehab mental health inpatient services encouraged service users to engage at the point of admission and to be referred into locally commissioned substance misuse services prior to the point of discharge. Engagement with staff has demonstrated better engagement with substance service by service users following discharge.For clients able to take leave assessment could take place prior to discharge. This led to an increased uptake in services. Due to no opiate substitution given on discharge decreased risk of prescribed medication overdose at point of discharge and led to increase in returning straight to substance misuse services. This meant that service users received medication quicker and the right dose and on discharge ensured reduced risk. The prescribing of Naloxone at discharge is yet to be assessed, but the risk of an overdose within seven days is well-documented and Naloxone is key in reversing this trend. This change in practice can be replicated in any mental health setting and has increased access to services for those using substances.

Originality/value

Is original no other services have substance workers or joint clinics across the UK. First inpatient unit to welcome patients back post-discharge to attend groups.

Self-Regulation in Dual Diagnosis: A Multi-Method Approach of Self-Awareness, Error-Monitoring and Emotional Distress

Introduction: Self-regulatory actions direct the achievement of life goals. Awareness of one's state is needed to adequately self-regulate one's life.

Methods: The self-regulatory actions of (cognitive/emotional) self-awareness and (error-)monitoring were assessed in patients with Dual Diagnosis and healthy controls. A multi-method approach was applied.

Results: Patients with Dual Diagnosis reported lower capacity to identify, verbalize and interpret emotions in a cognitive manner. Both groups reported experiencing arousal of emotions, but patients showed less cognitive elaboration on them and they reported more negatively labeled emotions. Patients with Dual Diagnosis signaled errors less adequately, but did not differ in the number of errors.

Discussion: The abundance of negative emotions may overwhelm patients and trigger substance use to handle this negativity. Especially because they do in fact experience the arousal of emotions, but they find it harder to timely identify, interpret and verbalize these emotions. Training self-awareness and emotion regulation may be beneficial.

Inhibitory Control and Craving in Dual Disorders and Recurrent Substance Use. Preliminary Findings

Objective: In Dual Disorders (DD), which involves the co-occurrence of a disorder in substance use and a mental disorder, recurrent struggles with addictive behavior are frequent. Neuropsychological knowledge concerning the profile of inhibitory control and the irresistible urge to use substances (craving) within the DD patient group may contribute to the prevention of this recurrent addictive behavior. Methods: Inhibitory control and craving were assessed in 25 patients with DD and 25 healthy controls (HC). Inhibitory control tasks (Go/No-go task and Stop Signal Task) were performed combined with brain measurements (Event Related Potentials) mapping inhibitory control. Moreover, implicit and explicit measures concerning craving were administered. Statistical DD and HC comparisons, correlational and regression analyses on exploratory base were conducted. Results: DD patients committed more inhibitory control errors than HC when confronted with (alcohol) consumption-related picture stimuli. Furthermore, patients with DD showed higher levels of implicit and explicit craving. The number of inhibitory control errors was positively related to levels of implicit and explicit craving. Moreover, explicit craving and impulsivity (as a dimension of inhibitory control) predicted the severity of addictive behavior. Event Related Potential analyses did not show differences in inhibitory control-associated brain activity between DD patients and HC; both groups showed reduction of P300 amplitudes in response to alcohol pictures. Conclusions: Impulsivity and craving are elevated in DD patients and show predictive value for the severity of addictive behavior. One's level of impulsive action tendency may trigger less effort to control (recurrent) substance use. The findings may contribute to existing DD treatment indications by the promotion of impulse control training via "stop-think-act" methods for DD patients.

Impairments in Executive Functioning in Patients with Comorbid Substance Use and Personality Disorders: A Systematic Review

The purpose of this systematic review was to examine the evidence for impaired executive functioning in patients diagnosed with a dual pathology of personality disorder (PD) and substance use disorder, and to identify whether differences exist in comparison to those with a single diagnosis. Methods: A systematic search was conducted to identify studies using measures of executive functioning in patients with PD-substance use disorder dual pathology. Sixteen studies were selected. Results: The results indicate that dual pathology patients with Cluster C personality disorder do not differ from controls, and that the presence of dual pathology does not influence the updating domain of executive functioning. The findings were inconclusive with regard to dual pathology patients with Cluster B personality disorders. Whilst the various studies consistently show that these patients show worse performance than the control groups, here are contradictory results with regard to whether Cluster B personality disorders add more alterations in executive functioning to those that already appear in substance use disorder. Conclusions: The results suggest the need for further research that more adequately controls variables such as time in treatment, medication, and sample size, whilst there is also a need to employ longitudinal designs that include more patients from Clusters A and C.

Risks versus consequences of adolescent and young adult substance use: A focus on executive control

PURPOSE OF REVIEW

This review examines the role of executive control processes in the liability for substance misuse and whether substance use, once initiated, leads to subsequent decrements as proposed by neurotoxicity models of substance use disorder (SUD).

RECENT FINDINGS

As indicated by a number of recent meta-analyses, executive control processes, which include working memory, cognitive flexibility and numerous aspects of attentional, behavioral and emotional control, are impaired in the context of active SUD. Longitudinal studies of behaviorally disinhibited children, individuals with familial risks for SUD, and twins within whom genetic versus environmental influences on behavior can be modeled robustly indicate that relatively poor control is a vulnerability factor for early substance use initiation, binge patterns of use, and subsequent SUD. Evidence of further declines in executive control, once substance use is initiated, is mixed, although a growing number of neuroimaging studies indicate that frontostriatal, frontolimbic, and frontocerebellar systems are altered as a consequence of use.

SUMMARY

Together these patterns suggest strategies for identifying children and adolescents at high risk for SUD, avenues through which substance-related neurotoxicities can be more reliably detected, and the need to structure prevention efforts in a manner that is developmentally appropriate and perhaps personalized to individual vulnerabilities.

Exploring the complex inter-relations between internalising symptoms, executive functioning and alcohol use in young adults

OBJECTIVE

Globally, the prevalence of hazardous drinking peaks in young adulthood, and there is mixed evidence on whether internalising symptoms and executive functioning deficits are associated with this increased risk. This study tested whether internalising symptoms in interaction with executive functioning deficits are associated with high alcohol use disorder symptoms in emerging adulthood, via drinking motives to cope with negative affect and alcohol consumption.

METHOD

An Australian sample of 155 young adults aged 17 to 24 years (M = 20.97, SD = 2.40) provided self-report data on internalising symptom severity and alcohol-related outcomes (n = 155), and neuropsychological data measuring executive functioning (n = 104). Confirmatory factor analyses were conducted to identify two latent variables representing internalising symptoms and executive functions. A series of latent moderated structural equation models and a latent mediated moderation structural equation model examined the inter-relations between internalising symptoms, executive functions and alcohol measures.

RESULTS

High levels of internalising symptoms in interaction with executive functioning deficits were associated with strong drinking motives to cope with negative affect, high past month alcohol consumption and greater alcohol use disorder symptoms. Drinking motives to cope with negative affect and alcohol consumption mediated the relationship between the internalising symptoms and executive functioning latent interaction term with alcohol use disorder symptoms.

CONCLUSIONS

This research highlights greater executive functioning resources are associated with low desires to drink hazardous amounts of alcohol as a maladaptive way to cope with negative feelings among young people. It therefore may be useful to target executive functioning ability alongside internalising symptomology in alcohol prevention and intervention initiatives.

The association of GABRB2 SNPs with cognitive function in schizophrenia

Cognitive impairment is one of the core symptoms of schizophrenia. Multiple domains of cognition are affected in patients with schizophrenia, which has a major effect on the functional outcome. Recent studies indicate that SNPs in the gamma-aminobutyric acid type A receptor beta 2 subunit (GABRB2) gene are associated with the risk of schizophrenia, however, the effect of these SNPs on cognitive function in patients with schizophrenia has not been explored. In this study, we first performed a case-control analysis of three SNPs (rs187269 allele A vs. G, rs252944 allele C vs. G, and rs194072 allele A vs. G) in 100 patients and 90 controls, then conducted a meta-analysis and found the SNP rs194072 was associated with schizophrenia (OR = 0.86, P = 0.0119), and survived after Bonferroni correction. The haplotype analysis suggested that the haplotype ACA, comprising the three SNPs (rs187269, rs252944 and rs194072) was also significantly associated with schizophrenia (P = 0.049).Then, we performed an association analysis of three SNPs (rs187269, rs252944 and rs194072) in GABRB2 gene with cognitive performance in patients with first episode schizophrenia. We found that the allele G of rs187269 in the GABRB2 gene was significantly associated with better cognitive flexibility (P = 0.005), a major aspect of executive function, in patients with first episode schizophrenia. The haplotype ACA was significantly associated with cognitive flexibility in patients with schizophrenia (P = 0.023). Our study showed that SNPs in GABRB2 may have a significant effect on cognitive function in patients with schizophrenia, suggesting that modulating GABRB2 may have therapeutic potential to improve cognitive function of patients with schizophrenia.

Self-Directedness Positively Contributes to Resilience and Quality of Life: Findings From a Mixed Psychiatric Sample

Introduction: This study zoomed into the relation between self-regulation, resilience and quality of life (QOL) within a mixed psychiatric sample of patients with Dual-Diagnosis (DD) or an Autism spectrum disorder (ASD).

Method: Patients with DD or ASD participated and healthy control (HC) data were present. The Barkley Deficits in Executive Functioning Scale (BDEFS), Shortened Temperament and Character Inventory and Manchester Short Assessment of Quality of Life were administered.

Results: The BDEFS revealed more executive problem reporting by DD or ASD patients than by HC. Both patient groups revealed that, the more problems were reported in executive self-regulation (like self-motivation, problem-solving), the lower QOL was experienced. The resilience aspect of self-directedness (goal-directed, responsible attitude) was positively related to higher QOL and to lesser experience of self-motivational and problem-solving problems. But, the more harm-avoidant, the lesser one was self-directed and the more self-motivational and problem-solving problems were reported.

Discussion: Self-regulation and harm-avoidance problems were related to lower QOL in DD and ASD. Self-directedness, executive self-motivation and problem-solving predicted higher QOL. Treatment focus on self-directedness, executive self-regulation and resilience is recommended.

Behavioral predictors of alcohol drinking in a neurodevelopmental rat model of schizophrenia and co-occurring alcohol use disorder

Alcohol use disorder commonly occurs in patients with schizophrenia and contributes greatly to its morbidity. Unfortunately, the neural and behavioral underpinnings of alcohol drinking in these patients are not well understood. In order to begin to understand the cognitive and reward-related changes that may contribute to alcohol drinking, this study was designed to address: 1) latent inhibition; 2) conditioning; and 3) extinction of autoshaping in a neurodevelopmental rat model with relevance to co-occurring schizophrenia and alcohol use disorders, the neonatal ventral hippocampal lesioned (NVHL) rat. NVHL lesions (or sham surgeries) were performed on post-natal day 7 (PND7) and animals were given brief exposure to alcohol during adolescent (PND 28-42). Latent inhibition of autoshaping, conditioning and extinction were assessed between PND 72-90. On PND90 animals were given alcohol again and allowed to establish stable drinking. Latent inhibition of autoshaping was found to be prolonged in the NVHL rats; the NVHL rats pre-exposed to the lever stimulus were slower to acquire autoshaping than sham pre-exposed rats. NVHL rats that were not pre-exposed to the lever stimulus did not differ during conditioning, but were slower to extinguish conditioned responding compared to sham controls. Finally, the NVHL rats from both groups drank significantly more alcohol than sham rats, and the extent of latent inhibition predicted future alcohol intake in the pre-exposed animals. These findings suggest that the latent inhibition of autoshaping procedure can be used to model cognitive- and reward-related dysfunctions in schizophrenia, and these dysfunctions may contribute to the development of co-occurring alcohol use.

Executive Functioning in Men with Schizophrenia and Substance Use Disorders. Influence of Lifetime Suicide Attempts

Background

Lifetime suicide attempts in patients with comorbidity between psychotic disorders and Substance Use Disorder (SUD), known as dual diagnosis, was associated with a worse clinical and cognitive state, poor prognosis and premature death. However, to date no previous study has examined the cognitive performance of these patients considering as independent the presence or absence of lifetime suicide attempts.

Methods

We explore executive functioning differences between suicide attempters and non-attempters in dual schizophrenia (DS) patients and the possible related factors for both executive performance and current suicide risk. Fifty DS male patients in remission of SUD and clinically stables, 24 with and 26 without lifetime suicide attempts, were evaluated. We considered Z scores for all neuropsychological tests and a composite summary score for both premorbid IQ and executive functioning.

Results

DS patients showed low performance in set-shifting, planning and problem solving tasks. Those with suicide attempts presented lower composite summary scores, together with worse problem solving skills and decision-making, compared with non-attempters. However, after controlling for alcohol dependence, only differences in decision-making remained. Executive functioning was related to the premorbid intelligence quotient, and several clinical variables (duration, severity, months of abstinence and relapses of SUD, global functioning and negative symptoms). A relationship between current suicide risk, and first-degree relatives with SUD, insight and positive symptoms was also found.

Conclusions

Our results suggest that problem solving and, especially, decision-making tasks might be sensitive to cognitive impairment of DS patients related to presence of lifetime suicide attempts. The assessment of these executive functions and cognitive remediation therapy when necessary could be beneficial for the effectiveness of treatment in patients with DS. However, further research is needed to expand our findings and overcome some limitations of this study.