Publications by authors named "Lieuwe De Haan"

Background: Symptom severity and social functioning are important outcomes after first episode psychosis (FEP), yet current evidence about associations between them is inconsistent and lacks (subclinical) momentary insights.

Methods: The current Ecological Momentary Assessment (EMA) study was conducted in 58 people in remission from FEP, as part of the HAMLETT (Handling Antipsychotic Medication: Long-term Evaluation of Targeted Treatment) trial. At baseline, participants were prompted to report momentary mental states and social context 10x/day for eight consecutive days, including psychotic experiences (PEs), motivation/drive and negative affect, that may indicate proxies of (subclinical) psychotic, negative and general affective symptoms, respectively.

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Background: Almost 40% of individuals at ultra-high risk (UHR) for psychosis experience persistent attenuated psychotic symptoms (APS) yet it is unclear (1) whether they share overlapping clinical and functional outcomes compared to individuals who transition to psychosis, (2) when symptom and functioning trajectories begin to diverge between UHR individuals with different clinical outcomes, and (3) whether non-remission (persistent APS or transition) can be predicted using baseline and/or longitudinal data.

Study Design: Participants were drawn from 2 randomized clinical trials: Neurapro (n = 220; discovery sample) and STEP (n = 180; external validation sample). First, 12-24 month symptoms and functioning were compared between UHR individuals with persistent APS, sustained remission, or transition to psychosis.

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Background: Multiple genetic and environmental risk factors play a role in the development of both schizophrenia-spectrum disorders and affective psychoses. How they act in combination is yet to be clarified.

Methods: We analyzed 573 first episode psychosis cases and 1005 controls, of European ancestry.

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Evidence suggests a worse clinical course in women compared to men with bipolar disorder. However, little research has explored gender differences in the efficacy of anti-manic medication. We sought to determine whether there are gender differences in efficacy of drug treatment in acute manic episodes of bipolar I disorder, and the influence of dichotomized age as a proxy for menopausal status and baseline severity on gender differences.

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Background: The association between cannabis and psychosis is established, but the role of underlying genetics is unclear. We used data from the EU-GEI case-control study and UK Biobank to examine the independent and combined effect of heavy cannabis use and schizophrenia polygenic risk score (PRS) on risk for psychosis.

Methods: Genome-wide association study summary statistics from the Psychiatric Genomics Consortium and the Genomic Psychiatry Cohort were used to calculate schizophrenia and cannabis use disorder (CUD) PRS for 1098 participants from the EU-GEI study and 143600 from the UK Biobank.

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Background: Acceptance and commitment therapy (ACT) is promising in the treatment of early psychosis. Augmenting face-to-face ACT with mobile health ecological momentary interventions may increase its treatment effects and empower clients to take treatment into their own hands.

Objective: This study aimed to investigate and predict treatment engagement with and acceptability of acceptance and commitment therapy in daily life (ACT-DL), a novel ecological momentary intervention for people with an ultrahigh risk state and a first episode of psychosis.

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Background: Recovery from severe mental illness, including psychosis has been described as a personal and unique process, but it rarely is a journey undertaken without profound influences of significant others (family, mental health professionals). Diverging perspectives between persons with severe mental illness, family and professionals are frequent during the recovery process, notably in psychotic disorders. We aimed to explore processes of collaboration during recovery, to inform recovery supporting practices.

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Article Synopsis
  • - The study investigates the link between urban living conditions (urbanicity) and schizotypy, a potential precursor to psychosis, suggesting this relationship varies significantly between North-western and Southern Europe.
  • - Researchers assessed 1080 individuals across 14 sites in both regions, measuring urbanicity through local population density and controlling for factors like age and childhood experiences.
  • - Findings reveal that higher population density is strongly associated with increased schizotypy in North-western Europe, while the effect is notably weaker in Southern Europe, indicating that urbanization’s impact on mental health is not uniform across different contexts.
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Childhood adversity is associated with various clinical dimensions in psychosis; however, how genetic vulnerability shapes the adversity-associated psychopathological signature is yet to be studied. We studied data of 583 First Episode Psychosis (FEP) cases from the EU-GEI FEP case-control study, including Polygenic risk scores for major depressive disorder (MDD-PRS), bipolar disorder (BD-PRS) and schizophrenia (SZ-PRS); childhood adversity measured with the total score of the Childhood Trauma Questionnaire (CTQ); and positive, negative, depressive and manic psychopathological domains from a factor model of transdiagnostic dimensions. Genes and environment interactions were explored as a departure from a multiplicative effect of PRSs and total CTQ on each dimension.

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Negative symptoms can be an integral part of schizophrenia spectrum pathology and can be secondary to other psychotic symptoms or caused by antipsychotic medication. As antipsychotic drugs differ in their affinity to dopamine receptors and some antipsychotics have partial agonistic effects, antipsychotic drugs are expected to vary in their ability to cause negative symptoms. The association between negative symptoms and antipsychotic medication divided into partial agonists, or antagonists with high or low D affinity was assessed in 310 remitted first episode psychosis (FEP) patients.

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Article Synopsis
  • The study investigates how current cannabis use and high-potency cannabis affect DNA methylation patterns in individuals experiencing first-episode psychosis (FEP), comparing them to non-users.
  • Researchers analyzed blood samples from 682 participants, identifying a significant CpG site associated with cannabis use that could influence mental health through epigenetic changes.
  • Findings suggest cannabis use affects genes related to immune and mitochondrial functions, with implications for understanding how cannabis may impact mental health, especially in those with psychosis.
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Background And Hypothesis: Psychotic disorders (PDs) have huge personal and societal impact, and efforts to improve outcomes in patients are continuously needed. Environmental risk factors (ERFs), especially modifiable risk factors, are important to study because they pose a target for intervention and prevention. No studies have investigated ERFs, cognition, and psychotic symptoms together in a network approach.

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Article Synopsis
  • * Data were analyzed from nearly 15,500 patients, revealing that around 15.3% had OCS without OCD, and 16.8% were diagnosed with OCD.
  • * Results indicated that those with comorbid OCS/OCD faced greater challenges in relationships, daily activities, and living conditions, emphasizing the need for proper identification and treatment for these symptoms in this demographic.
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Article Synopsis
  • Researchers tried to create models to predict how well people with first episode psychosis (FEP) would do after treatment, but it was hard to tell if these predictions worked for different groups of patients.
  • They tested these models using patients from two big studies in Europe and found out that while the models were somewhat accurate, they didn't work as well when applied to patients from a different study.
  • The results showed that it’s really important to check and improve these prediction models with independent samples of patients to make them better and more reliable in the future.
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In this meta-analysis, we evaluated changes in cognition for patients with schizophrenia spectrum disorders (SSD) with different durations of illness (DOIs). Records were identified through searches in PubMed, PsycINFO, CINAHL, and Cochrane until December 2021. We used terms related to SSDs, chronicity, course, and recovery.

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Clinical outcomes after a first-episode of psychosis (FEP) are heterogeneous. Many patient-related factors such as gender and comorbidity have been studied to predict symptomatic outcomes. However, psychiatrist-related factors such as prescription behaviour and gender have received little attention.

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The concept of ultra-high risk for psychosis (UHR) has been at the forefront of psychiatric research for several decades, with the ultimate goal of preventing the onset of psychotic disorder in high-risk individuals. Orygen (Melbourne, Australia) has led a range of observational and intervention studies in this clinical population. These datasets have now been integrated into the UHR 1000+ cohort, consisting of a sample of 1,245 UHR individuals with a follow-up period ranging from 1 to 16.

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Background: Patients with bipolar disorder benefit from guidelines recommended continuous community-oriented psychiatric and somatic healthcare, but often discontinue psychiatric care.

Aims: The first objective was to identify predictive factors of discontinuity of psychiatric care among patients who had received psychiatric care. The second objective was to examine if practice variation in discontinuity of psychiatric care existed between providers of psychiatric care.

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Background: Currently, guidance on the most effective treatment for patients with clozapine-resistant schizophrenia-spectrum disorders (SSD) is lacking. While augmentation strategies to clozapine with aripiprazole and electroconvulsive therapy (ECT) have been demonstrated to be effective in patients with clozapine-resistant schizophrenia spectrum disorders (CRS), head-to-head comparisons between these addition strategies are unavailable. We therefore aim to examine the feasibility of a larger randomized, single-blind trial comparing the effectiveness, cost-effectiveness, and safety of aripiprazole addition vs.

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Background And Hypothesis: Cognition has been associated with socio-occupational functioning in individuals at Clinical High Risk for Psychosis (CHR-P). The present study hypothesized that clustering CHR-P participants based on cognitive data could reveal clinically meaningful subtypes.

Study Design: A cohort of 291 CHR-P subjects was recruited through the multicentre EU-GEI high-risk study.

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Clozapine remains the only pharmacological treatment option for treatment-resistant schizophrenia. Therapeutic drug monitoring (TDM) of clozapine is recommended, although evidence for the therapeutic range of 350-600 ng/ml is limited. In various countries including Serbia, TDM of clozapine is not routinely performed.

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Tobacco smoking is highly prevalent among patients with psychosis and associated with worse clinical outcomes. Neurometabolites, such as glutamate and choline, are both implicated in psychosis and tobacco smoking. However, the specific associations between smoking and neurometabolites have yet to be investigated in patients with psychosis.

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Background And Hypothesis: Recovering from a first psychosis is a highly individual process and requires the person to make sense of their experiences. Clinicians, in turn, need to comprehend these first-person perspectives, creating a mutual sense-making dynamic. Antipsychotic medication is a substantial part of psychosis treatment.

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Structural neuroimaging data have been used to compute an estimate of the biological age of the brain (brain-age) which has been associated with other biologically and behaviorally meaningful measures of brain development and aging. The ongoing research interest in brain-age has highlighted the need for robust and publicly available brain-age models pre-trained on data from large samples of healthy individuals. To address this need we have previously released a developmental brain-age model.

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