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  • 1
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 49, No. 4 ( 2023-07-04), p. 962-972
    Abstract: There is limited evidence to guide the approaches to clozapine treatment. Accordingly, an international initiative was undertaken with the aim of developing consensus recommendations for the optimization of clozapine monotherapy. Study Design We conducted an online Delphi survey among members of the Treatment Response and Resistance in Psychosis (TRRIP) working group comprising experts from twenty-nine countries. The threshold criterion for a consensus recommendation was ≥ 75% agreement (“agree” and “strongly agree” responses) on a question. Agreement of ≥ 50% but  & lt; 75% in a second or third Delphi round was deemed to provide guidance. Study Results Forty-nine (first round), 32 (second round), and 48 (third round) of the 91 current TRRIP members participated. Expert recommendations at ≥ 75% comprised second-line treatment with clozapine in cases of persistent positive symptoms with co-occurring extrapyramidal symptoms, tardive dyskinesia, or suicidality/aggression. There was considerable disagreement on myocarditis screening parameters. The management of somatic and neuropsychiatric adverse drug reactions warrants further research for more evidence-based recommendations. Rechallenge with clozapine was recommended for eosinophilia, sinus tachycardia and fever and guidance (agreement ≥ 50%) was reached for pneumonia and thrombocytopenia. Conclusions Given the limited evidence available, this consensus-based series of recommendations and guidance statements supports clinical decision-making to optimize clozapine monotherapy and provides guidance for future research in treatment-resistant schizophrenia.
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2180196-4
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  • 2
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2017
    In:  Schizophrenia Bulletin Vol. 43, No. suppl_1 ( 2017-03-01), p. S3-S4
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 43, No. suppl_1 ( 2017-03-01), p. S3-S4
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2017
    detail.hit.zdb_id: 2180196-4
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  • 3
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 43, No. suppl_1 ( 2017-03-01), p. S142-S143
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2017
    detail.hit.zdb_id: 2180196-4
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  • 4
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 44, No. suppl_1 ( 2018-04-01), p. S395-S395
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2018
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  • 5
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 45, No. 5 ( 2019-09-11), p. 1120-1133
    Abstract: Immune parameters are elevated in psychosis, but it is unclear whether alterations are homogenous across patients or heterogeneity exists, consistent with the hypothesis that immune alterations are specific to a subgroup of patients. To address this, we examine whether antipsychotic-naïve first-episode psychosis patients exhibit greater variability in blood cytokines, C-reactive protein, and white cell counts compared with controls, and if group mean differences persist after adjusting for skewed data and potential confounds. Databases were searched for studies reporting levels of peripheral immune parameters. Means and variances were extracted and analyzed using multivariate meta-analysis of mean and variability of differences. Outcomes were (1) variability in patients relative to controls, indexed by variability ratio (VR) and coefficient of variation ratio (CVR); (2) mean differences indexed by Hedges g; (3) Modal distribution of raw immune parameter data using Hartigan’s unimodality dip test. Thirty-five studies reporting on 1263 patients and 1470 controls were included. Variability of interleukin-6 (IL6) (VR = 0.19), tumor necrosis factor-α (TNFα) (VR = 0.36), interleukin-1β (VR = 0.35), interleukin-4 (VR = 0.55), and interleukin-8 (VR = 0.28) was reduced in patients. Results persisted for IL6 and IL8 after mean-scaling. Ninety-four percent and one hundred percent of raw data were unimodally distributed in psychosis and controls, respectively. Mean levels of IL6 (g = 0.62), TNFα (g = 0.56), interferon-γ (IFNγ) (g = 0.32), transforming growth factor-β (g = 0.53), and interleukin-17 (IL17) (g = 0.48) were elevated in psychosis. Sensitivity analyses indicated this is unlikely explained by confounders for IL6, IFNγ, and IL17. These findings show elevated cytokines in psychosis after accounting for confounds, and that the hypothesis of an immune subgroup is not supported by the variability or modal distribution.
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2019
    detail.hit.zdb_id: 2180196-4
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  • 6
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2018
    In:  Schizophrenia Bulletin Vol. 44, No. suppl_1 ( 2018-04-01), p. S68-S68
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 44, No. suppl_1 ( 2018-04-01), p. S68-S68
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2018
    detail.hit.zdb_id: 2180196-4
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  • 7
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 45, No. Supplement_2 ( 2019-04-09), p. S175-S175
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2019
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  • 8
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 46, No. Supplement_1 ( 2020-05-18), p. S233-S233
    Abstract: Treatment targeting the immune system is a promising new approach in schizophrenia. In search for tools for stratification and treatment monitoring, much effort has been invested in the use of positron emission tomography (PET) and radioligands binding to a glial marker, the 18 kDa translocator protein (TSPO). We previously demonstrated lower TSPO in psychosis patients in an individual participant data (IPD) meta-analysis of studies using second generation TSPO radioligands (Plavén-Sigray et al., 2018). Subsequently, a summary-statistics meta-analysis, including one newly published study, showed no difference (Marques et al., 2019). Here, the aim was to repeat the IPD analysis including this new sample, and an additional unpublished dataset in first episode psychosis patients. The primary objective was to re-evaluate the hypotheses of 1) higher or 2) lower or 3) no difference in radioligand binding between patients and healthy control subjects. Secondary objectives were to assess the effects of antipsychotic medication on TSPO binding, as well as relationships between TSPO binding and disease duration and symptom measures. Methods Individual participant data were obtained from PET studies that 1) used a second generation TSPO radioligand, 2) reported distribution volume (VT) values in brain in patients with psychosis as compared to healthy controls, and 3) reported TSPO affinity type of all participants. The outcome measure was VT in frontal cortex (FC), temporal cortex (TC) and hippocampus (HIP). Bayes factors (BF) were applied to examine the relative support for higher, lower, or no-change of TSPO levels in patients compared to healthy controls. Results Individual participant data from seven studies were included, amounting to 99 patients with first-episode psychosis or schizophrenia and 109 healthy control subjects. In all regions investigated, BF showed moderate to strong support (BF & gt; 5) for lower VT in patients as compared to no difference, and strong support (BF & gt; 10) for lower VT compared to higher VT in patients. Mean patient-control differences in standardized VT values were -0.41 for FC (95%CI -0.67 to -0.15, p = 0.0022), -0.38 for TC (95%CI -0.64 to -0.12, p = 0.0048) and -0.53 for HIP (95% CI -0.79 to -0.27, p = 0.0001). The mean change in standardized VT due to medication was 0.10 for FC (CI95% -0.10 to 0.30, p = 0.615), -0.08 for TC (CI95% -0.32 to 0.48, p = 0.666) and 0.08 for HIP (CI95% -0.46 to 0.30, p = 0.682). No association was observed between VT and disease duration or symptom levels (all p & gt; 0.526). Discussion In this updated IPD meta-analysis including two new datasets, we found moderate to strong support for lower TSPO in psychosis patients compared to control subjects. In vitro data has shown a lack of correspondence between TSPO and pro-inflammatory activation, also recently confirmed in a post-mortem study in schizophrenia. Hence, based on the present results no firm conclusions can be made regarding the pro- versus anti-inflammatory status of glial cells in psychosis patients. Additional work is needed to understand the biological relevance of the observed lower TSPO in patients.
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2180196-4
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  • 9
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2020
    In:  Schizophrenia Bulletin Vol. 46, No. Supplement_1 ( 2020-05-18), p. S12-S13
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 46, No. Supplement_1 ( 2020-05-18), p. S12-S13
    Abstract: The neurobiological mechanisms underlying anhedonia and other negative symptoms in schizophrenia are unknown. Understanding this would help identify treatments for these symptoms. Pre-clinical and human evidence shows the mu-opioid receptor plays a key role in reward processing and anhedonia. However, the contribution of Mu Opioid Receptor (MOR) signalling to negative symptoms and the reward processing abnormalities in schizophrenia is unknown. Here, we investigated for the first time in vivo in patients whether MOR availability is altered in schizophrenia and if this is associated with the neural processes underlying reward anticipation in patients with schizophrenia using multimodal neuroimaging. Methods Forty volunteers (n=20 patients with schizophrenia and 20 age and sex-matched healthy controls) received an [11C]-carfentanil PET scan to measure MOR availability, a structural MRI scan and a functional MRI scan while performing the Monetary Incentive Delay (MID) task to measure the neural response to reward anticipation. All the patients met criteria for persistent negative symptoms. Our primary ROI for the PET analysis was the striatum. In addition, we analysed MOR availability in brain regions in the hedonic network (the striatum, insula and anterior cingulate cortex). The fMRI analysis focused on brain regions in this hedonic network as these have previously associated with MOR mediated reward processing in humans and preclinical studies. Brain volumes of regions of interest (ROIs) were also extracted. Results The analysis showed significantly lower MOR availability in the striatum of patients with schizophrenia relative to controls (patients vs. controls (mean binding potential (BPND) ± SEM): 1.54 ± 0.06 vs. 1.7 ± 0.05, Cohen’s d= 0.7, t=-2.2, df (37), p & lt;0.05). There was also a significant effect of both group (F (5, 222) = 334.5, p & lt;0.05) and ROI (F (1, 222) = 5.65, p & lt;0.05) on BPND measures in the hedonic brain network. The group* ROI interaction was not significant (F (5, 222) = 0.2167, p & gt;0.05). There were no significant differences in the volume of the striatum or other brain regions between groups (patients vs controls: mean ± SEM (mm3) 13019 ± 302 vs 12937 ± 327 respectively, p = 0.86). Reward anticipation in controls was associated with increased neural activation in a widespread network of brain regions including the ventral striatum and insula. The activation in the ventral striatum was significantly lower in patients compared to healthy controls. MOR availability was positively correlated with neural activation in the insula during reward anticipation in controls (spearman’s rho=0.6, p=0.006) but not in patients (spearman’s rho=0.13, p=0.57). In contrast, MOR availability in the striatum was not associated with neural activation in the striatum. Discussion These data show for the first time in vivo that mu-opioid receptor availability is lower in schizophrenia across the hedonic brain network. Moreover, patients with schizophrenia show altered coupling between mu-opioid signalling in the insula and brain activation during reward anticipation. These findings identify the mu-opioid receptor as a potential therapeutic target for reward dysfunction in schizophrenia.
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2180196-4
    SSG: 15,3
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  • 10
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 46, No. Supplement_1 ( 2020-05-18), p. S261-S262
    Abstract: Antipsychotic treatment is associated with metabolic disturbance. However, the relative degree to which metabolic alterations occur in treatment with different antipsychotics remains unclear. Furthermore, predictors of metabolic dysregulation are poorly understood, and association between metabolic-change and change in psychopathology is uncertain. Methods We searched Medline, EMBASE and PsychINFO from inception until June 30, 2019. We included blinded randomised controlled trials (RCTs) comparing 18 antipsychotics and placebo in acute-treatment of schizophrenia. We performed frequentist random-effects network meta-analyses (NMAs) to investigate treatment-induced changes in body weight, BMI, total/LDL/HDL-cholesterol, triglycerides, and glucose. We performed meta-regressions to examine relationships between metabolic change and age/gender/ethnicity/baseline-weight/baseline-metabolic parameter level. We examined the association between metabolic change and psychopathology change by estimating the correlation between symptom severity change and metabolic parameter change. Results Of 6532 citations, 100 RCTs met inclusion criteria, including 25,952 patients. Median treatment-duration was 6-weeks. According to our NMAs, mean differences for weight-gain compared to placebo ranged from -0.23 (95% CI: -0.83, 0.36) for best (haloperidol) to +3.01kg (1.78, 4.24) for worst (clozapine); for BMI from -0.25 (-0.68, 0.17) for best (haloperidol) to +1.07kg/m2 (0.90, 1.25) for worst (olanzapine); for total-cholesterol from -0.09 (-0.24, 0.07) for best (cariprazine) to +0.56mmol/L (0.26, 0.86) for worst (clozapine); for LDL-cholesterol from -0.13 (-0.21, -0.05) for best (cariprazine) to +0.20mmol/L (0.14, 0.26) for worst (olanzapine); for HDL-cholesterol from +0.05 (0.00, 0.10) for best (brexpiprazole) to -0.10mmol/L (-0.33, 0.14) for worst (amisulpride); for triglycerides from -0.01 (-0.10, 0.08) for best (brexpiprazole) to +0.98mmol/L (0.48, 1.49) for worst (clozapine); for glucose from -0.29 (-0.55, -0.03) for best (lurasidone) to 1.05mmol/L (0.41, 1.70) for worst (clozapine). Greater increases in glucose were predicted by higher baseline-weight (p=0.001) and male-gender (p=0.008). Non-Caucasian ethnicity was associated with greater increases in total-cholesterol (p=0.04). Improvements in symptom severity were associated with increases in weight (rho=0.36, p=0.002), BMI (rho=0.84, p & lt;0.0001), total-cholesterol (rho=0.31, p & lt;0.05), and LDL-cholesterol (rho=0.42, p=0.01), and decreases in HDL-cholesterol (rho= -0.35, p=0.04). Discussion There are marked differences between antipsychotics in terms of metabolic side-effects, with olanzapine and clozapine exhibiting the worst profiles. By contrast, compared with placebo, lurasidone and cariprazine respectively reduce fasting glucose and LDL-cholesterol, while aripiprazole and brexpiprazole increase HDL-cholesterol. Baseline weight, male gender, and non-Caucasian ethnicity predict vulnerability to antipsychotic-induced metabolic change. Considering the increased prevalence of metabolic syndrome, cardiovascular disease, and cardiovascular mortality in schizophrenia, these data may be used to inform antipsychotic-prescribing, especially in those at-risk groups we have identified. However, clinical decisions to preferentially use an antipsychotic with fewer metabolic side effects should consider that clinical improvement appears to be associated with development of these side effects.
    Type of Medium: Online Resource
    ISSN: 0586-7614 , 1745-1701
    RVK:
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2180196-4
    SSG: 15,3
    Location Call Number Limitation Availability
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