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  • 1
    In: Journal of Psychopharmacology, SAGE Publications, Vol. 36, No. 9 ( 2022-09), p. 1051-1060
    Abstract: Evidence from post-mortem studies and in vivo imaging studies suggests there may be reduced N-methyl-d-aspartate receptor (NMDAR) levels in the hippocampus in patients with schizophrenia. Other studies have reported increased glutamate in striatum in schizophrenia patients. It has been hypothesised that NMDAR hypofunction leads to the disinhibition of glutamatergic signalling; however, this has not been tested in vivo. Methods: In this study, we investigated the relationship between hippocampal NMDAR and striatal glutamate using simultaneous positron emission tomography-magnetic resonance (PET-MR) imaging. We recruited 40 volunteers to this cross-sectional study; 21 patients with schizophrenia, all in their first episode of illness, and 19 healthy controls. We measured hippocampal NMDAR availability using the PET ligand [ 18 F]GE179. This was indexed relative to whole brain as the distribution volume ratio (DVR). Striatal glutamatergic indices (glutamate and Glx) were acquired simultaneously, using combined PET-MR proton magnetic resonance spectroscopy ( 1 H-MRS). Results: A total of 33 individuals (15 healthy controls, 18 patients) were included in the analyses (mean (SD) age of controls, 27.31 (4.68) years; mean (SD) age of patients, 24.75 (4.33), 27 male and 6 female). We found an inverse relationship between hippocampal DVR and striatal glutamate levels in people with first-episode psychosis (rho = −0.74, p  〈  0.001) but not in healthy controls (rho = −0.22, p = 0.44). Conclusion: This study show that lower relative NMDAR availability in the hippocampus may drive increased striatal glutamate levels in patients with schizophrenia. Further work is required to determine whether these findings may yield new targets for drug development in schizophrenia.
    Type of Medium: Online Resource
    ISSN: 0269-8811 , 1461-7285
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2022
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  • 2
    In: Psychological Medicine, Cambridge University Press (CUP), Vol. 49, No. 13 ( 2019-10), p. 2186-2196
    Abstract: Converging lines of evidence implicate an important role for the immune system in schizophrenia. Microglia are the resident immune cells of the central nervous system and have many functions including neuroinflammation, axonal guidance and neurotrophic support. We aimed to provide a quantitative review of in vivo PET imaging studies of microglia activation in patients with schizophrenia compared with healthy controls. Methods Demographic, clinical and imaging measures were extracted from each study and meta-analysis was conducted using a random-effects model (Hedge's g ). The difference in 18-kDa translocator protein (TSPO) binding between patients with schizophrenia and healthy controls, as quantified by either binding potential (BP) or volume of distribution ( V T ), was used as the main outcome. Sub-analysis and sensitivity analysis were carried out to investigate the effects of genotype, ligand and illness stage. Results In total, 12 studies comprising 190 patients with schizophrenia and 200 healthy controls met inclusion criteria. There was a significant elevation in tracer binding in schizophrenia patients relative to controls when BP was used as an outcome measure, (Hedge's g = 0.31; p = 0.03) but no significant differences when V T was used (Hedge's g = −0.22; p = 0.29). Conclusions In conclusion, there is evidence for moderate elevations in TSPO tracer binding in grey matter relative to other brain tissue in schizophrenia when using BP as an outcome measure, but no difference when VT is the outcome measure. We discuss the relevance of these findings as well as the methodological issues that may underlie the contrasting difference between these outcomes.
    Type of Medium: Online Resource
    ISSN: 0033-2917 , 1469-8978
    RVK:
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2019
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    SSG: 5,2
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  • 3
    In: The British Journal of Psychiatry, Royal College of Psychiatrists, Vol. 217, No. 2 ( 2020-08), p. 450-457
    Abstract: Heart disease is the leading cause of death in schizophrenia. However, there has been little research directly examining cardiac function in schizophrenia. Aims To investigate cardiac structure and function in individuals with schizophrenia using cardiac magnetic resonance imaging (CMR) after excluding medical and metabolic comorbidity. Method In total, 80 participants underwent CMR to determine biventricular volumes and function and measures of blood pressure, physical activity and glycated haemoglobin levels. Individuals with schizophrenia (‘patients’) and controls were matched for age, gender, ethnicity and body surface area. Results Patients had significantly smaller indexed left ventricular (LV) end-diastolic volume (effect size d = −0.82, P = 0.001), LV end-systolic volume ( d = −0.58, P = 0.02), LV stroke volume ( d = −0.85, P = 0.001), right ventricular (RV) end-diastolic volume ( d = −0.79, P = 0.002), RV end-systolic volume ( d = −0.58, P = 0.02), and RV stroke volume ( d = −0.87, P = 0.001) but unaltered ejection fractions relative to controls. LV concentricity ( d = 0.73, P = 0.003) and septal thickness ( d = 1.13, P 〈 0.001) were significantly larger in the patients. Mean concentricity in patients was above the reference range. The findings were largely unchanged after adjusting for smoking and/or exercise levels and were independent of medication dose and duration. Conclusions Individuals with schizophrenia show evidence of concentric cardiac remodelling compared with healthy controls of a similar age, gender, ethnicity, body surface area and blood pressure, and independent of smoking and activity levels. This could be contributing to the excess cardiovascular mortality observed in schizophrenia. Future studies should investigate the contribution of antipsychotic medication to these changes.
    Type of Medium: Online Resource
    ISSN: 0007-1250 , 1472-1465
    RVK:
    Language: English
    Publisher: Royal College of Psychiatrists
    Publication Date: 2020
    detail.hit.zdb_id: 2021500-9
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  • 4
    In: BJPsych Open, Royal College of Psychiatrists, Vol. 9, No. S1 ( 2023-07), p. S68-S69
    Abstract: Antipsychotic treatment is associated with metabolic disturbance, with clear differences observed between drugs in the adult population. However, the degree to which metabolic alterations occur with different antipsychotics in children and adolescents is unclear. As such, we aimed to compare and rank antipsychotics based on their metabolic and endocrine side-effects when used in the treatment of schizophrenia in this age population. Methods We searched MEDLINE, EMBASE, and PsycINFO from inception until October 30, 2022. We included double blinded, randomised controlled trials comparing 12 antipsychotics and placebo in acute treatment of schizophrenia in individuals aged 〈 18 years. We performed random-effects network meta-analyses to investigate treatment-induced changes in body weight, BMI, total cholesterol, LDL cholesterol, HDL cholesterol, triglycerides, glucose, and prolactin concentrations. We performed meta-regressions to examine the relationship between metabolic/endocrine change and age, sex, and ethnicity Results Of 6697 citations, we included 15 randomised controlled trials, consisting of 2501 patients. Antipsychotics included in analyses were aripiprazole, asenapine, blonanserin, clozapine, haloperidol, lurasidone, molindone, olanzapine, paliperidone, quetiapine, risperidone, and ziprasidone. Median treatment duration was 6 weeks (IQR 6-12). Mean age was 15.13 (SD 0.94) years. Mean differences for weight gain compared with placebo ranged from -2.04 kg (95% CI -4.24 to 0.17) kg for molindone to 4.11 kg (-0.55 to 8.77) for clozapine; for BMI from -0.55 kg/m2 (-1.37 to 0.27) for molindone to 1.92 kg/m2 (0.16 to 3.68) for quetiapine; for total cholesterol from -0.14 mmol/L (-0.70 to 0.41) for risperidone/paliperidone to 0.46 mmol/L (0.00 to 0.90) for quetiapine; for LDL cholesterol from -0.32 mmol (-0.76 to 0.12) for aripiprazole to 0.24 mmol/L (-0.15 to 0.63) for olanzapine; for HDL cholesterol from 0.10 mmol/L (-0.05 to 0.26) for aripiprazole to -0.23 mmol/L (-0.52 to 0.06) for risperidone/paliperidone; for triglycerides from -0.01 mmol/L (-0.21 to 0.34) for molindone to 0.62 mmol/L (0.04 to 1.2) for clozapine; for glucose from -0.33 mmol/L (-0.64 to -0.02) for ziprasidone to 0.81 mmol/L (0.28 to 1.34) for clozapine; for prolactin from -1.92 ng/mL (-15.37 to 11.53) for aripiprazole to 28.10 ng/mL (16.23 to 39.96) for risperidone/paliperidone. Higher baseline age predicted by greater increases in body weight (p = 0.014). Conclusion We found significant differences between antipsychotics in terms of metabolic and endocrine side-effects when used in children and adolescents. Treatment guidelines should be updated to reflect our findings. However, the choice of antipsychotic should be made on an individual basis, considering the clinical circumstances and preferences of young people, carers, and clinicians.
    Type of Medium: Online Resource
    ISSN: 2056-4724
    URL: Issue
    Language: English
    Publisher: Royal College of Psychiatrists
    Publication Date: 2023
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  • 5
    Online Resource
    Online Resource
    British Institute of Radiology ; 2019
    In:  BJR|case reports Vol. 5, No. 3 ( 2019-09), p. 20180104-
    In: BJR|case reports, British Institute of Radiology, Vol. 5, No. 3 ( 2019-09), p. 20180104-
    Abstract: We present a rare case of perineal recurrence of prostate cancer post low dose rate brachytherapy. Increased levels of prostate-specific antigen were recorded 12 years post brachytherapy. Pelvic CT and MRI visualized a nodular lesion in the perineum, and positron emission tomography demonstrated choline-avidity. Ultrasound-guided biopsy of the nodule was performed, yielding histology consistent with prostatic adenocarcinoma. Metastatic prostatic seeding to the perineum is a rare complication of brachytherapy. We discuss the putative mechanism, approach to diagnosis, and management.
    Type of Medium: Online Resource
    ISSN: 2055-7159
    Language: English
    Publisher: British Institute of Radiology
    Publication Date: 2019
    detail.hit.zdb_id: 2912937-0
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  • 6
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2016
    In:  BMC Psychiatry Vol. 16, No. 1 ( 2016-12)
    In: BMC Psychiatry, Springer Science and Business Media LLC, Vol. 16, No. 1 ( 2016-12)
    Type of Medium: Online Resource
    ISSN: 1471-244X
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2016
    detail.hit.zdb_id: 2050438-X
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  • 7
    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
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    SSG: 15,3
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  • 8
    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
    SSG: 15,3
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  • 9
    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
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  • 10
    Online Resource
    Online Resource
    Oxford University Press (OUP) ; 2017
    In:  Schizophrenia Bulletin Vol. 43, No. suppl_1 ( 2017-03-01), p. S80-S80
    In: Schizophrenia Bulletin, Oxford University Press (OUP), Vol. 43, No. suppl_1 ( 2017-03-01), p. S80-S80
    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
    SSG: 15,3
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