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https://www.readbyqxmd.com/read/28634109/cannabis-associated-psychosis-neural-substrate-and-clinical-impact
#1
REVIEW
R M Murray, A Englund, A Abi-Dargham, D Lewis, M Di Forti, C Davies, M Sherif, P McGuire, C D'Souza
Prospective epidemiological studies have consistently demonstrated that cannabis use is associated with an increased subsequent risk of both psychotic symptoms and schizophrenia-like psychoses. Early onset of use, daily use of high-potency cannabis, and synthetic cannabinoids carry the greatest risk. The risk-increasing effects are not explained by shared genetic predisposition between schizophrenia and cannabis use. Experimental studies in healthy humans show that cannabis and its active ingredient, delta-9-tetrahydrocannabinol (THC), can produce transient, dose-dependent, psychotic symptoms, as well as an array of psychosis-relevant behavioral, cognitive and psychophysiological effects; the psychotogenic effects can be ameliorated by cannabidiol (CBD)...
June 17, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28632525/clozapine-safety-and-efficacy-for-interictal-psychotic-disorder-in-pharmacoresistant-epilepsy
#2
Vincent Jetté Pomerleau, François Dubeau, Simon Ducharme
Since the middle of the 19th century, both neurologists and psychiatrists have linked psychosis and epilepsy. Clozapine, the most effective antipsychotic drug, alters electroencephalographic activity and carries a significant risk of causing seizures. Unfortunately, this risk limits the drug's potential use in treating pharmacoresistant psychosis in patients with epilepsy. We present a unique case in which we used clozapine successfully as a last resort treatment for chronic interictal psychosis in a 43-year-old woman with severe pharmacoresistant epilepsy and recurrent status epilepticus...
June 2017: Cognitive and Behavioral Neurology: Official Journal of the Society for Behavioral and Cognitive Neurology
https://www.readbyqxmd.com/read/28629890/perceived-social-stress-and-symptom-severity-among-help-seeking-adolescents-with-versus-without-clinical-high-risk-for-psychosis
#3
Zachary B Millman, Steven C Pitts, Elizabeth Thompson, Emily R Kline, Caroline Demro, Marc J Weintraub, Jordan E DeVylder, Vijay A Mittal, Gloria M Reeves, Jason Schiffman
Research suggests that social stress exposure influences illness presentation and course among youth at clinical high-risk (CHR) for psychosis, though less is known about the extent to which self-reported perceptions of social stress relate to the severity of positive symptoms. Importantly, despite the notion that youth at CHR are especially susceptible to elevations in positive symptoms under conditions of stress, no study has examined this presumption relative to other psychiatric groups. Extending previous work demonstrating that perceived social stress was higher in a CHR group than in a clinical group of non-CHR, help-seeking controls, the current study aimed to: (1) examine whether perceived social stress is related to the severity of attenuated positive symptoms in the full sample (N=110); and (2) determine whether CHR status moderates the stress-symptom relation...
June 16, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28629296/atypical-antipsychotic-use-and-outcomes-in-an-urban-maternal-mental-health-service
#4
Susan Hatters Friedman, Charmian Moller-Olsen, Chandni Prakash, Abigail North
Objective Despite many women suffering from psychosis in their childbearing years, limited data exist about the use of atypical antipsychotic agents in pregnancy. Atypical antipsychotic agents are often used to treat bipolar disorder, instead of lithium or valproate because of the known teratogenicity of those agents. As well, atypical antipsychotics are often prescribed in anxiety disorders and depression. This study sought to describe pregnancy outcomes for women prescribed atypical antipsychotics during pregnancy...
August 2016: International Journal of Psychiatry in Medicine
https://www.readbyqxmd.com/read/28628791/recent-life-events-and-psychosis-the-role-of-childhood-adversities
#5
Giovanni Mansueto, Carlo Faravelli
Life events are commonly reported to be related to psychosis. However, less attention has been given to the role that recent events play on psychosis, in relation to exposure to childhood adversity. The current study aimed to evaluate the relationship between recent events and psychosis, taking into account the role of early adversities. 78 psychotic patients and 156 controls were enrolled. Childhood adversity was evaluated using a validated semi-structured interview and the Childhood Experience of Care and Abuse Questionnaire...
June 13, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28628109/truncating-mutations-in-rbm12-are-associated-with-psychosis
#6
Stacy Steinberg, Steinunn Gudmundsdottir, Gardar Sveinbjornsson, Jaana Suvisaari, Tiina Paunio, Minna Torniainen-Holm, Michael L Frigge, Gudrun A Jonsdottir, Johanna Huttenlocher, Sunna Arnarsdottir, Oddur Ingimarsson, Magnus Haraldsson, Thorarinn Tyrfingsson, Thorgeir E Thorgeirsson, Augustine Kong, Gudmundur L Norddahl, Daniel F Gudbjartsson, Engilbert Sigurdsson, Hreinn Stefansson, Kari Stefansson
Thus far, a handful of highly penetrant mutations conferring risk of psychosis have been discovered. Here we used whole-genome sequencing and long-range phasing to investigate an Icelandic kindred containing ten individuals with psychosis (schizophrenia, schizoaffective disorder or psychotic bipolar disorder). We found that all affected individuals carry RBM12 (RNA-binding-motif protein 12) c.2377G>T (P = 2.2 × 10(-4)), a nonsense mutation that results in the production of a truncated protein lacking a predicted RNA-recognition motif...
June 19, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28622570/the-role-of-premorbid-personality-and-social-cognition-in-suicidal-behaviour-in-first-episode-psychosis-a-one-year-follow-up-study
#7
Manuel Canal-Rivero, J D Lopez-Moriñigo, M L Barrigón, S Perona-Garcelán, C Jimenez-Casado, A S David, J E Obiols-Llandrich, M Ruiz-Veguilla
BACKGROUND: High suicide attempt (SA) rates have been reported in first-episode psychosis (FEP) patients, particularly during the first year after the illness onset. Despite previous studies establishing several risk factors for suicidal behaviour in FEP, premorbid personality and social cognition have not been sufficiently investigated to date. OBJECTIVE: To test whether personality traits and social cognition are associated with SAs in FEP over a 12-month follow-up...
May 31, 2017: Psychiatry Research
https://www.readbyqxmd.com/read/28620812/case-study-of-first-episode-schizophrenia-in-pregnancy-and-postpartum
#8
Kristopher A Kast, Smita Agarkar
Patients with first-episode psychosis of peripartum onset commonly prove to have a mood-disorder diathesis; however, a proportion of cases represent first-episode schizophrenia. We present such a case and discuss the clinical relevance of recognizing this small but important population of new mothers. These patients are at considerable risk of misdiagnosis, resulting in ineffective maintenance therapy, poorer recovery of function, and development of treatment resistance. Accurate diagnosis in the peripartum period will impact treatment decisions and long-term therapy...
June 15, 2017: Archives of Women's Mental Health
https://www.readbyqxmd.com/read/28617565/psychotropic-medications-in-swedish-homicide-victims-and-offenders-a-forensic-toxicological-case-control-study-of-adherence-and-recreational-use
#9
Jonatan Hedlund, Jonas Forsman, Joakim Sturup, Thomas Masterman
OBJECTIVE: We aimed to assess the extent to which adherence to, and recreational use of, psychotropic medications influence the risk of homicide offending and victimization. METHODS: We conducted a population-based case-control study by way of linking a nationwide registry of dispensed prescriptions with a forensic-toxicological database. Homicide victims (n = 200) and offenders (n = 105) were identified for the years 2007-2009 and vehicle-accident controls (n = 1,643) for the years 2006-2013...
June 6, 2017: Journal of Clinical Psychiatry
https://www.readbyqxmd.com/read/28617204/is-the-clinical-high-risk-state-a-valid-concept-retrospective-examination-in-a-first-episode-psychosis-sample
#10
Jai L Shah, Anne Crawford, Sally S Mustafa, Srividya N Iyer, Ridha Joober, Ashok K Malla
OBJECTIVE: One reason for worldwide interest in the clinical high-risk (CHR) state for psychosis is its potential as a target for prevention. However, the feasibility and utility of early intervention initiatives that are focused on this stage involve an untested assumption: that most patients with a first episode of psychosis (FEP) experience earlier CHR symptoms. The objective of this study was to identify and characterize the proportion of FEP patients who had experienced such symptoms prior to the onset of their psychosis...
June 15, 2017: Psychiatric Services: a Journal of the American Psychiatric Association
https://www.readbyqxmd.com/read/28614434/post-stroke-psychosis-how-long-should-we-treat
#11
Maria do Céu Ferreira, Célia Machado, Beatriz Santos, Álvaro Machado
Objective: To describe a rare case of a patient who developed psychotic symptoms after a right stroke that disappeared with antipsychotic treatment, but appears to need low-dose maintenance antipsychotic therapy. Case description: A 65-year-old man presented at the psychiatric emergency service with a history of persistent delusional jealousy, visual illusions and agitation with onset about 1 month after a right posterior cerebral artery ischemic stroke. These symptoms only disappeared with therapeutic dosages of an antipsychotic drug (3 mg/day of risperidone)...
June 12, 2017: Trends in Psychiatry and Psychotherapy
https://www.readbyqxmd.com/read/28613411/outcome-in-patients-converting-to-psychosis-following-a-treated-clinical-high-risk-state
#12
Ashok Malla, Marianne de Bonneville, Jai Shah, Gerald Jordan, Marita Pruessner, Kia Faridi, Mark Rabinovitch, Srividya N Iyer, Ridha Joober
AIM: We explored 2-year outcomes in a sample of clinical high risk (CHR) patients who converted to psychosis despite receiving interventions. METHODS: Of 167 CHR patients, 18 had converted to psychosis and received treatment for their first episode of psychosis in an early intervention service over 2 years. RESULTS: Compared to patients admitted directly to the same early intervention service without having been identified as CHR prior to onset of psychosis, CHR converters were in remission for fewer months (M = 5 vs M = 10); were more likely to be prescribed more than 1 antipsychotic medication (90% vs 68%) and to receive clozapine treatment (38% vs 2%) over 2 years...
June 14, 2017: Early Intervention in Psychiatry
https://www.readbyqxmd.com/read/28612979/research-and-practice-for-ultra-high-risk-for-psychosis-a-national-survey-of-early-intervention-in-psychosis-services-in-england
#13
Helen J Stain, Lauren Mawn, Stephanie Common, Marie Pilton, Andrew Thompson
BACKGROUND: Evidence from meta-analyses of randomized clinical trials show interventions for young people at ultra-high risk (UHR) of developing psychosis are effective both clinically and economically. While research evidence has begun to be integrated into clinical guidelines, there is a lack of research on the implementation of these guidelines. This paper examines service provision for UHR individuals in accordance with current clinical guidelines within the National Health Service (NHS) in England...
June 14, 2017: Early Intervention in Psychiatry
https://www.readbyqxmd.com/read/28608852/risk-of-psychosis-in-refugees-a-literature-review
#14
REVIEW
J Dapunt, U Kluge, A Heinz
Conflicts and precarious living conditions resulted in the arrival of large numbers of refugees in Europe and especially in Germany. Evidence suggests that immigrant populations are at elevated risk of psychotic disorders. Considering the traumatic pre- and post-migratory adversities refugees may have encountered, people granted refugee status may even be more susceptible to psychosis than non-refugee migrants. The aim of this literature review is to summarise and interpret recent research on the incidence or prevalence of psychotic disorders in refugees, additionally focusing on the aspects of gender and Middle Eastern provenance...
June 13, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28607492/cognitive-characterization-of-schizophrenia-risk-variants-involved-in-synaptic-transmission-evidence-of-cacna1c-s-role-in-working-memory
#15
Donna Cosgrove, Omar Mothersill, Kimberley Kendall, Bettina Konte, Denise Harold, Ina Giegling, Annette Hartmann, Alex Richards, Kiran Mantripragada, Michael J Owen, Michael C O'Donovan, Michael Gill, Dan Rujescu, James Walters, Aiden Corvin, Derek W Morris, Gary Donohoe
With >100 common variants associated with schizophrenia risk, establishing their biological significance is a priority. We sought to establish cognitive effects of risk variants at loci implicated in synaptic transmission by (1) identifying GWAS schizophrenia variants whose associated gene function is related to synaptic transmission, and (2) testing for association between these and measures of neurocognitive function. We selected variants, reported in the largest GWAS to date, associated with genes involved in synaptic transmission...
June 13, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28604733/imaging-microglial-activation-in-individuals-at-clinical-high-risk-for-psychosis-an-in-vivo-pet-study-with-18-f-feppa
#16
Sina Hafizi, Tania Da Silva, Cory Gerritsen, Michael Kiang, R Michael Bagby, Ivana Prce, Alan A Wilson, Sylvain Houle, Pablo M Rusjan, Romina Mizrahi
Several lines of evidence implicate microglial activation and abnormal immune response in the etiology of psychosis. Previous positron emission tomography (PET) neuroimaging studies of the translocator protein 18 kDa, TSPO, were limited by low affinity of the first-generation radioligand, low resolution scanners, and small sample sizes. Moreover, there is a dearth of literature on microglial activation in individuals at clinical high risk (CHR) for psychosis. We used a novel second-generation TSPO radioligand, [(18)F]FEPPA, to examine whether microglial activation is elevated in the dorsolateral prefrontal cortex (DLPFC) and hippocampus of antipsychotic-naïve CHR...
June 12, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28603875/impairments-of-spontaneous-and-deliberative-mentalizing-co-occur-yet-dissociate-in-schizophrenia
#17
Robyn Langdon, Michaela Flynn, Emily Connaughton, Martin Brüne
OBJECTIVES: Evidence of impairment in explicit mentalizing in people with schizophrenia has inspired interventions to improve awareness of others' mental states in these individuals. Less is known of implicit mentalizing in schizophrenia, with current findings mixed. We sought to resolve previous inconsistencies using Heider & Simmel's (H&S) classic animation to elicit spontaneous mentalizing and examined relations between spontaneous and deliberative mentalizing. METHODS: Forty-five schizophrenia outpatients and 27 general-community controls completed two explicit theory-of-mind (TOM) tasks and then described the H&S animation (to elicit spontaneous social attributions about emotionally driven, as well as goal-driven, behaviours), before and after an instruction to think of the shapes as people...
June 12, 2017: British Journal of Clinical Psychology
https://www.readbyqxmd.com/read/28603856/a-case-for-motor-network-contributions-to-schizophrenia-symptoms-evidence-from-resting-state-connectivity
#18
Jessica A Bernard, James R M Goen, Ted Maldonado
Though schizophrenia (SCZ) is classically defined based on positive symptoms and the negative symptoms of the disease prove to be debilitating for many patients, motor deficits are often present as well. A growing literature highlights the importance of motor systems and networks in the disease, and it may be the case that dysfunction in motor networks relates to the pathophysiology and etiology of SCZ. To test this and build upon recent work in SCZ and in at-risk populations, we investigated cortical and cerebellar motor functional networks at rest in SCZ and controls using publically available data...
June 12, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28602647/state-marker-properties-of-niacin-skin-sensitivity-in-ultra-high-risk-groups-for-psychosis-an-optical-reflection-spectroscopy-study
#19
Kerstin Langbein, Ulrike Schmidt, Stephan Schack, Natalie J Biesel, Maria Rudzok, G Paul Amminger, Maximus Berger, Heinrich Sauer, Stefan Smesny
Impaired niacin sensitivity (NS) is one of the most replicated findings in untreated schizophrenia, and reflects a disturbance of prostaglandin-mediated pathways in association with deregulated arachidonic acid metabolism, pro-inflammatory activation, and vasomotor function. In ultra-high risk individuals (UHR) increased NS was reported recently, pointing towards dynamic alterations of the underlying pathomechanisms in the period preceding psychosis. However, these characteristics are still unresolved in the diverse UHR groups...
June 8, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28601717/duration-of-untreated-psychosis-illness-and-brain-volume-changes-in-early-psychosis
#20
Charlotte Rapp, Carlos Canela, Erich Studerus, Anna Walter, Jacqueline Aston, Stefan Borgwardt, Anita Riecher-Rössler
The time period during which patients manifest psychotic or unspecific symptoms prior to treatment (duration of untreated psychosis, DUP, and the duration of untreated illness, DUI) has been found to be moderately associated with poor clinical and social outcome. Equivocal evidence exists of an association between DUP/DUI and structural brain abnormalities, such as reduced hippocampus volume (HV), pituitary volume (PV) and grey matter volume (GMV). Thus, the goal of the present work was to examine if DUP and DUI are associated with abnormalities in HV, PV and GMV...
June 3, 2017: Psychiatry Research
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