scholarly journals Glycine attenuates impairments of stimulus-evoked gamma oscillation in the ketamine model of schizophrenia

2021 ◽  
Author(s):  
Moritz Haaf ◽  
Stjepan Curic ◽  
Saskia Steinmann ◽  
Jonas Rauh ◽  
Gregor Leicht ◽  
...  
Keyword(s):  
Clinical Benefit ◽  
Negative Symptoms ◽  
Large Body ◽  
Gamma Band ◽  
Similar Reduction ◽  
Syndrome Scale ◽  
Nmda Receptor Function ◽  
Negative Syndrome ◽  
Gamma Band Oscillations ◽  
The Impact

Although a substantial number of studies suggests some clinical benefit concerning negative symptoms in schizophrenia through the modulation of NMDA-receptor function, none of these approaches achieved clinical approval. Given the large body of evidence concerning glutamatergic dysfunction in a subgroup of patients, biomarkers to identify those with a relevant clinical benefit through glutamatergic modulation are urgently needed. A similar reduction of the early auditory evoked gamma-band response (aeGBR) as found in schizophrenia patients can be observed in healthy subjects in the ketamine-model, which addresses the putative excitation / inhibition (E/I) imbalance of the diseases. Moreover, this change in gamma-band oscillations can be related to the emergence of negative symptoms. Accordingly, this study investigated whether glycine-related increases of the aeGBR accompany an improvement concerning negative symptoms in the ketamine-model. The impact of subanesthetic ketamine doses and the pretreatment with glycine was examined in twenty-four healthy male participants while performing a cognitively demanding aeGBR paradigm with 64-channel electroencephalography. Negative Symptoms were assessed through the Positive and Negative Syndrome Scale (PANSS). Ketamine alone caused a reduction of the aeGBR amplitude associated with more pronounced negative symptoms compared to placebo. Pretreatment with glycine attenuated both, the ketamine-induced alterations of the aeGBR amplitude and the increased PANSS negative scores in glycine-responders, classified based on relative aeGBR increase. Thus, we propose that the aeGBR represents a possible biomarker for negative symptoms in schizophrenia related to insufficient glutamatergic neurotransmission. This would allow to identify patients with negative symptoms, who might benefit from glutamatergic treatment.

Impact of primary negative symptoms on functional outcomes in schizophrenia

2014 ◽  
Vol 29 (7) ◽  
pp. 449-455 ◽  
Author(s):  
G. Fervaha ◽  
G. Foussias ◽  
O. Agid ◽  
G. Remington
Keyword(s):  
Functional Outcomes ◽  
Negative Symptoms ◽  
Depression Scale ◽  
Baseline Visit ◽  
Syndrome Scale ◽  
Quality Of Life Scale ◽  
Life Scale ◽  
Negative Syndrome ◽  
The Impact

AbstractObjectiveNegative symptoms are known to undermine functional outcomes in people with schizophrenia; however, most studies have not accounted for whether these symptoms were primary or secondary to other psychopathological factors. The present study examined the impact of primary negative symptoms on functional outcomes in patients with schizophrenia.MethodThe sample included 1427 patients with schizophrenia who completed the baseline visit in the CATIE study. Symptoms were assessed with the Positive and Negative Syndrome Scale and Calgary Depression Scale, extrapyramidal side effects with the Simpson-Angus scale, and functional status with the Heinrichs-Carpenter Quality of Life Scale.ResultsNegative symptoms were significantly and inversely related to each domain of functioning examined. These relationships remained after statistically controlling for the influence of potential sources of secondary negative symptoms. In addition, the relationships between negative symptoms and specific domains of functioning remained in patients who had mild/absent positive, depressive, anxiety and extrapyramidal symptoms. Negative symptoms were associated with functional outcomes even in antipsychotic-free patients.ConclusionsPrimary negative symptoms significantly contribute to the functional impairment seen in people with schizophrenia. A better understanding of the etiology and pathobiology of these symptoms is required to guide the search for effective therapeutics that promote functional recovery.

Amendment of traditional assessment measures for the negative symptoms of schizophrenia

2018 ◽  
Vol 49 ◽  
pp. 50-55 ◽  
Author(s):  
Aida Farreny ◽  
Judith Usall ◽  
Jorge Cuevas-Esteban ◽  
Susana Ochoa ◽  
Gildas Brébion
Keyword(s):  
Verbal Memory ◽  
Regression Models ◽  
Negative Symptoms ◽  
Linear Regression Models ◽  
Illness Duration ◽  
Traditional Assessment ◽  
Syndrome Scale ◽  
Assessment Measures ◽  
Negative Syndrome ◽  
The Relationship

AbstractSchizophrenia research based on traditional assessment measures for negative symptoms appears to be, to some extent, unreliable. The limitations of the Positive and Negative Syndrome Scale (PANSS) and the Scale for the Assessment of Negative Symptoms (SANS) have been extensively acknowledged and should be taken into account. The aim of this study is to show how the PANSS and the SANS conflate negative symptoms and cognition and to offer alternatives for the limitations found.MethodsA sample of 117 participants with schizophrenia from two independent studies was retrospectively investigated. Linear regression models were computed to explore the effect of negative symptoms and illness duration as predictors of cognitive performance.ResultsFor the PANSS, the item “abstract thinking” accounted for the association between negative symptoms and cognition. For the SANS, the “attention” subscale predicted the performance in verbal memory, but illness duration emerged as a stronger predictor than negative symptoms for outcomes of processing speed, verbal and working memory.ConclusionUtilizing alternative models to the traditional PANSS and SANS formats, and accounting for illness duration, provide more precise evidence on the relationship between negative symptoms and cognition. Since these measures are still extensively utilized, we recommend adopting more rigorous approaches to avoid misleading results.

scholarly journals A Two-Factor Model Better Explains Heterogeneity in Negative Symptoms: Evidence from the Positive and Negative Syndrome Scale

2016 ◽  
Vol 7 ◽  
Author(s):  
Seon-Kyeong Jang ◽  
Hye-Im Choi ◽  
Soohyun Park ◽  
Eunju Jaekal ◽  
Ga-Young Lee ◽  
...  
Keyword(s):  
Negative Symptoms ◽  
Factor Model ◽  
Syndrome Scale ◽  
Negative Syndrome

scholarly journals Brain-Derived Neurotropic Factor Serum Level and Severity Symptom of Bataknese Male Patients with Schizophrenia in North Sumatera, Indonesia

2019 ◽  
Vol 7 (12) ◽  
pp. 1957-1961
Author(s):  
Deasy Hendriati ◽  
Elemeida Effendy ◽  
Mustafa Mahfud Amin ◽  
Vita Camellia ◽  
Muhammad Surya Husada
Keyword(s):  
Serum Level ◽  
Negative Correlation ◽  
Symptom Severity ◽  
Negative Symptoms ◽  
Chronic Schizophrenia ◽  
Serum Levels ◽  
Cross Sectional ◽  
Syndrome Scale ◽  
Male Patients ◽  
Negative Syndrome

BACKGROUND: Schizophrenia is a severe mental disorder that is multi-causative and multi-factor, generally affecting about 1% of the population. The elevation level of brain-derived neurotrophic factor (BDNF) offers several protections from other neurodegenerative processes that occur in schizophrenia since this deficit of neurotrophic factors can contribute to changes in brain structure and function that underlie the schizophrenia psychopathology.AIM: To analyse the correlation between BDNF serum levels and symptom severity by using the Positive and Negative Syndrome Scale (PANSS) instrument in Bataknese male patients with schizophreniaMETHODS: This study was a correlative analytical study with a cross-sectional approach using the Positive and Negative Syndrome Scale (PANSS) instrument to assess symptom severity with 60 subjects of Bataknese male patients with chronic schizophrenia. Moreover, this research was conducted at the Psychiatric Hospital of Prof. Dr M. Ildrem Medan, Indonesia. BDNF serum was analysed with the Quantitative sandwich enzyme immunoassay technique by via Quantikine ELISA Human CXCL8/IL-8 HS. Also, the data analysis was performed through Spearman's correlative bivariate analytics using SPSS software.RESULTS: A negative correlation between the BDNF serum level and the negative scale PANSS score in men with schizophrenia (r = -0.820, p < 0.001) was found. Moreover, there is a negative correlation between BDNF serum levels and PANSS total scores in men with schizophrenia (r = -0.648, p < 0.001)CONCLUSION: BDNF serum level in Bataknese male patients with schizophrenia has a relationship that affects the severity of symptoms in schizophrenic patients, especially for negative symptoms.

scholarly journals Socio Demographic Profile and Risperidone Response in New Versus Old Schizophrenia Patients

2020 ◽  
Vol 18 (1) ◽  
pp. 82-85
Author(s):  
Mohan Belbase ◽  
Jyoti Adhikari
Keyword(s):  
Negative Symptoms ◽  
Total Duration ◽  
P Value ◽  
Base Line ◽  
Age Group ◽  
Old Patients ◽  
Syndrome Scale ◽  
Significant Difference ◽  
The Mean ◽  
Negative Syndrome

Introduction: Schizophrenia is a mental disorder characterized with disorganized thinking, perception, expression of reality with significant social and occupational dysfunction. Two groups of drugs are in recent use namely first generation (typicals) and second generation (atypical) antipsychotics. Risperidone is a broad spectrum antipsychotic and has a role as a first-line agent for first break, mild to moderately ill patients and for severely ill treatment–refractory patients. Aims: This article tries to compare the risperidone response in newly diagnosed schizophrenia patients versus old patients already on some antipsychotics other than risperidone. Methods: This is an experimental intervention study of patients attending to psychiatry OPD and indoor in Nepalgunj Medical College, Kohalpur. Total 40 patients (27 new and 13 old) were selected and sample was collected in one year from January 2018 till December 2018. Positive and negative syndrome scale questionnaire was used to record the positive and negative symptoms of schizophrenia on baseline (week 0). Patients were followed up on week 4 and week 8 and the same positive and negative syndrome scale questionnaire was applied to record the improvement. Risperidone was given in therapeutic dose (4-8mg) on the basis of symptoms and improvement. Results: The study subjects were divided into new N=27 (17 male and 10 female) and old N=13 (7 male and 6 female). Maximum number of schizophrenia cases were in age group 15-25 and 35-44 years comprising 30 % in each group. Mean total duration of illness in new group was 23.89 ± 29.51 months (median being 12.0 months) while in old group it was 123.69 ± 83.34 months (median being 96.0 months) with significant difference between two groups (p= <0.001).The mean risperidone dose in milligram on base line (week 0) was 4.15 ±  0.55 for old group while it was 4.04 ± 0.52 for new group. On week 4, the mean dose for old group was 5.08 ± 0.95 while for the new group it was 4.81 ± 1.08. On week 8, the dose for old group was 6.08 ± 1.32 while it was 5.15 ± 1.35 for new group. There was a significant difference in the drug dose on week 8 between old group and new group with p value of 0.047 (statistically significant).  Conclusion: Our study suggests that schizophrenia is found in most productive age group. Risperidone is  effective in both new and old schizophrenia patients however old patients need higher dose of risperidone than new patients.

scholarly journals Symptom Outcome 1 Year after Admission to an Early Psychosis Program

2003 ◽  
Vol 48 (3) ◽  
pp. 204-207 ◽  
Author(s):  
Jean Addington ◽  
Erin Leriger ◽  
Donald Addington
Keyword(s):  
Negative Symptoms ◽  
Depression Scale ◽  
Early Psychosis ◽  
First Episode ◽  
First Year ◽  
Positive Symptoms ◽  
Syndrome Scale ◽  
Assessment Measures ◽  
Symptom Outcome ◽  
Negative Syndrome

Objective: To determine the change in positive, negative, and depressive symptoms after 1 year in an early psychosis program. Method: One hundred and eighty subjects were included from the first 257 admissions for a first episode of psychosis to a comprehensive early psychosis program. Most had a diagnosis of schizophrenia or schizophreniform disorder. Subjects were assessed on admission to the program and at 3, 6, and 12 months after admission. All 180 subjects completed the 1-year assessment. Assessment measures included the Positive and Negative Syndrome Scale and the Calgary Depression Scale for Schizophrenia. Results: There was a clinically and statistically significant improvement in positive symptoms by 3 months, depression increased at 3 months but significantly improved by 12 months, and negative symptoms changed little over the first year. Conclusions: The differential changes in symptoms in the first year after admission have implications for treatment.

scholarly journals Individual differences in schizophrenia

BJPsych Open ◽  
2017 ◽  
Vol 3 (6) ◽  
pp. 265-273 ◽  
Author(s):  
Edmund T. Rolls ◽  
Wenlian Lu ◽  
Lin Wan ◽  
Hao Yan ◽  
Chuanyue Wang ◽  
...  
Keyword(s):  
Individual Differences ◽  
Antipsychotic Medication ◽  
Negative Symptoms ◽  
Unimodal Distribution ◽  
Multiple Episode ◽  
Syndrome Scale ◽  
Before And After ◽  
Motor Retardation ◽  
Negative Syndrome

BackgroundWhether there are distinct subtypes of schizophrenia is an important issue to advance understanding and treatment of schizophrenia.AimsTo understand and treat individuals with schizophrenia, the aim was to advance understanding of differences between individuals, whether there are discrete subtypes, and how fist-episode patients (FEP) may differ from multiple episode patients (MEP).MethodThese issues were analysed in 687 FEP and 1880 MEP with schizophrenia using the Positive and Negative Syndrome Scale for (PANSS) schizophrenia before and after antipsychotic medication for 6 weeks.ResultsThe seven Negative Symptoms were correlated with each other and with P2 (conceptual disorganisation), G13 (disturbance of volition), and G7 (motor retardation). The main difference between individuals was in the cluster of seven negative symptoms, which had a continuous unimodal distribution. Medication decreased the PANSS scores for all the symptoms, which were similar in the FEP and MEP groups.ConclusionsThe negative symptoms are a major source of individual differences, and there are potential implications for treatment.

Carbonyl stress in schizophrenia

2014 ◽  
Vol 42 (2) ◽  
pp. 468-472 ◽  
Author(s):  
Masanari Itokawa ◽  
Mitsuhiro Miyashita ◽  
Makoto Arai ◽  
Toshio Miyata
Keyword(s):  
Vitamin B6 ◽  
Negative Symptoms ◽  
Therapeutic Agent ◽  
Active Form ◽  
Carbonyl Stress ◽  
Research Approach ◽  
Treatment Resistant ◽  
Syndrome Scale ◽  
Schizophrenic Patients ◽  
Negative Syndrome

We have identified idiopathic carbonyl stress in a subpopulation of schizophrenic patients. We first identified a patient with a mutation in GLO1 (glyoxalase I) who showed increased AGE (advanced glycation end-product) levels and decreased vitamin B6 levels. By applying the observations from this rare case to the general schizophrenic population, we were able to identify a subset of patients (20%) for whom carbonyl stress may represent a causative pathophysiological process. Genetic defects in GLO1 increase the risk of carbonyl stress 5-fold, and the resulting increased AGE levels correlate significantly with PANSS (Positive and Negative Syndrome Scale) scored negative symptoms. Pyridoxamine, an active form of vitamin B6 and scavenger for carbonyl stress, could represent a novel and efficacious therapeutic agent for these treatment-resistant symptoms. In the present article, we describe a unique research approach to identify the causative process in the pathophysiology of a subset of schizophrenia. Our findings could form the basis of a schizophrenia subtype classification within this very heterogeneous disease and ultimately lead to better targeted therapy.

Impact of Empowerment Intervention on Recovery and Symptoms Reduction in People with Schizophrenia

2020 ◽  
Vol 21 (1) ◽  
pp. 56
Author(s):  
Simi Paul ◽  
James Wilson Joseph ◽  
Alok Pratap
Keyword(s):  
Mental Illness ◽  
Intervention Study ◽  
Study Group ◽  
Treatment As Usual ◽  
Central Institute ◽  
Syndrome Scale ◽  
Quasi Experimental ◽  
Recovery Assessment ◽  
Negative Syndrome ◽  
The Impact

Background:Â Around one percent population is affected with Schizophrenia which is a severe mental illness. Typically onset is in late adolescence and remains for a lifetime. Objectives: The current study examined the impact of Empowerment intervention in Schizophrenia. Methods and Materials: This was a quasi-experimental, hospital-based intervention study, used purposive sampling to select 15 patients diagnosed with schizophrenia and admitted in Central Institute of Psychiatry, Ranchi.. Recovery Assessment Scale (RAS), Positive and Negative Syndrome Scale (PANSS) were administered. The study group received 6 sessions of empowerment intervention over a period of one month. Pre-post measurements were taken. Data were analysed using SPSS. Results: Findings suggested significant improvement in personal confidence, willingness, goal, reliance, and positive and negative syndrome than treatment as usual over a period of one month therapy. Conclusion: Empowerment intervention found to be effective in the management of schizophrenia. Findings indicate viable resource and pathways for future development are suggested.

scholarly journals Prevalence and correlates of antipsychotic polypharmacy among outpatients with schizophrenia attending a tertiary psychiatric facility in Nigeria

2016 ◽  
Vol 7 (1) ◽  
pp. 3-10 ◽  
Author(s):  
Nosa Godwin Igbinomwanhia ◽  
Sunday Osasu Olotu ◽  
Bawo Onesirosan James
Keyword(s):  
Psychosocial Functioning ◽  
Side Effect ◽  
Negative Symptoms ◽  
Rating Scale ◽  
Cross Sectional Study ◽  
Global Assessment Of Functioning ◽  
Psychiatric Facility ◽  
Cross Sectional ◽  
Syndrome Scale ◽  
Negative Syndrome

Background: The study aimed to determine the prevalence, pattern and correlates of antipsychotic polypharmacy (APP) among outpatients with schizophrenia attending a tertiary psychiatric facility in Nigeria. Method: A cross-sectional study of 250 patients with schizophrenia attending the outpatient clinic of a regional tertiary psychiatric facility in Nigeria was undertaken. They were administered a sociodemographic questionnaire, the Positive and Negative Syndrome Scale (PANSS), the Global Assessment of Functioning (GAF) scale and the Liverpool University Side Effects Rating Scale (LUNSERS). Results: Of the 250 subjects interviewed, 176 (70.4%) were on APP. APP was significantly associated with higher prescribed chlorpromazine equivalent doses of antipsychotics ( p < 0.001), increased frequency of dosing ( p < 0.001), negative symptoms ( p < 0.01), poorer functioning ( p = 0.04) and greater side-effect burden ( p = 0.04). Conclusion: The APP rate reported from this study is high. Clinicians should be mindful of its impact on dosage and side-effect profiles as APP use is associated with negative symptoms and poor psychosocial functioning.

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