Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UMLS:C0036341 (schizophrenia)
 60,220 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Psychotic features are frequent in combat veterans with chronic posttraumatic stress disorder (PTSD), may correlate with severity of PTSD symptoms, and may reflect a distinct subtype of the disorder. These psychotic features include auditory and visual hallucinations and delusional thinking that is usually paranoid in nature. Psychotic features may be under-recognized in chronic PTSD because patients are reluctant to report these symptoms and because they may not have overt changes in affect or bizarre delusions characteristic of other psychoses, e.g., schizophrenia. To further assess these phenomena, we compared clinical ratings on the Positive and Negative Syndrome Scale (PANSS) and other assessments, including the Clinical Global Impression Scale and the Structured Clinical Interview with Psychotic Screen, in veterans meeting DSM-IV criteria for chronic PTSD with well-defined comorbid psychotic features (N = 40) or chronic schizophrenia (N = 40). The patients with schizophrenia had modestly higher composite PANSS scores and positive symptom scores although average scores in both groups were moderate to severe in intensity. Negative symptom and general psychopathology subscale scores were comparable in both groups. Regarding specific positive symptoms, hallucinations were comparable between groups in severity; however, schizophrenia patients had slightly more intense delusions and conceptual disorganization. These data further validate the occurrence of positive as well as negative symptoms of psychosis in chronic PTSD in a range of severity that may approach that of patients with schizophrenia. Although meeting DSM-IV criteria for two different major psychiatric disorders, these two patient populations were remarkably similar with respect to not only positive but also negative symptoms.
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PMID:Psychotic features in chronic posttraumatic stress disorder and schizophrenia: comparative severity. 1078 98

There have been long questions about the relationship of schizophrenia to other mental disorders. Lifetime DSM-III-R diagnoses of mood and anxiety disorders in twins with clinically diagnosed schizophrenia (n = 24) and their non-affected co-twins (n = 24) were compared with twins from pairs without schizophrenia (n = 3327) using a sample from the Vietnam Era Twin Registry. Schizophrenic probands had significantly elevated rates of all included disorders (bipolar disorder, major depression, dysthymia, generalized anxiety disorder, panic disorder, and PTSD) compared with controls (P<0.01). The odd ratios comparing co-twins of schizophrenic probands with controls was greater than three for every disorder, but did not attain statistical significance. A similar pattern was observed when analyses were restricted to only monozygotic twins (n = 12). Consistent with other studies, schizophrenics appeared to have higher rates of a range of mental disorders. Our results suggest that schizophrenia per se represents a risk factor for other psychiatric disorders, but the absence of significantly elevated risk among non-schizophrenic co-twins suggested that family environmental and/or genetic factors that contribute to risk of schizophrenia do not increase the risk of mood and anxiety disorders to the same extent that the risk of these other disorders is increased by the presence of schizophrenia.
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PMID:Lifetime prevalence of mood and anxiety disorders in twin pairs discordant for schizophrenia. 1080 38

Neurologic, psychiatric and psychophysiologic (computed EEG) examinations were carried out in 100 Chernobyl accident's survivors who had got acute radiation sickness (ARS), in 100 Chernobyl liquidators who worked for 5 or more years in the zone (1986-1987) as well as in control groups: 20 normal age- and gender-matched adults and 50 veterans of the Afganistan war with consequences of the posttraumatic stress disorder (PTSD) and 50 veterans with both PTSD and mild closed head injury. Left-hemispheric cortical-limbic and diencephalic right-hemispheric syndromes were revealed. Left-hemispheric frontal-temporal-limbic dysfunction was associated with schizophrenia-like syndrome, while diencephalic right-hemispheric dysfunction--with the affective syndrome. Doses more than 0.3 Sv (including the ARS-patients) resulted more frequently in the left-hemispheric cortical-limbic and schizophrenia-like syndromes. Diencephalic right-hemispheric and affective syndromes were more frequently observed after the exposure to doses less [corrected] than 0.3 Sv. Development of schizophrenia spectrum disorders in the irradiated Chernobyl survivors could be due to radiation-induced left fronto-temporal-limbic dysfunction following irradiation doses more than 0.3 Sv (including the ARS-patients). The cerebral patterns of schizophrenia and postradiation brain damage are similar. Persons exposed fo 0.3 Sv and more could be classified as the group of higher risk of the development of schizophrenia spectrum disorders. The authors suggest that ionizing radiation may be an environmental trigger factor which can cause schizophrenia in the predisposed subjects.
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PMID:[Neurological and psychopathological syndromes in the follow-up period after exposure to ionizing radiation]. 1081 65

The occurrence of multiple diagnoses in one patient is a phenomenon of major clinical and theoretical importance. This paper reviews the various factors involved in real and artifactual comorbidity. Important causes of spurious comorbidity are discussed, including invalidity of the individual diagnoses, use of inappropriate diagnostic paradigms, descriptive overlap of diagnostic criteria, ascertainment bias, and diagnostic bias. To illustrate some of the concepts discussed, two examples are presented: the comorbidity of schizophrenia and substance use disorders, and the comorbidity of posttraumatic stress disorder and major depression. The study of comorbidity can advance psychiatry by helping us to clarify our thinking about categories of illness and the boundaries between them, as well as the relationships among these categories.
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PMID:Theoretical and methodological issues in psychiatric comorbidity. 1082 94

Transcranial Magnetic Stimulation (TMS) is a safe noninvasive technique to modulate cortical excitability. The introduction of repetitive TMS (rTMS) provides a new tool for studying psychopathologic disorders and higher cognitive functions. One of the most salient potential effects of rTMS is its possible therapeutic effect on different psychiatric disorders like depression, mania, obsessive compulsive disorder, post-traumatic stress disorder and schizophrenia. The mechanisms by which exerts its therapeutic effects are still unknown. However, the combination of this new methodology with functional neuroimaging techniques may help clarify what cerebral dysfunctions underly certain psychiatric conditions at the same time that it provides novel insights into brain cortico-cortical and cortico-subcortical connectivity.
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PMID:[Transcranial magnetic stimulation: contribution to psychiatry and to the study of brain-behavior relationship]. 1093 94

Rorschach protocols from 35 children and adolescents with posttraumatic stress disorder (PTSD) and 35 with oppositional defiant disorder (ODD) were compared. Both groups revealed significant differences from the normative tables on the same 12 variables: SCZI, DEPI, CDI, X + %, EgoC, Afr, T, EA, P, WSumC, RawSumSS, and WgtSumSS. However, as predicted, 4 of those variables, the Schizophrenic Index (SCZI) and 3 of the criterion tests that comprise it (X + %, RawSumSS, and WgtSumSS) were significantly different between the PTSD and ODD groups, with the PTSD group responding with more extreme scores. These findings contradict Exner's (1993) statement that only people with schizophrenia can be "defined or conceptualized as having both the problems of disordered thinking and inaccurate perception" (p. 356). Children and adolescents with PTSD also display these problems when trauma interrupts the child's naive belief that the world has predictable rules, the people in it are trustworthy and fair, and punishment and pain are consequences of bad behavior. When young victims cannot comprehend or make sense of what has happened to them, life becomes irrational, illogical, and confusing. Exner's SCZI does what it was designed to do: identify individuals with disordered thinking and inaccurate perception. Therefore, SCZI should be renamed the Perception and Thinking Index (PATI) to reflect its function rather than a diagnostic category.
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PMID:Rorschach protocols from children and adolescents diagnosed with posttraumatic stress disorder. 1094 6

Over the past two decades there has been a growing awareness of the comorbidity between post-traumatic stress disorder (PTSD) and substance use disorders in the general population. The purpose of these analyses was to examine, in a population of drug users, the role of gender in (1) predicting the nature of the traumatic event and PTSD symptoms, (2) patterns of substance use disorders in relation to trauma exposure and PTSD symptoms, (3) comorbidity of other psychiatric disorders with trauma exposure and PTSD, and (4) the temporal association of substance use disorder, exposure to trauma, and PTSD. Drug abusers (n = 464) were interviewed using the Diagnostic Interview Schedule for DSM-III-R (DIS) and the Composite International Diagnostic Interview-Substance Abuse Module (CIDI-SAM). Although more women than men met criteria for DSM-III-R PTSD, there were no gender differences on endorsement for a traumatic event. Adult antisocial behavior, affective disorder, schizophrenia, other anxiety disorder and polysubstance use predicted exposure to an event, whereas, only schizophrenia and other anxiety disorder predicted PTSD. In men, drug use preceded the exposure to an event, while in women, the onset age for both drug use and exposure to an event were nearly identical. This work suggests implications for gender-based education and prevention interventions.
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PMID:Gender differences in risk factors for trauma exposure and post-traumatic stress disorder among inner-city drug abusers in and out of treatment. 1124 46

The TaqIA D2 dopamine receptor (DRD2) minor (A1) allele was first associated with severe alcoholism a decade ago. Since then, studies both confirming and not confirmnning this finding were reported. However, a meta-analysis of a large number of Caucasian alcoholics (both more severe and less severe) and controls (both assessed and unassessed for substance use disorders) revealed a significantly higher frequency (p < 10(-6)) and prevalence (p < 10(-8)) of the DRD2 A1 allele in the alcoholics. Further analysis showed that the more severe alcoholics had a 3-fold higher prevalence of the DRD2 A1 allele than the assessed controls (p < 10(-10)), whereas no difference was found between the less severe alcoholics and the unassessed controls. DRD2 exonic or promoter mutations have not yet been associated with alcoholism, although two intronic variants at the TaqIB and intron 6 sites, which are in linkage disequilibrium with the TaqIA site, were associated with this disorder. Variants of the DRD2 gene have also been associated with cocaine, nicotine and opioid dependence, obesity and gambling. It is hypothesised that the DRD2 is a reinforcement or reward gene. Although less intensively studied than substance use disorders, the DRD2 gene has been implicated in Tourette's syndrome (TS), post-traumatic stress disorder (PTSD) and certain symptoms associated with affective disorders and schizophrenia. Further, DRD2 variants have been implicated in Parkinson's disease (PD) and in iatrogenically-induced movement disorders, as well as in certain migraineurs. Phenotypic differences have been associated with DRD2 variants. These include reduced D2 dopamine receptor numbers and diminished glucose metabolism in the brain of subjects who carry the DRD2 A1 allele. In addition, phenotypic differences have been found in neurocognitive and personality characteristics, and in treatment outcome of DRD2 variants. The involvement of the DRD2 gene in certain neuropsychiatric disorders opens up the potential of a targeted pharmacogenomic approach to the prevention and treatment of these disorders.
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PMID:The DRD2 gene in psychiatric and neurological disorders and its phenotypes. 1125 81

As many World War II and Korean Conflict veterans suffering from posttraumatic stress disorder (PTSD) grow older, increasing numbers will be diagnosed with dementia. We retrospectively analyzed patients with dementia, comparing the behavioral disturbances of those with PTSD to those without PTSD. We hypothesized that due to the additive effect of the neurobiological and behavioral changes associated with PTSD and dementia, the dementia with PTSD group would show more agitation and disinhibition than the dementia without PTSD group. Sixteen patients with diagnoses of dementia and PTSD were matched on age and Mini-Mental States Examination (MMSE) scores to 16 patients with dementia without PTSD. Demographic characteristics, co-morbid diagnoses, global Assessment of Functioning (GAF), Cohen-Mansfield Agitation Inventory (CMAI), and paranoid items of Brief Psychiatric Rating Scale (BPRS) and Positive and Negative Syndrome Scale for Schizophrenia (PANSS) were assessed. The patients with diagnoses of dementia with PTSD did not differ significantly in their clinical presentation, hospital course, and condition at discharge from patients with dementia without PTSD. Chi-square analysis showed that significantly more subjects in the PTSD group were prescribed anti-depressants compared to the non-PTSD group. Interestingly, within the PTSD group, the subgroup of patients who were former prisoners of war had a significantly higher mean score for paranoia and significantly less verbal agitation. This pilot study reveals that a diagnosis of PTSD alone is not sufficient to influence behavior in veterans with dementia; however, we also present provocative results that patients with more severe trauma (POW) do have changes in their behavior.
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PMID:Contribution of PTSD/POW history to behavioral disturbances in dementia. 1133 21

Potential therapeutic properties of repetitive transcranial magnetic stimulation (rTMS) have been suggested in several psychiatric disorders such as depression, mania, obsessive-compulsive disorder, posttraumatic stress disorder and schizophrenia. By inducing electric currents in brain tissue via a time-varying strong magnetic field, rTMS has the potential to either directly or trans-synaptically modulate neuronal circuits thought to be dysfunctional in these psychiatric disorders. However, in order to optimize rTMS for therapeutic use, it is necessary to understand the neurobiological mechanisms involved, particularly the nature of the changes induced and the brain regions affected. Compared to the growing number of clinical studies on its putative therapeutic properties, the studies on the basic mechanisms of rTMS are surprisingly scarce. rTMS currently still awaits clinical routine administration although,there is compelling evidence that it causes changes in neuronal circuits as reflected by behavioural changes and decreases in the activity of the hypothalamic-pituitary-adrenocortical system. Both alterations suggest regional changes in neurotransmitter/neuromodulator release, transsynaptic efficiency, signaling pathways and in gene transcription. Together, these changes are, in part, reminiscent of those accompanying antidepressant drugs.
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PMID:Transcranial magnetic stimulation as a therapeutic tool in psychiatry: what do we know about the neurobiological mechanisms? 1157 38


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