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Query: UMLS:C0036341 (schizophrenia)
 60,220 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Clinical researchers have observed in relatives of schizophrenic individuals abnormal personality traits resembling the psychopathology of schizophrenia. Further similarities have been observed in correlations between measures of brain function, including attention and executive abilities, and these personality psychopathologies. However, two methodologic factors might account for the covariation of these 'schizophrenia spectrum' personality traits and measures of brain function. Clinical selection bias (Berkson's bias) might result in subjects with overlapping conditions being more likely to be studied, and normal personality attributes could affect performance on neurobehavioral tasks. This study investigated relationships between neurobehavioral correlates of schizophrenia, clinical schizophrenia spectrum personality traits, and normal personality dimensions in the five-factor model of personality. To avoid Berkson's bias, subjects expected to have a high probability of spectrum traits were recruited from the Baltimore Epidemiologic Catchment Area Survey community sample. About 40% of the sample were found to have DSM-IIIR Schizotypal, Schizoid, or Paranoid Personality Traits or Disorders. Schizophrenia Spectrum traits showed significant associations with personality dimensions of the five factor model, particularly Openness to Experience and Neuroticism. In ordinary linear regression models, after adjustment for a number of normal personality characteristics, Schizotypal Personality Traits were still strongly associated with perseverative responses on the Wisconsin Card Sorting Test (WCST). In logistic regression models, subjects with Schizotypal, Schizoid, or Paranoid Traits differed in terms of normal personality profiles and WCST performance.
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PMID:Covariance of personality, neurocognition, and schizophrenia spectrum traits in the community. 151 76

To evaluate whether probands from a clinical sample diagnosed as having DSM-III schizotypal and/or paranoid personality disorder have a familial relationship to the schizophrenia-related disorders, the morbid risk for schizophrenia-related disorders and other psychiatric disorders were evaluated in the first-degree relatives of patients with schizotypal and/or paranoid personality disorder and compared with the corresponding risk for these disorders in the first-degree relatives of patients with other non-schizophrenia-related personality disorders. The morbid risk for all schizophrenia-related disorders, and specifically for schizophrenia-related personality disorders, was significantly greater among the relatives of the probands with schizotypal and/or paranoid personality disorder than among the relatives of probands with other personality disorder. The morbid risk for other psychiatric disorders did not differ significantly between the first-degree relatives of the schizotypal/paranoid personality disorder and the other personality disorder control proband samples. These results suggest a specific familial association between schizophrenia-related disorders, particularly schizophrenia-related personality disorders, and clinically diagnosed schizotypal patients.
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PMID:Increased morbid risk for schizophrenia-related disorders in relatives of schizotypal personality disordered patients. 236 Aug 57

Morbidity risks for mental illness were determined in 750 first-degree relatives of chronic schizophrenic and normal control probands. Psychiatric disorders that were more frequent in relatives of schizophrenic probands than in relatives of normal control probands were chronic schizophrenia (5.8% versus 0.6%), schizotypal personality disorder (definite, 14.6% versus 2.1%; probable, 12.1% versus 6.5%), and paranoid personality disorder (7.3% versus 2.3%). The data suggest that schizotypal and paranoid personality disorders are genetically related to schizophrenia. The implications for schizophrenia research are discussed.
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PMID:A family study of schizophrenic and normal control probands: implications for the spectrum concept of schizophrenia. 397 17

This study examines the respective morbid risk for psychiatric illness determined by the family history method in the first-degree relatives of medical controls and patients with delusional disorder (paranoid psychosis) and schizophrenia. The morbid risk for schizophrenia and schizoid-schizotypal personality disorder was significantly greater in the relatives of the schizophrenic patients than in those of the delusional disorder or medical control patients, but no difference in the risk for affective illness or alcoholism was found in the three groups of relatives. Paranoid personality disorder was significantly more common in the relatives of the delusional disorder patients than in those of the medical controls. These results support the familial independence of delusional disorder and schizophrenia.
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PMID:Psychiatric illness in first-degree relatives of patients with paranoid psychosis, schizophrenia and medical illness. 407 47

In this report, modified DSM-III criteria were applied to all the available interviews with adoptees from the greater Copenhagen sample of the Danish Adoption Study of Schizophrenia. In the adoptees, reasonable agreement was found between our DSM-III diagnoses and the original diagnoses using global DSM-II-based criteria by Kety et al for their categories of chronic and acute, but not borderline, schizophrenia. Comparing DSM-III-based diagnoses in adoptees and relatives, schizophrenia, schizotypal personality disorder, and paranoid personality disorder were all significantly more common in the biologic relatives of schizophrenic v screened control adoptees. These three diagnoses, which together form a tentative "schizophrenia spectrum," were also significantly concentrated in the biologic relatives of adoptees with schizoaffective disorder, mainly schizophrenic subtype, and schizotypal personality disorder, but not in biologic relatives of adoptees with schizophreniform disorder or atypical psychosis.
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PMID:An independent analysis of the Danish Adoption Study of Schizophrenia. VI. The relationship between psychiatric disorders as defined by DSM-III in the relatives and adoptees. 673 17

Family studies of schizophrenia frequently include relatives of schizophrenia probands with diagnoses falling within the schizophrenia spectrum. As part of an ongoing genetic linkage study of schizophrenia, the authors examined case material from 50 relatives (of schizophrenia probands) who received a DSM-III-R diagnosis of a nonaffective psychotic disorder or schizotypal or paranoid personality disorder. Eleven exhibited episodic or chronic delusions that resulted in diagnostic dilemmas, often arising from issues pertaining to the classification of delusional phenomena. Four of these cases are presented here. Unusual beliefs were often difficult to classify as odd beliefs versus full delusions, brief/transient versus persistent delusions, bizarre versus non-bizarre delusions. It is suggested that these might be considered continuous rather than dichotomous dimensions. Several possible implications for genetic studies of schizophrenia are discussed.
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PMID:Delusions in schizophrenia spectrum disorders: diagnostic issues. 770 Dec 80

In light of current linkage studies in schizophrenia, research on the "schizophrenia spectrum" deserves increased attention for an exact determination of the affected phenotype: Those disorders that have a much higher prevalence among biological relatives of schizophrenia patients are supposed to share common etiological factors with "core" schizophrenia. However, there is controversy over which of the DSM-III-R personality disorders should be included in the spectrum. In a controlled family study of inpatients with a DSM-III-R diagnosis of schizophrenia (n = 101), schizophreniform and schizoaffective disorders (n = 69), and unipolar major depression (n = 160), familial rates of personality disorders were assessed through personal interviews and compared with prevalence rates in 109 control families from the community. As predicted, schizotypal personality disorder occurred more frequently in the nonpsychotic relatives of schizophrenia probands (2.1%) than in the families of unscreened controls (0.3%). Paranoid personality disorder was more frequent in relatives of probands with unipolar depression (2.9%) than in relatives of schizophrenia patients (1.7%), and controls revealed the lowest rate (0.9%). Schizoid personality disorder, however, was extremely rare in all sample groups (between 0.3% and 0.7%), providing no sufficient statistical power for detection of group differences. Further analysis of the DSM-III-R criterion symptoms of schizotypal personality disorder demonstrated that items describing "negative" symptomatology are the main source of familial aggregation, but "psychotic-like" personality features are also contributing factors.
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PMID:Personality disorders among the relatives of schizophrenia patients. 797 65

This study examines the frequency of DSM-III-R personality disorders in parents of 58 patients who were admitted consecutively to a New York State psychiatric hospital with a first admission for a schizophrenia-like psychosis. For comparison, a control group of 65 families were randomly recruited who were in the same age group and denied any psychiatric history in their immediate families. Significantly more parents of the patients had a diagnosed personality disorder than controls. These were classified as schizoid, schizotypal, histrionic, and sadistic types by DSM-III-R criteria. While paranoid personality disorder was frequent, it was equally distributed among both groups of parents. These data suggest that the genetic boundaries to a "schizophrenia spectrum" disorder may extend further than previously thought and particularly the specific characteristics that are common to a wide variety of these disorders need to be examined in further analyses.
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PMID:DSM-III-R personality disorders in parents of schizophrenic patients. 835 38

The demographic features of 415 patients seeking cosmetic surgery were investigated from a psychiatric point of view. Of the 415 patients, 198 (47.7%) were found to have mental disorders according to ICD-10 including: 17 with schizophrenia, 20 with other persistent delusional disorders, 33 with depressive episode, 47 with neurotic disorders, 42 with hypochondriacal disorder, five with paranoid personality disorder and 14 with histrionic personality disorder. The rate of subjects with poor social adjustment was 56.0%. It was noteworthy that such a considerable number of patients with mental disorders or with poor social adjustment had sought cosmetic surgery. Distinct gender differences were found: male subjects were characterized to have a greater number of mental disorders, especially dysmorphophobia (other persistent delusional disorders plus hypochondriacal disorder) and showed the narrow age range between teenage and young adult age when they were preoccupied with their 'deformity', and poor social function. A history of frequent operations was not considered to be an indicator for mental abnormality. The diagnostic issue in dysmorphophobia is briefly described.
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PMID:Demographic features of patients seeking cosmetic surgery. 968 79

The importance of inheritance in the development of schizophrenia was recorded in classic papers by Kraepelin and Bleuler. These observations have been confirmed by the contemporary research. In this paper, we summarize the results of genetic-epidemiological studies that include family, twin and adoption studies, as well as the results of segregation analysis and molecular-genetic research. Family studies indicate increased morbidity risk in the relatives of patients with schizophrenia, that augments with the degree of relation. Twin studies also suggest the importance of genetic factors demonstrating higher rates of concordance for the disorder in monozygotic (MZ) than in dizygotic (DZ) twins and consistent MZ/DZ ratios across the studies. Adoption studies provide further evidence for genetic vulnerability, showing an association between biological relatives separated at birth. The concept of "schizophrenia spectrum" is based on the observation of the familial aggregation of several hierarchically defined disorders in relatives of schizophrenic probands. Schizophrenia, schizoaffective disorder, schizotypal and paranoid personality disorder, other nonaffective psychoses and psychotic affective disease, according to this concept, represent manifestations of varying severity, of the same underlying vulnerability, which is transmitted within families. The results of segregation analyses support rather polygenic than monogenic inheritance, if schizophrenia is genetically homogeneous. However, the possibility of genetic heterogeneity augments the interest for searching for vulnerability genes with linkage. The results of linkage studies, indicating association between schizophrenia and markers on chromosomes 5, 6, 8 and 22, have not yet been replicated on independent samples of probands. Recent findings indicate that schizophrenia may be caused by unstable DNA (the expansion of trinucleotide repeated sequences at the disease locus). This could explain the departure from Mendelian inheritance, highly variable phenotype and wide ranging age of onset in schizophrenia. Further research in this field could not only clarify the mode of the transmission of the liability for schizophrenia and the relationship of genetic and environmental factors in the development of the disorder, but also determine which characteristics, behavior and physiological variables schizophrenia genes code for. This would, in addition, contribute to our understanding of the biological basis of schizophrenia.
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PMID:[Genetic factors in the onset of schizophrenia]. 1035


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