The fractal box dimension on human eyeball movement—objective, biological marker of schizophrenia?

2004 ◽  
Vol 19 (8) ◽  
pp. 514-515
Author(s):  
Tomasz Kleszczewski ◽  
Wiesław Rutkiewicz
Keyword(s):  
Biological Marker ◽  
Fractal Property ◽  
Control Group ◽  
Box Dimension ◽  
Schizophrenic Patients ◽  
Normal Controls

AbstractThe authors developed a method of measuring the fractal box dimension of the human eyeball movement.We found a fractal property in schizophrenic subjects (n = 20) and normal controls (n = 20). The value of the fractal box dimension for schizophrenic patients differs from the results obtained in the control group.

The self and schizophrenia: a cognitive approach

2003 ◽  
Vol 62 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Marek Nieznanski
Keyword(s):  
Normal Subjects ◽  
Control Group ◽  
Cognitive Approach ◽  
Schizophrenic Patients ◽  
Self Schema ◽  
Persons With Schizophrenia ◽  
Basic Features ◽  
Trait Words ◽  
Patients Experience ◽  
Normal Controls

The aim of the study was to explore the basic features of self-schema in persons with schizophrenia. Thirty two schizophrenic patients and 32 normal controls were asked to select personality trait words from a check-list that described themselves, themselves as they were five years ago, and what most people are like. Compared with the control group, participants from the experimental group chose significantly more adjectives that were common to descriptions of self and others, and significantly less that were common to self and past-self descriptions. These results suggest that schizophrenic patients experience their personality as changing over time much more than do healthy subjects. Moreover, their self-representation seems to be less differentiated from others-representation and less clearly defined than in normal subjects.

Gene Frequency of CYP2D6*4 and *10 Variants in Karachi Population

2020 ◽  
Vol 17 ◽  
Author(s):  
Tamkeen Fatima ◽  
Farah Zeb ◽  
A. Dar Farooq
Keyword(s):  
Antipsychotic Drugs ◽  
Screening Program ◽  
Restriction Enzymes ◽  
Normal Subjects ◽  
Control Group ◽  
Poor Metabolizer ◽  
Cyp2d6 Polymorphism ◽  
Wild Allele ◽  
Schizophrenic Patients ◽  
Intermediate Metabolizer

Background: CYP2D6 is to be considered the most pronounced gene in pharmacegenetic field which is involved in metabolizing ~25% of all clinically used neuroleptic drugs and other antidepressants. We designed a study to evaluate differential expression of CYP2D6*4 and CYP2D6*10 variants which are very prevalent in Asian countries and exhibit variation in drug metabolizing ability that affect therapeutic responses. Objective: The purpose of this study is to determine the genotypic frequencies of CYP2D6 *1 (normal metabolizer), *4 (poor metabolizer) and *10 (intermediate metabolizer) variants among schizophrenic subjects and compared with control group from a sub-set of Karachi population. Method: Genomic deoxyribonucleic acid (DNA ) was extracted and amplified with CYP2D6*4 and *10 primers using polymerase chain reaction (PCR) and digested by Bacillus stereothermophilus (BstN1) and Hemophilus parahemolyticus (Hph1) restriction enzymes. The digested bands were identified as wild type or mutants and their genotypic frequencies were estimated statistically by Hardy-Weinberg equation (HWE) and analyzed further under non-parametric Chi-square test. Results: The results mentioned the frequencies of CYP2D6*1 wild allele (57%) which produces functional enzyme in normal subjects but CYP2D6*4 variant (9%) that produces non-functional enzyme and CYP2D6*10 allele (70%) produces altered enzyme with reduced activity that was most prevalent in schizophrenic patients. Conclusion : Genotyping of CYP2D6 alleles among schizophrenic patients indicated prevalence of *4 and *10 variants in Karachi population producing non-functional and reduced functional drugs metabolizing enzymes respectively that increases the incurability rate of schizophrenia. Therefore, CYP2D6 gene screening program should be conducted routinely in clinical practice to help clinicians to prescribing appropriate doses according to patient’s genotype and minimize the sufferings of schizophrenia. Discussion: In last, drug response is a complex phenomenon that is dependent on genetic and environmental factors. CYP2D6 polymorphism may un-cured the schizophrenia due to improper drug metabolism and protein-proteins interaction that may alter the antipsychotic drugs metabolism among patients with variable drug resposes. Gene testing system need to establish for analyzing maximum patient’s genotypes predicted with poor metabolizer, intermediate metabolizer and ultrarapid metabolizer for the adjustment of antipsychotic drugs.

The clinical relevance of isolated lupus anticoagulant positivity in patients with thrombotic antiphospholipid syndrome

2020 ◽  
Author(s):  
Dong-mei Yin ◽  
Philip de Groot ◽  
Marisa Ninivaggi ◽  
Katrien M.J. Devreese ◽  
Bas de Laat
Keyword(s):  
Antiphospholipid Syndrome ◽  
Clinical Relevance ◽  
Antiphospholipid Antibodies ◽  
Odds Ratio ◽  
Lupus Anticoagulant ◽  
Solid Phase ◽  
Control Group ◽  
Domain I ◽  
Normal Controls ◽  
Better Than

Background: Patients positive for three types of antiphospholipid antibodies (aPLs) (triple positivity) have been identified at a high risk for thrombotic events. However, the clinical significance of isolated lupus anticoagulant (LAC) positivity is debated. Objectives: To investigate the clinical relevance of isolated LAC. Patients/Methods 456 patients were enrolled in this study; 66 antiphospholipid syndrome patients and 390 control patients. The control group existed of autoimmune patients (n=91), patients with thrombosis but without aPLs (n=127) and normal controls (n=172). The criteria LAC, anti-cardiolipin (anti-CL) and anti-beta2glycoprotein I (anti-β2GPI) IgG and IgM and the non-criteria IgA anti-CL and anti-β2GPI, anti-domain I (anti-DI) of β2GPI IgG and anti-phosphatidylserine/prothrombin (anti-PS/PT) IgG and IgM were detected according to the ISTH guidelines for solid phase assays. Results: 70 patients were positive for LAC, of which 44 were negative for both anti-β2GPI and anti-CL. We found that isolated LAC proved to be strongly associated with vascular thrombosis (Odds ratio (OR) (95% CI) 7.3 (3.3-16.1)), even better than triple positive samples (OR 4.3 (1.6-12.2)). The titers of the anti-PS/PT IgG and IgM were significantly higher in triple positivity samples compared to samples with isolated LAC positivity. The majority of single LAC positives were anti-PS/PT negative. We observed that LAC positivity was weaker in isolated LAC positive patients compared to LAC activity in triple positive patients. Conclusions: Isolated LAC was highly associated with thrombosis. The presence of anti-PS/PT could not explain LAC positivity in isolated LAC. Isolated LAC showed a weaker LAC activity compared to triple positive patients.

scholarly journals Autistic traits in offspring of schizophrenic patients in comparison to those of normal population: a case-control study

2021 ◽  
Vol 28 (1) ◽  
Author(s):  
Shimaa Ibrahim Amin ◽  
Ghada Mohamed Salah EL-Deen
Keyword(s):  
Social Class ◽  
Autistic Traits ◽  
Autism Spectrum ◽  
Cutoff Point ◽  
Control Group ◽  
Case Group ◽  
Parental History ◽  
Autism Quotient ◽  
Wide Range ◽  
Schizophrenic Patients

Abstract Background Autism is not a discreet condition and those families members with autistic propend are more likely to display autistic symptoms with a wide range of severity, even below the threshold for diagnosis of autism spectrum disorders. Even with a parental history of schizophrenia, the likelihood of autistic spectrum disorder was found to be 3-fold greater. The aim of this study is to assess autistic traits among offspring of schizophrenic patients in the age group from 4 to 11 years and compare it in the offspring of normal individuals, and its association with the sociodemographic data. To determine whether schizophrenic parents are a risk factor to autistic traits in their children. Results There was a statistically significant (P < 0.05*) increase in Autism Quotient Child scores of the case group where 47.2% had a score equal or more than the cutoff point (76), while only 17 19.4% of the control group had the same score with odds = 3.71 indicating that children of schizophrenic parents 18 were three times likely to have Autism Quotient-Child score greater than or equal to the cutoff point (76) than 19 children of healthy parents. No statistically significant association (P ≥ 0.05) was found between all 20 sociodemographic characteristics and Autism Quotient-Child scores among the case group except for family 21 income and social class where there was a statistically significant association (P < 0.05) between insufficient income 22 and low social class and higher Autism Quotient-Child score (≥ 76). Conclusions Children of schizophrenic parents are at high risk to have autistic traits than children of normal parents.

Cervicogenic Headache: Lack of Influence of Pregnancy

Cephalalgia ◽  
2002 ◽  
Vol 22 (8) ◽  
pp. 667-671 ◽  
Author(s):  
O Sjaastad ◽  
TA Fredriksen
Keyword(s):  
International Headache Society ◽  
Biological Marker ◽  
International Study ◽  
Cervicogenic Headache ◽  
Lower Number ◽  
Control Group ◽  
Study Group ◽  
Head Pain ◽  
International Study Group ◽  
A Minor

The influence of pregnancy upon the head pain of cervicogenic headache (CEH) has been studied in 14 patients (number of pregnancies 25). Migraine was used as control group ( n = 49; number of pregnancies 116). CEH was diagnosed according to The Cervicogenic Headache International Study Group guidelines. Migraine was diagnosed according to International Headache Society (IHS) guidelines; a further requirement was that at least eight of nine solitary IHS diagnostic requirements of migraine were present. In 79%—or more—of CEH patients, attacks seemed to appear just as usual during pregnancy; in one patient, attacks stopped completely, and in two there may have been a minor reduction of attacks. A significantly lower number of migraine patients (up to 18%) were more or less uninfluenced by pregnancy (CEH vs. migraine P < 0.0001, X2 test). The lack of response to pregnancy may be a sort of biological marker in CEH. It may also help in clinically distinguishing CEH from migraine when CEH starts early in life, i.e. prior to pregnancies.

Express Saccades and Smooth Pursuit Eye Movement Function in Schizophrenic, Affective Disorder, and Normal Subjects

1993 ◽  
Vol 5 (3) ◽  
pp. 303-316 ◽  
Author(s):  
Anne B. Sereno ◽  
Philip S. Holzman
Keyword(s):  
Response Time ◽  
Eye Movement ◽  
Smooth Pursuit ◽  
Normal Subjects ◽  
Control Group ◽  
Saccadic Response ◽  
Group A ◽  
Schizophrenic Group ◽  
Movement Function ◽  
Normal Controls

Saccadic and smooth pursuit eye movements were recorded in three groups of subjects: a schizophrenic group, a non-schizophrenic psychotic patient comparison group, and a normal control group. Schizophrenic subjects demonstrated a greater decrease in saccadic response time than did normal controls in a gap task (when the fixation point was turned off 150 msec before the target appeared). The psychiatric comparison subjects did not differ from normal controls. Further, only schizophrenic subjects demonstrated a relation between smooth pursuit and saccadic eye movement performance, such that subjects with impaired smooth pursuit showed a larger decrease in saccadic response time in the gap task. The relation between performance on the gap task and quality of smooth pursuit and its relevance for a prefrontal deficit hypothesis of schizophrenia are discussed.

Comparative behavioral and biochemical effects of tranylcypromine and cysteine on normal controls and schizophrenic patients

Life Sciences ◽  
1970 ◽  
Vol 9 (18) ◽  
pp. 1021-1032 ◽  
Author(s):  
N. Narasimhachari ◽  
B. Heller ◽  
J. Spaide ◽  
L. Haskovec ◽  
M. Fujimori ◽  
...  
Keyword(s):  
Biochemical Effects ◽  
Schizophrenic Patients ◽  
Normal Controls

Somatosensory Evoked Potentials in Schizophrenia a Lateralisation Study

1990 ◽  
Vol 157 (6) ◽  
pp. 881-887 ◽  
Author(s):  
Paul Furlong ◽  
Paul Barczak ◽  
Gwilym Hayes ◽  
Graham Harding
Keyword(s):  
Index Finger ◽  
Objective Measure ◽  
Control Group ◽  
Temporal Region ◽  
Control Groups ◽  
Significant Difference ◽  
Schizophrenic Patients ◽  
Left And Right ◽  
And Control ◽  
Stimulation Of

The SSEPs obtained from 19 schizophrenics defined by RDC, DSM–III and PSE criteria Were compared with those from a control group of healthy volunteers. Previous findings of an abnormal lack of lateralising response in schizophrenic patients were not replicated. No significant difference in either amplitude or morphology between the traces obtained from the two groups were recorded. Ipsilateral and contralateral latencies for stimulation of the left and right index finger showed no significant difference in peak latency for any component between patient and control group. When mean peak-to-peak amplitudes were plotted the contralateral component was always greater in amplitude than the ipsilateral one. An objective measure of the degree of lateralisation, the percentage lateralisation quotient, showed no lateralisation differences between the patient and control groups. A case of myogenic contamination of ipsilateral components was observed calling into doubt findings where no temporal region monitoring has been performed.

Negative Features, Retrieval Processes and Verbal Fluency in Schizophrenia

1993 ◽  
Vol 163 (6) ◽  
pp. 769-775 ◽  
Author(s):  
Heidi A. Allen ◽  
Peter F. Liddle ◽  
Christopher D. Frith
Keyword(s):  
Verbal Fluency ◽  
Chronic Schizophrenic ◽  
Retrieval Processes ◽  
Schizophrenic Patients ◽  
Normal Controls

Twenty chronic schizophrenic patients, ten matched normal controls and nine depressed controls performed categorical verbal fluency tasks for three minutes each on five separate occasions. On each occasion the schizophrenic patients generated significantly fewer words than the controls. Comparison of the different occasions showed that the schizophrenic patients had as many words available in their inner lexicons but were inefficient in retrieving them. The schizophrenic patients also generated fewer clusters of related words and more words outside the specified category. Reduced ability to generate words while the lexicon remained intact was more marked in patients with negative features. Patients with incoherence, in contrast, were more likely to produce inappropriate words. We propose that both poverty of speech and incoherence of speech reflect problems in the retrieval of words from the lexicon. To cope with these problems patients with poverty of speech terminate their search prematurely while the patients with incoherence commit errors in selecting words for output.

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