Correlation of Lifetime Symptom Dimensions with Cognitive Function and Other Clinical Characteristics in Schizophrenia Patients / 대한정신분열병학회지

OBJECTIVES: Considering large diversity of clinical presentation of schizophrenia, it is important to identify valid clinical subtypes or dimensions that might have homogeneous biological underpinning. The current study aimed to explore lifetime symptom-based dimensional phenotypes in patients with chronic schizophrenia, and to investigate their correlation with cognitive functions and other clinical characteristics. METHODS: Lifetime-based symptoms and additional clinical variables were measured using the Diagnostic Interview for Genetic Studies and the Schedule for the Deficit Syndrome in 315 clinically stable patients with chronic schizophrenia. Through principal components factor analysis, eight dimensional phenotypes were obtained. Comprehensive neuropsychological tests were administered for 103 out of 315 patients, and domain scores were calculated for cognitive domains defined in the MATRICS consensus battery. RESULTS: 'Non-paranoid delusion factor' including delusions of grandiose or religious nature, showed significant negative correlation with processing speed, working memory, attention/vigilance, and general cognitive ability, and positive correlation with intra-individual variability. 'Negative symptom factor' showed significant negative correlation only with general cognitive ability. Those two factors were also negatively correlated with function levels measured by Global Assessment Scale (GAS), and associated with poor treatment responses. CONCLUSION: Symptom-based dimensional phenotypes of schizophrenia measured on a lifetime basis showed discriminative correlation with cognitive function domains, global functioning level, and overall treatment responses, indicating their possibility as valid phenotype axes of schizophrenia having homogeneous biologic basis.

Symptom Dimensions of Obsessive-Compulsive Disorder and Their Relation to Comorbid Personality Pathology / 신경정신의학

OBJECTIVES: A great deal of attention has been paid to comorbid personality disorders in obsessive-compulsive disorder not only from the theoretical perspectives but also from the clinical aspects related to the prediction of the treatment response. The purpose of the current study was to investigate the relations of the symptoms dimensions in OCD to the comorbid personality pathology. METHODS: One-hundred thirty subjects with OCD completed Yale-Brown Obsessive Compulsive Scale (YBOCS) and Personality Disorder Questionnaire-4+ (PDQ-4+). Factor scores of symptom dimensions yielded from a factor analysis of 13 categories in YBOCS symptom checklist were inspected how to be related with the presence of any personality disorder and the PDQ scores for cluster A, B, and C personality pathology. RESULTS: The PDQ total score was significantly correlated with aggressive/sexual/religious obsessions, hoarding, and symmetry/ordering dimensions. The hoarding and repeating/counting dimensions were correlated with cluter A pathology, the symmetry/ordering dimension was with cluster B pathology, while the obsessions dimension was globally related to personality disorders of all the clusters. CONCLUSION: These findings add the evidence of the heterogeneity of OCD. The presence of pure obsessions, hoarding, and symmetry/ordering dimensions may need a close screening for comorbid personality disorders and individualized therapeutic strategies.