Psychiatry research
-
Psychiatry research · Oct 2010
Catechol-O-Methyltransferase (COMT) Val158Met variations and cannabis use in first-episode non-affective psychosis: clinical-onset implications.
New models of interaction between genetic and environmental factors have been proposed to explain the pathogenesis of schizophrenia. The Val158Met polymorphism of the COMT (Catechol-O-Methyltransferase) gene, involved in dopamine regulation and related to negative symptoms, has been previously thought to interact with cannabis use in the modulation of risk of psychosis. The aim of the study was to explore the existence of an interaction between COMT genotype and cannabis use in early stages of psychosis and its effects on the age of onset in a representative group of first-episode psychosis patients. ⋯ The cannabis-COMT interaction showed a significant effect on both DUP and age of onset. Post hoc analyses showed that differences between genotypes were only present in the non-users' group. Based on these results, the use of cannabis could exert a modulator effect on the genotype, suppressing the delay effect for the age of onset in the case of the Met allele patients.
-
Phantom breast syndrome (PBS) represents the experience of the continued presence of the breast, after mastectomy. Our aim was to assess PBS appearance by means of a structured questionnaire and to look into possible associations to disease and treatment parameters, in 105 women with breast cancer treated by mastectomy. PBS was recorded in 22.9% of the patients. ⋯ No significant associations of PBS with previous sensory experiences of the breast, radiotherapy or systemic treatment were assessed. The results are interpreted within the frame of Melzack's theory of a neuromatrix, assuming that PBS represents the continued existence, even after amputation, of a sensory engram of the breast. The absence of infiltration in primary tumour histology, probably through an unknown pathophysiological mechanism, might play a role for the significantly higher incidence of PBS in women undergoing mastectomy for DCIS.
-
Psychiatry research · Oct 2010
The factor structure of the Hospital Anxiety and Depression Scale in individuals with traumatic brain injury.
There is a lack of validated scales for screening for anxiety and depression in individuals with traumatic brain injury (TBI). The purpose of this study was to examine the factor structure of the Hospital Anxiety and Depression Scale (HADS) in individuals with TBI. A total of 294 individuals with TBI (72.1% male; mean age 37.1 years, S. ⋯ The results are in support of the validity of the original anxiety and depression subscales of the HADS and demonstrate the importance of evaluating item wording effects when examining the factor structure of a questionnaire. The results would also justify the use of the HADS as a single scale of emotional distress. However, even though the three-factor solution fit the data, alternative scales should be used if the purpose of the assessment is to measure stress symptoms separately from anxiety and depression.