Search

Abstract: The proposed Risk Syndrome for Psychosis (RS) criteria are derived from the Ultra High Risk criteria (UHR) and prodromal or Clinical High Risk criteria (CHR), and consist of subthreshold or attenuated positive psychotic symptoms with operationalized recency and frequency criteria. The rationale behind the proposed inclusion of the RS in the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSMV) is that several studies have found that the UHR/prodromal/CHR criteria predict onset of psychotic disorder, mainly schizophrenia, within a brief time period of a few years. Identifying individuals meeting these criteria thus affords the possibility of early intervention to prevent or delay onset of full blown psychotic disorder. However, the RS is yet to be properly validated. Additionally, there are potential dangerous unintended consequences of the reification of this syndrome as a formal diagnosis. Thus we feel it is premature to justify inclusion of the RS in the DSM. [Copyright &y& Elsevier]

Abstract: Background: Identification of individuals “prodromal” for schizophrenia and other psychotic disorders relies on criteria that predict onset within a brief period. Previous trials and biological research have been predicated on the view that certain “ultra high risk” (UHR) criteria detect “the prodrome”, but there is a need to test the validity of these criteria. Aim: To assess the predictive validity of the UHR criteria in a clinical population. Method: The presence of UHR criteria was determined in 292 help-seeking individuals. At 2 year follow-up the number of new cases of psychotic disorder was assessed. Results: The criteria significantly predicted onset of psychotic disorder within 2 years. The transition rate of 16% was much lower than in initial cohorts (over 40%). Conclusions: The predictive validity of UHR criteria depends on the sample to which they are applied. Although young help-seekers meeting these criteria are at greater risk of psychotic disorder than those who do not meet them, caution is needed in their management, since a high transition rate can no longer be assumed. [Copyright &y& Elsevier]

Abstract: Three types of orbitofrontal cortex (OFC) sulcogyral patterns have been identified in the general population. The distribution of these three types has been found to be altered in individuals at genetic risk of psychosis, and in patients with first episode psychosis (FEP) and chronic schizophrenia. This study aims at establishing whether altered OFC sulcogyral patterns were present in a large cohort of individuals at ultra high risk (UHR) for psychosis. OFC pattern type was classified and the number of posterior and intermediate sulci present on the surface of the OFC was counted. OFC sulcogyral type and the number of sulci were compared between controls (n=58) and UHR participants who transitioned (n=49) versus those who did not transition (n=77) to psychosis. Finally, the relationship between sulcogyral type and number of sulci with intellectual quotient (IQ), symptom severity and social functioning of UHR individuals was explored. In line with other studies conducted in chronic schizophrenia and FEP, UHR individuals who later transitioned to psychosis showed a reduced incidence of the Type I OFC on the right hemisphere compared to controls (χ2 =19.847, p<0.001). These highly consistent results point towards the protective effect of possessing a Type I OFC in the right hemisphere. Furthermore, OFC sulcus counts revealed that controls presented with a higher number of posterior (right hemisphere; χ2 =11.658, p=0.003) and intermediate sulci (left: χ2 =6.643, p=0.036; right: χ2 =11.726, p=0.020) when compared to UHR individuals. However, no associations between OFC types or sulcus count and IQ, symptoms and functioning were observed. [Copyright &y& Elsevier]