Article

At Clinical High Risk for Psychosis: Outcome for Nonconverters

Harvard University, Cambridge, Massachusetts, United States
American Journal of Psychiatry (Impact Factor: 12.3). 04/2011; 168(8):800-5. DOI: 10.1176/appi.ajp.2011.10081191
Source: PubMed

ABSTRACT

A major focus of early intervention research is determining the risk of conversion to psychosis and developing optimal algorithms of prediction. Although reported rates of nonconversion vary in the literature, the nonconversion rate always encompasses a majority (50%-85%) of the sample participants. Less is known about the outcome among this group, referred to as false positive individuals.
A longitudinal study was conducted of more than 300 prospectively identified treatment-seeking individuals meeting criteria for a psychosis-risk syndrome. Participants were recruited and evaluated across eight clinical research centers as part of the North American Prodrome Longitudinal Study. Over a 2.5-year follow-up assessment period, 214 (71%) participants had not made the transition to psychosis.
The sample examined included 111 individuals who had at least 1 year of follow-up data available and did not transition to psychosis within the study duration. In year 1, there was significant improvement in ratings for attenuated positive and negative symptoms. However, at least one attenuated positive symptom was still present for 43% of the sample at 1 year and for 41% at 2 years. At the follow-up timepoints, social and role functioning were significantly poorer in the clinical sample relative to nonpsychiatric comparison subjects.
Help-seeking individuals who meet prodromal criteria appear to represent those who are truly at risk for psychosis and are showing the first signs of illness, those who remit in terms of the symptoms used to index clinical high-risk status, and those who continue to have attenuated positive symptoms.

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    • "The current study aimed to expand upon previous research by examining, in a large cohort of individuals at CHR for psychosis and healthy controls, whether social cognition is impaired. It has been observed that the majority of individuals who present as being at CHR and who do not make the transition to psychosis continue to have deficits in social function (Addington et al., 2011), plus there is a link between social cognition and social functioning . It would therefore be important to have an improved understanding of these early deficits in social cognition in the CHR population as a whole so that potential treatments at this pre-psychotic phase could be developed. "
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    ABSTRACT: Social cognition, the mental operations that underlie social interactions, is a major construct to investigate in schizophrenia. Impairments in social cognition are present before the onset of psychosis, and even in unaffected first-degree relatives, suggesting that social cognition may be a trait marker of the illness. In a large cohort of individuals at clinical high risk for psychosis (CHR) and healthy controls, three domains of social cognition (theory of mind, facial emotion recognition and social perception) were assessed to clarify which domains are impaired in this population. Six-hundred and seventy-five CHR individuals and 264 controls, who were part of the multi-site North American Prodromal Longitudinal Study, completed The Awareness of Social Inference Test, the Penn Emotion Recognition task, the Penn Emotion Differentiation task, and the Relationship Across Domains, measures of theory of mind, facial emotion recognition, and social perception, respectively. Social cognition was not related to positive and negative symptom severity, but was associated with age and IQ. CHR individuals demonstrated poorer performance on all measures of social cognition. However, after controlling for age and IQ, the group differences remained significant for measures of theory of mind and social perception, but not for facial emotion recognition. Theory of mind and social perception are impaired in individuals at CHR for psychosis. Age and IQ seem to play an important role in the arising of deficits in facial affect recognition. Future studies should examine the stability of social cognition deficits over time and their role, if any, in the development of psychosis.
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    • "Approximately onethird of adolescents and young adults with CHR transition to full psychosis (Cornblatt et al., 2003; Fusar-Poli et al., 2012). Many nonconverters continue to experience functional impairment (Addington et al., 2011). Prevention of the disability of CHR and psychosis will require understanding the underlying biological processes and biomarkers sensitive to these processes. "
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    ABSTRACT: Background: The N100 is a negative deflection in the surface EEG approximately 100ms after an auditory signal. It has been shown to be reduced in individuals with schizophrenia and those at clinical high risk (CHR). N100 blunting may index neural network dysfunction underlying psychotic symptoms. This phenomenon has received little attention in pediatric populations. Method: This cross-sectional study compared the N100 response measured via the average EEG response at the left medial frontal position FC1 to 150 sinusoidal tones in participants ages 5 to 17years with a CHR syndrome (n=29), a psychotic disorder (n=22), or healthy controls (n=17). Results: Linear regression analyses that considered potential covariates (age, gender, handedness, family mental health history, medication usage) revealed decreasing N100 amplitude with increasing severity of psychotic symptomatology from healthy to CHR to psychotic level. Conclusions: Longitudinal assessment of the N100 in CHR children who do and do not develop psychosis will inform whether it predicts transition to psychosis and if its response to treatment predicts symptom change.
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    • "Above and beyond attenuated psychotic symptoms, social functioning is a significant predictor of whether an individual may develop psychosis (Cannon et al., 2008; Cornblatt et al., 2012; Fusar-Poli et al., 2012). Further, for those who are ascertained to be at-risk, but do not develop psychosis over the follow-up period, at least half remain socially impaired (Addington et al., 2011; Schlosser et al., 2012). By improving our understanding of social functioning in this population, therapeutic targets may be developed to significantly improve outcome and possibly even prevent the onset of psychosis. "
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