Joint Analysis of Cognitive and Circadian Variation in Schizophrenia and Bipolar I Disorder

Overview

Journal Asian J Psychiatr

Publisher Elsevier

Date 2017 Nov 22

PMID 29158147

Citations 3

Authors

Pramod Thomas

Fanyin He

Sati Mazumdar

Joel Wood

Triptish Bhatia

Ruben C Gur

Raquel E Gur

Daniel Buysse

Vishwajit L Nimgaonkar

Smita N Deshpande

Affiliations

Soon will be listed here.

Abstract

Background: Impairment in cognitive variables and alterations in circadian function have been documented among patients with schizophrenia (SZ) and bipolar I disorder (BP1), but it is not known whether joint analysis of these variables can define clinically relevant sub-groups in either disorder.

Objectives: To evaluate the pattern and relationship of cognitive and circadian function in SZ and BP1 patients with respect to diagnosis and indices of clinical severity.

Methods: Among patients with SZ and BP1, cognitive function was evaluated using the Penn Computerized Neurocognitive Battery and circadian function was assessed using the Composite Scale of Morningness/ Eveningness (CSM). Clinical severity was estimated using the Global Assessment of Function (GAF) scale, and age at onset of illness (AAO). The patients were compared with community based non-psychotic control individuals and non-psychotic first degree relatives of the SZ patients. The cluster distributions of cognitive function, circadian function and clinical severity were investigated and identified clusters compared across diagnostic groups.

Results: Across participants, the cognitive domains could be separated into two clusters. Cluster 1 included the majority of control individuals and non-psychotic relatives, while SZ patients predominated in Cluster 2. BP1 patients were distributed across both clusters. The clusters could be differentiated by GAF scores, but not AAO. CSM scores were not significantly correlated with individual cognitive domains or with the clusters.

Conclusions: Clusters based on levels of cognitive function can discriminate SZ patients from control individuals, but not BP1 patients. CSM scores do not contribute to such discrimination.

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