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Schizophrenia Research and Treatment
Volume 2018 (2018), Article ID 3968015, 8 pages
Research Article

Effect of Olanzapine on Clinical and Polysomnography Profiles in Patients with Schizophrenia

1Institute of Mental Health, University of Nottingham, Nottingham, UK
2Nottinghamshire Healthcare NHS Foundation Trust, Nottinghamshire, UK
3Mahatma Gandhi Medical College and Research Institute, Pondicherry, India
4K S Mani Centre for Cognitive Neurosciences, Central Institute of Psychiatry, Ranchi, India

Correspondence should be addressed to Mohammad Zia Ul Haq Katshu; moc.liamg@qahluaizrd

Received 7 August 2017; Accepted 17 January 2018; Published 20 February 2018

Academic Editor: Nakao Iwata

Copyright © 2018 Mohammad Zia Ul Haq Katshu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Acute and short-term administration of olanzapine has a favorable effect on sleep in schizophrenia patients. This study aimed to clarify the effect of olanzapine on polysomnographic profiles of schizophrenia patients during the acute phase of illness after controlling for previous drug exposure. Twenty-five drug-naïve or drug-free schizophrenia patients were assessed at baseline and after six weeks of olanzapine treatment on Brief Psychiatric Rating Scale (BPRS), Positive and Negative Syndrome Scale (PANSS), and Udvalg for Kliniske Undersogelser (UKU) side-effect rating scale and a whole-night polysomnography; fifteen patients completed the study. There was a significant reduction in all psychopathological variables with maximum reduction in PANSS total, BPRS total, and PANSS positive scores. A significant increase in total sleep time (TST), sleep efficiency (SE), nonrapid eye movement (NREM) stage 1 duration, stage 3 duration, stage 4 duration, and stage 4 percentage of TST, number of rapid eye movement (REM) periods, REM duration, and REM percentage of TST was observed. REM latency at baseline inversely predicted the reduction in BPRS total and PANSS total and positive scores. In summary, short-term treatment with olanzapine produced significant improvement in clinical and polysomnography profiles of patients with schizophrenia with shorter REM latency predicting a good clinical response.