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Chronotype and biological rhythms in bipolar disorders

Published online by Cambridge University Press:  13 August 2021

A. Ben Cheikh Ahmed ,
U. Ouali ,
I. Bouslama ,
Y. Zgueb  and
F. Nacef
A. Ben Cheikh Ahmed
Affiliation:
Department Psychiatry A, Razi Hospital, Manouba, Tunisia
U. Ouali*
Affiliation:
Department Psychiatry A, Razi Hospital, Manouba, Tunisia
I. Bouslama
Affiliation:
Department Psychiatry A, Razi University Hospital, La Manouba, Tunisia
Y. Zgueb
Affiliation:
Department Psychiatry A, Razi Hospital, Manouba, Tunisia
F. Nacef
Affiliation:
Department Psychiatry A, Razi Hospital, Manouba, Tunisia
*
*Corresponding author.

Abstract

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Introduction

Biological rhythms play an important role in the etiology of mood disorders. Several lines of evidence established a link between circadian rhythm disruption and mood episodes. Chronotypes are the behavioral manifestations of circadian rhythms and eveningness appears to be more frequent in bipolar disorder (BD). The influence of chronotype on mood symptoms needs yet to be clarified.

Objectives

-Identifying the predominant chronotype in a Tunisian sample of patients with BD -Assessing the association between chronotype and biological rhythm disruptions in the sample

Methods

For this study, a total of 80 euthymic outpatients with bipolar disorder and 80 control subjects were recruited. Biological rhythms disruptions were assessed using the Biological Rhythm Interview of Assessment in Neuropsychiatry (BRIAN). Predominant chronotype was identified using the composite scale of morningness (CSM).

Results

BRIAN scores showed greater biological rhythms disruptions in bipolar patients than the control subjects (mean scores 35.26±9.21 vs 25.84±2.68). Low CSM scores in the patients’ group indicated a predominant evening chronotype whereas an intermediate chronotype was more frequent within the control group. The correlation analysis revealed a statistically significant negative correlation between the 2 scales (r=-0.716, p<0.001): the CSM scores decreased as the BRIAN scores increased.

Conclusions

This study indicates that eveningness is more common in BD. This chronotype is more likely to disturb biological rhythms which may increase the risk of mood symptoms and lead to a poor prognosis for BD, thus the relevance of treating rhythm alterations, especially in evening-type patients, in order to improve their quality of life and prevent mood episodes.

Disclosure

No significant relationships.

Keywords

Bipolar Disordersbiological rhythmschronotypeBRIAN scale
Type
Abstract
Information
European Psychiatry , Volume 64 , Special Issue S1: Abstracts of the 29th European Congress of Psychiatry , April 2021 , pp. S622
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the European Psychiatric Association
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