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The association between biological rhythms, depression, and functioning in bipolar disorder: a large multi-center
M Pinho1,2, M Sehmbi3, L E Cudney4
1Laboratory of Molecular Psychiatry, INCT for Translational Medicine - CNPq, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.
Acta Psychiatrica Scandinavica
|May 27, 2015
Summary
Disruptions in biological rhythms are linked to more severe depressive symptoms in bipolar disorder. Improving rhythm stability may help manage bipolar disorder and improve daily functioning.
Area of Science:
- Neuroscience
- Psychiatry
- Chronobiology
Background:
- Bipolar disorder is a mood disorder characterized by significant mood fluctuations.
- Biological rhythms, including sleep-wake cycles and social routines, are often disrupted in individuals with bipolar disorder.
- These disruptions may impact symptom severity and overall functioning.
Purpose of the Study:
- To investigate the association between biological rhythms and depressive symptom severity in bipolar disorder.
- To examine the effect of biological rhythm alterations on functional impairment in bipolar disorder patients.
Main Methods:
- The study included 260 bipolar patients and 191 healthy controls from Spain, Brazil, and Canada.
- Biological rhythms were assessed using the Biological Rhythms Assessment in Neuropsychiatry (BRIAN) questionnaire.
- BRIAN measures disruptions in sleep, eating, social patterns, and general activity.
Main Results:
- Significant differences in biological rhythms were observed between groups, even after controlling for confounders.
- Depressed patients exhibited the most significant biological rhythm disturbances, followed by subsyndromal, euthymic patients, and controls.
- Both biological rhythm disruption and depressive symptom severity (HAMD scores) independently predicted poor functioning.
Conclusions:
- A dose-dependent relationship exists between depressive symptom severity and biological rhythm disturbance in bipolar disorder.
- Disturbance in biological rhythms is an independent predictor of functional impairment.
- Stabilizing biological rhythms should be a key therapeutic target for managing bipolar disorder and improving patient functioning.
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