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Psychol Med. 2018 May;48(7):1111-1118. doi: 10.1017/S0033291717002495. Epub 2017 Sep 18.

Quality of life in bipolar disorder: towards a dynamic understanding.

Author information

1
Faculty of Health,Arts and Design Swinburne University,Melbourne,Australia.
2
Department of Psychiatry,University of British Columbia,Vancouver, BC,Canada.
3
Bipolar Disorders Program,Department of Psychiatry,Douglas Mental Health University Institute, McGill University,Montreal, QC,Canada.
4
Regional Mental Health Care London,London, ON,Canada.
5
Mood Disorders Program,Department of Psychiatry,McGill University Health Center (MUHC),Montreal,Canada.
6
Department of Psychiatry,Toronto Western Hospital,Toronto, ON,Canada.

Abstract

BACKGROUND:

Although quality of life (QoL) is receiving increasing attention in bipolar disorder (BD) research and practice, little is known about its naturalistic trajectory. The dual aims of this study were to prospectively investigate: (a) the trajectory of QoL under guideline-driven treatment and (b) the dynamic relationship between mood symptoms and QoL.

METHODS:

In total, 362 patients with BD receiving guideline-driven treatment were prospectively followed at 3-month intervals for up to 5 years. Mental (Mental Component Score - MCS) and physical (Physical Component Score - PCS) QoL were measured using the self-report SF-36. Clinician-rated symptom data were recorded for mania and depression. Multilevel modelling was used to analyse MCS and PCS over time, QoL trajectories predicted by time-lagged symptoms, and symptom trajectories predicted by time-lagged QoL.

RESULTS:

MCS exhibited a positive trajectory, while PCS worsened over time. Investigation of temporal relationships between QoL and symptoms suggested bidirectional effects: earlier depressive symptoms were negatively associated with mental QoL, and earlier manic symptoms were negatively associated with physical QoL. Importantly, earlier MCS and PCS were both negatively associated with downstream symptoms of mania and depression.

CONCLUSIONS:

The present investigation illustrates real-world outcomes for QoL under guideline-driven BD treatment: improvements in mental QoL and decrements in physical QoL were observed. The data permitted investigation of dynamic interactions between QoL and symptoms, generating novel evidence for bidirectional effects and encouraging further research into this important interplay. Investigation of relevant time-varying covariates (e.g. medications) was beyond scope. Future research should investigate possible determinants of QoL and the interplay between symptoms and wellbeing/satisfaction-centric measures of QoL.

KEYWORDS:

Bipolar disorder; depression; functioning; mania; quality of life

PMID:
28918761
DOI:
10.1017/S0033291717002495
[Indexed for MEDLINE]

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