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JOURNAL ARTICLE
OBSERVATIONAL STUDY
RESEARCH SUPPORT, NON-U.S. GOV'T
Do antidepressants increase the risk of mania and bipolar disorder in people with depression? A retrospective electronic case register cohort study.
BMJ Open 2015 December 15
OBJECTIVES: To investigate the association between antidepressant therapy and the later onset of mania/bipolar disorder.
DESIGN: Retrospective cohort study using an anonymised electronic health record case register.
SETTING: South London and Maudsley National Health Service (NHS) Trust (SLaM), a large provider of inpatient and community mental healthcare in the UK.
PARTICIPANTS: 21,012 adults presenting to SLaM between 1 April 2006 and 31 March 2013 with unipolar depression.
EXPOSURE: Prior antidepressant therapy recorded in electronic health records.
MAIN OUTCOME MEASURE: Time to subsequent diagnosis of mania or bipolar disorder from date of diagnosis of unipolar depression, censored at 31 March 2014.
METHODS: Multivariable Cox regression analysis with age and gender as covariates.
RESULTS: The overall incidence rate of mania/bipolar disorder was 10.9 per 1000 person-years. The peak incidence of mania/bipolar disorder incidence was seen in patients aged between 26 and 35 years (12.3 per 1000 person-years). Prior antidepressant treatment was associated with an increased incidence of mania/bipolar disorder ranging from 13.1 to 19.1 per 1000 person-years. Multivariable analysis indicated a significant association with selective serotonin reuptake inhibitors (HR 1.34, 95% CI 1.18 to 1.52) and venlafaxine (1.35, 1.07 to 1.70).
CONCLUSIONS: In people with unipolar depression, antidepressant treatment is associated with an increased risk of subsequent mania/bipolar disorder. These findings highlight the importance of considering risk factors for mania when treating people with depression.
DESIGN: Retrospective cohort study using an anonymised electronic health record case register.
SETTING: South London and Maudsley National Health Service (NHS) Trust (SLaM), a large provider of inpatient and community mental healthcare in the UK.
PARTICIPANTS: 21,012 adults presenting to SLaM between 1 April 2006 and 31 March 2013 with unipolar depression.
EXPOSURE: Prior antidepressant therapy recorded in electronic health records.
MAIN OUTCOME MEASURE: Time to subsequent diagnosis of mania or bipolar disorder from date of diagnosis of unipolar depression, censored at 31 March 2014.
METHODS: Multivariable Cox regression analysis with age and gender as covariates.
RESULTS: The overall incidence rate of mania/bipolar disorder was 10.9 per 1000 person-years. The peak incidence of mania/bipolar disorder incidence was seen in patients aged between 26 and 35 years (12.3 per 1000 person-years). Prior antidepressant treatment was associated with an increased incidence of mania/bipolar disorder ranging from 13.1 to 19.1 per 1000 person-years. Multivariable analysis indicated a significant association with selective serotonin reuptake inhibitors (HR 1.34, 95% CI 1.18 to 1.52) and venlafaxine (1.35, 1.07 to 1.70).
CONCLUSIONS: In people with unipolar depression, antidepressant treatment is associated with an increased risk of subsequent mania/bipolar disorder. These findings highlight the importance of considering risk factors for mania when treating people with depression.
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