A reduced risk of stroke with lithium exposure in bipolar disorder: A population-based retrospective cohort study

Chen Chia Lan, Chia Chien Liu, Ching Heng Lin, Tzuo Yun Lan, Melvin G. McInnis, Chin Hong Chan, Tsuo Hung Lan

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Objectives: The risk of stroke is increased in patients with bipolar disorder. Lithium exhibits neuroprotective effects but the association between lithium use and the risk of stroke is unknown. Methods: A population-based retrospective cohort study was conducted by utilizing the National Health Insurance Research Database in Taiwan. Subjects who had first been diagnosed with bipolar disorder between 2001 and 2006 were identified. A propensity score (PS) for receiving lithium was calculated with variables of age, gender, and comorbidities. The patients with bipolar disorder receiving lithium within the period from diagnosis through to December 2011 were designated as the lithium group (n = 635). A 1:2 ratio was used to select PS-matched subjects with bipolar disorder without lithium use (n = 1,250). Multivariate Cox proportional hazards regression models were used to explore the association, rather than causal inference, of lithium exposure and the risk of stroke. Results: Of the 1,885 subjects, 86 (4.6%) experienced stroke, including 2.8% of the lithium group and 5.4% of the non-lithium group. Lithium use was associated with a significantly reduced risk of stroke [hazard ratio (HR) = 0.39, 95% confidence interval (CI): 0.22-0.68]. Reduced risks of stroke were also associated with the highest cumulative lithium dose [≥720 defined daily dose (DDD), HR = 0.25, 95% CI: 0.10-0.59], the longest cumulative exposure period (≥720 days, HR = 0.20, 95% CI: 0.06-0.64), and the highest exposure rate (≥2 DDD/day, HR = 0.39, 95% CI: 0.21-0.70). Conclusions: Lithium use was significantly related to a reduced risk of stroke in patients with bipolar disorder.

    Original languageEnglish (US)
    Pages (from-to)705-714
    Number of pages10
    JournalBipolar Disorders
    Volume17
    Issue number7
    DOIs
    StatePublished - Nov 2015

    Keywords

    • Bipolar disorder
    • Lithium
    • Neuroprotection
    • Risk
    • Stroke

    ASJC Scopus subject areas

    • Psychiatry and Mental health
    • Biological Psychiatry

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