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"Double depression": two-year follow-up.

M B Keller, P W Lavori, J Endicott

    The American Journal of Psychiatry
    |June 1, 1983
    PubMed
    Summary
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    Major depressive disorder: a prospective study of residual subthreshold depressive symptoms as predictor of rapid relapse.

    Journal of affective disorders·1998

    Patients with major depressive disorder and chronic minor depression experienced poorer outcomes. Preexisting chronic depression complicated major depression recovery and predicted a worse course for the chronic condition itself.

    Area of Science:

    • Psychiatry and Mental Health
    • Clinical Psychology

    Background:

    • Major Depressive Disorder (MDD) is a significant mental health concern.
    • Chronic Minor Depression (CMD) is a less severe but persistent form of depression.
    • The interplay between MDD and CMD requires further investigation.

    Purpose of the Study:

    • To investigate the impact of preexisting chronic minor depression on the course of major depressive disorder.
    • To identify how chronic minor depression influences recovery predictors and relapse rates in MDD patients.
    • To examine the long-term prognosis of chronic minor depression in individuals with a history of major depression.

    Main Methods:

    • Longitudinal study design.
    • Follow-up period of 6 months to 2 years.

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  • Inclusion of 316 patients diagnosed with major depressive disorder.

    • Main Results:

    • 80 out of 316 patients (25%) had a preexisting chronic minor depression of at least 2 years' duration.
    • Chronic minor depression appeared to diminish the impact of known predictors for MDD recovery and relapse.
    • A pernicious course was predicted for the chronic depression.
    • Continued suffering from chronic minor depression post-MDD recovery increased the likelihood of subsequent MDD relapse, hindering CMD recovery.

    Conclusions:

    • Preexisting chronic minor depression significantly complicates the clinical course and recovery of major depressive disorder.
    • Chronic minor depression is associated with a poorer long-term prognosis and increased risk of recurrent major depressive episodes.
    • Clinical assessment should include screening for chronic minor depression in patients with major depressive disorder to inform treatment strategies and prognosis.