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Altered cardiac autonomic nervous function in depression

Yiming Wang, Xun Zhao, Adrienne O'Neil

    BMC Psychiatry
    |July 12, 2013
    PubMed

    Insights

    Depression is linked to impaired cardiac autonomic function and increased arrhythmia risk. Greater depression severity correlates with more severe autonomic dysfunction, suggesting a need for cardiac monitoring in depressed individuals.

    Area of Science:

    • Cardiology
    • Psychiatry
    • Autonomic Neuroscience

    Background:

    • Depression is an independent risk factor for coronary artery disease.
    • Autonomic instability may mediate the link between depression and cardiovascular disease.
    • The relationship between cardiac autonomic function, arrhythmia, and depression severity requires further elucidation.

    Purpose of the Study:

    • To investigate cardiac autonomic function in individuals with major depression.
    • To explore the correlation between depression severity and Heart Rate Variability (HRV) indices.
    • To determine the prevalence of cardiac arrhythmia in depression.

    Main Methods:

    • Compared 53 individuals with major depression (HAMD ≥20, SDS >53) to 53 matched healthy controls.
    • Collected 24-hour Holter ECG data to assess HRV time-domain indices: SDNN, SDANN, RMSSD, pNN50.
    • Utilized Pearson's correlations to analyze the association between depression severity (SDS) and HRV indices (SDNN, LF/HF ratio).

    Main Results:

    • Depression group showed significantly lower HRV indices (SDNN, SDANN, RMSSD, pNN50, HF) and higher LF and LF/HF ratio compared to controls (P<.05).
    • A linear relationship was observed between depression severity and HRV indices.
    • The prevalence of arrhythmia, particularly supraventricular arrhythmias, was significantly higher in the depression group (P<.05).

    Conclusions:

    • Depression is associated with significant cardiac autonomic nervous system dysfunction.
    • The severity of cardiac autonomic dysfunction correlates with depression severity.
    • Individuals with depression exhibit increased susceptibility to cardiac arrhythmias, including premature atrial and ventricular conditions.
    Abstract

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