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Related Concept Videos

Disorders of the Autonomic Nervous System01:18

Disorders of the Autonomic Nervous System

The autonomic nervous system (ANS) is an intricate network of nerves that controls functions such as the regulation of heart rate, digestion, and blood pressure regulation. When this system malfunctions, it can lead to various disorders that affect multiple bodily functions. One common feature of many autonomic disorders is the involvement of smooth blood vessels, which play a crucial role in regulating blood flow throughout the body.
Raynaud's disease, also known as Raynaud's phenomenon, is a...
Depression: Overview01:18

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
Depressive Disorders: Etiology01:27

Depressive Disorders: Etiology

Depressive disorders result from a complex interplay of biological, psychological, and sociocultural factors, each contributing uniquely to the development and persistence of the condition. Understanding these factors provides critical insight into the multifaceted nature of depression.
Biological Factors in Depression
Biological predispositions significantly influence the risk of developing depressive disorders. Genetic studies highlight the role of variations in the serotonin transporter...
Regulation of Heart Rates01:31

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
Psychoneuroimmunology: Cardiovascular Disease01:27

Psychoneuroimmunology: Cardiovascular Disease

Psychoneuroimmunology (PNI) is a multidisciplinary field that examines how psychological factors, particularly stress, interact with the immune system and impact physical health. Research in PNI has shown that chronic or traumatic stress can disrupt both the hypothalamic-pituitary-adrenal axis and the sympathetic nervous system. These disruptions contribute to serious health conditions, including cardiovascular diseases.
A key area of focus in PNI is the relationship between stress and coronary...
Autonomic Nervous System01:22

Autonomic Nervous System

The autonomic nervous system (ANS) is a critical component of the peripheral nervous system, primarily responsible for regulating involuntary bodily functions and maintaining homeostasis. It functions in tandem with the central nervous system (CNS) to seamlessly coordinate various physiological processes without the need for conscious control.
The ANS comprises two main divisions: the sympathetic and parasympathetic divisions. These divisions function antagonistically to maintain a dynamic...

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Related Experiment Video

Updated: May 9, 2026

An Unpredictable Chronic Mild Stress Protocol for Instigating Depressive Symptoms, Behavioral Changes and Negative Health Outcomes in Rodents
06:55

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Published on: December 2, 2015

Altered cardiac autonomic nervous function in depression.

Yiming Wang, Xun Zhao, Adrienne O'Neil

    BMC Psychiatry
    |July 12, 2013
    PubMed
    Summary
    This summary is machine-generated.

    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.

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    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.