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Related Experiment Video

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Author Spotlight: Exploring the Effects of Transauricular Vagus Nerve Stimulation
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Ultrasound-induced heart rate decrease: role of the vagus nerve.

Olivia Coiado, Elaine Buiochi, William O'Brien

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |February 3, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Ultrasound (US) exposure can decrease rat heart rate, but this study found the vagus nerve (VN) is not responsible for this effect. The US-induced negative chronotropic effect occurs independently of VN function.

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    Area of Science:

    • Cardiovascular Physiology
    • Ultrasound Bioeffects
    • Autonomic Nervous System

    Background:

    • The vagus nerve (VN) plays a key role in regulating heart rate.
    • Previous studies indicated ultrasound (US) can induce a negative chronotropic effect, but the underlying mechanism remains unclear.

    Purpose of the Study:

    • To investigate the involvement of the vagus nerve (VN) in the negative chronotropic effect induced by ultrasound (US).
    • To determine if US-induced heart rate reduction is mediated by the VN.

    Main Methods:

    • Sprague Dawley rats (n=20) underwent transthoracic US exposure at varying peak rarefactional pressure amplitudes (PRPAs) and pulse repetition frequencies (PRFs).
    • Experiments utilized a 2x2 factorial design, comparing intact versus cut VN and US on versus US off conditions.
    • Hemodynamic parameters including heart rate, cardiac output, and arterial pressure were analyzed using two-way repeated measures ANOVA.

    Main Results:

    • Ultrasound exposure resulted in a significant decrease in heart rate (~4%) and cardiac output.
    • No significant difference in US-induced cardiac effects was observed between vagotomized and non-vagotomized rats.
    • The vagus nerve was not found to be significantly influenced by the ultrasound exposure procedures.

    Conclusions:

    • Ultrasound application induces a negative chronotropic effect on the rat heart, independent of the vagus nerve.
    • The findings suggest an alternative cardiac pacing mechanism may be involved in the US-induced heart rate reduction.
    • The vagus nerve does not appear to mediate the observed ultrasound-induced cardiac effects.