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Inhibitory effects on fast sympathetic rhythms.

P M Gootman, M I Cohen

    Brain Research
    |June 27, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Barbiturate anesthesia and lung inflation inhibit fast neural rhythms in cats. These findings suggest that high-frequency neural oscillations depend on the overall level of excitatory activity.

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    Area of Science:

    • Neuroscience
    • Autonomic Nervous System Research
    • Respiratory Physiology

    Background:

    • Fast neural rhythms are observed in various physiological processes.
    • The influence of anesthesia and afferent signals on these rhythms is not fully understood.

    Purpose of the Study:

    • To investigate the impact of barbiturate anesthesia and pulmonary afferent activity on fast neural rhythms in sympathetic efferent discharges.
    • To determine the relationship between tonic excitatory activity and the presence of high-frequency neural oscillations.

    Main Methods:

    • Experiments were conducted on decerebrate cats.
    • Sympathetic efferent discharges (cervical sympathetic and splanchnic) were analyzed.
    • Lung inflation was used to stimulate pulmonary afferent activity.

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  • Phrenic nerve discharge was also monitored.

    • Main Results:

    • Inhibitory influences from anesthesia and lung inflation reduced overall sympathetic activity.
    • These influences eliminated or significantly decreased fast (approx. 10 Hz) oscillations in sympathetic discharges.
    • Barbiturate anesthesia markedly reduced high-frequency (approx. 100 Hz) oscillations in phrenic discharge.

    Conclusions:

    • The occurrence of fast neural rhythms is dependent on the level of tonic excitatory activity.
    • Anesthesia and pulmonary afferent signals can suppress high-frequency neural oscillations.