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Related Experiment Videos

[Decrease in the lower limit of the rat brain vital activity by the physiological method].

K P Ivanov1, N A Slepchuk

  • 1I. P. Pavlov Institute of Physiology of Russian Acad. Sci., St. Petersburg, Russia.

Rossiiskii Fiziologicheskii Zhurnal Imeni I.M. Sechenova
|October 8, 1999
PubMed
Summary

Brain cooling stops rat respiration around 18°C. Isolated head cooling to 17°C maintained respiration, suggesting blood supply impacts brain temperature limits.

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Area of Science:

  • Physiology
  • Neuroscience
  • Thermoregulation

Context:

  • The lower limit of brain functional competence is defined by the temperature at which spontaneous respiration ceases during cooling.
  • Understanding critical temperature thresholds for brain function is vital for research in hypothermia and resuscitation.

Purpose:

  • To determine the lower temperature limit of brain functional competence in rats.
  • To investigate the effect of isolated head cooling on respiratory function and brain temperature.

Summary:

  • During whole-body cooling, rat respiration ceased when medulla oblongata temperature reached 18.18°C, coinciding with a sharp drop in heart rate and arterial blood pressure.
  • In contrast, isolated head cooling allowed respiration to continue even as medulla oblongata temperature dropped to 17.23°C, maintaining heart rate and blood pressure.

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  • This suggests that sustained blood supply to the brain may lower the critical temperature threshold for vital brain activity.

    • Impact:

    • Provides critical data on brain temperature tolerance during hypothermia.
    • Informs strategies for therapeutic hypothermia and resuscitation in clinical and research settings.
    • Highlights the role of cerebral blood flow in maintaining brain function at low temperatures.