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Human auditory brain stem response during induced hyperthermia.

K Kohshi1, N Konda

  • 1Department of Hyperbaric Medicine, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|October 1, 1990
PubMed
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This study found that auditory brain stem response (ABR) interpeak latencies shorten as core body temperature rises. These changes in ABR latencies correlate with esophageal and rectal temperatures during induced hyperthermia.

Area of Science:

  • Neuroscience
  • Physiology
  • Biomedical Engineering

Background:

  • Auditory Brainstem Response (ABR) is a non-invasive electrophysiological test measuring neural activity along the auditory pathway.
  • Core body temperature significantly influences physiological processes, including neural function.
  • Understanding the relationship between temperature and ABR can provide insights into thermoregulation and neurological responses.

Purpose of the Study:

  • To investigate the relationship between core body temperature and Auditory Brainstem Response (ABR) interpeak latencies (IPLs).
  • To quantify the changes in specific ABR IPLs in response to induced hyperthermia.

Main Methods:

  • Continuous monitoring of ABR, esophageal temperature (Tes), and rectal temperature (Tre) in male undergraduate subjects.

Related Experiment Videos

  • Induced hyperthermia by immersing subjects in a temperature-controlled water bath (30-42°C), altering Tes from 36.8°C to 39.5°C.
  • Analysis of the correlation between IPLs (I-III, I-V, III-V) and core temperatures.

    • Main Results:

    • ABR interpeak latencies (IPLs) significantly shortened as core body temperature increased.
    • IPLs showed a strong correlation with both esophageal (Tes) and rectal temperatures (Tre).
    • The average slopes for IPL(I-III) and IPL(I-V) per degree Celsius change were significantly steeper than for IPL(III-V).

    Conclusions:

    • Changes in ABR IPLs are sensitive indicators of core body temperature fluctuations during hyperthermia.
    • IPL(I-III) and IPL(I-V) exhibit distinct temperature-dependent changes (0.11 ms and 0.16 ms/°C, respectively).
    • This study provides quantitative data on human ABR responses to induced hyperthermia, relevant for clinical and research applications.