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Related Experiment Videos

Human tecg changes during prolonged hyperbaric exposures breathing N2-O2 mixtures

J M Wilson, P D Kligfield, G M Adams

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |April 1, 1977
    PubMed
    Summary

    Hyperbaric exposures affect diver heart rates, causing bradycardia during compression and bradycardia or tachycardia during excursions. Decompression uniformly increased heart rate, with some divers showing altered repolarization and conduction delays.

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    Area of Science:

    • Cardiovascular Physiology
    • Diving Medicine
    • Hyperbaric Physiology

    Background:

    • Hyperbaric environments present unique physiological challenges.
    • Understanding the cardiac effects of hyperbaric exposures is crucial for diver safety.

    Purpose of the Study:

    • To investigate the effects of hyperbaric N2-O2 exposures on cardiac depolarization and repolarization in divers.

    Main Methods:

    • Analysis of electrocardiograms from 10 divers during four N2-O2 saturation dives.
    • Monitoring heart rate, P-Q-R-S-T intervals, and wave morphologies under varying hyperbaric conditions.

    Main Results:

    • Observed heart rate decline (20-30%) upon compression, with adaptation at constant depth.
    • Excursion dives caused heart rate changes inversely related to depth.

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  • Hyperbaric bradycardia persisted longer at greater depths (200 fswg).
  • Decompression led to a rapid, significant heart rate increase.
  • Alterations in myocardial repolarization (Q-T interval, ST, T waves) were noted.
  • Right ventricular conduction delay and arrhythmias (e.g., nodal rhythm, PVCs) occurred in some divers at deeper exposures.

    • Conclusions:

    • Hyperbaric environment variables (gas density, pressure, inert gas) significantly impact cardiac pacemaker activity, depolarization, and repolarization.
    • Findings suggest potential cardiac strain and altered electrical activity under hyperbaric conditions.