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Related Experiment Videos

Nitrogen partial pressures in man after decompression from simulated scuba dives.

P Radermacher1, B Santak, C M Muth

  • 1Institut für Anaesthesiologie, Heinrich-Heine-Universität, Düsseldorf, FRG.

Scandinavian Journal of Clinical and Laboratory Investigation. Supplementum
|January 1, 1990
PubMed
Summary

This study shows that nitrogen elimination from the body is prolonged even after completing decompression stops for scuba diving. Residual nitrogen in venous blood indicates incomplete washout for up to 160 minutes post-dive.

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Area of Science:

  • Physiology
  • Diving Medicine
  • Biomedical Engineering

Background:

  • Scuba diving involves exposure to increased ambient pressure, leading to nitrogen absorption.
  • Decompression procedures aim to safely remove absorbed nitrogen to prevent decompression sickness.
  • Understanding nitrogen elimination kinetics is crucial for optimizing diving safety.

Purpose of the Study:

  • To investigate the duration of nitrogen elimination after a simulated deep air dive.
  • To assess arterial and central venous nitrogen partial pressures post-decompression.
  • To explore factors contributing to prolonged nitrogen washout.

Main Methods:

  • Five subjects underwent simulated dives to 50m (6 bar) for 30 minutes at rest.
  • A 73-minute decompression schedule with multiple stops was employed.

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  • Arterial and venous blood nitrogen partial pressures (PN2) were measured manometrically up to 240 minutes post-decompression.

    • Main Results:

    • Venous PN2 remained elevated for up to 160 minutes post-decompression.
    • This indicates incomplete nitrogen washout, even after the prescribed decompression.
    • Prolonged nitrogen elimination was observed in subjects at rest.

    Conclusions:

    • Standard decompression schedules may not ensure complete nitrogen elimination within typical timeframes.
    • Bubble formation is a potential cause for delayed nitrogen washout.
    • Resting conditions during simulated dives can lead to prolonged nitrogen elimination post-decompression.