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Hyperbaric oxygen diving affects exhaled molecular profiles in men.

P J A M van Ooij1, R A van Hulst2, W Kulik3

  • 1Diving Medical Center, Royal Netherlands Navy, Den Helder, The Netherlands; Department of Respiratory Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.

Respiratory Physiology & Neurobiology
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Summary
This summary is machine-generated.

Hyperbaric oxygen exposure during diving alters exhaled volatile organic compounds (VOCs). Oxygen dives, compared to air dives, significantly increased specific VOCs, suggesting a unique molecular signature linked to hyperoxia.

Keywords:
DivingExhaled breathMethyl alkanesPulmonary oxygen toxicityVolatile organic compounds

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Area of Science:

  • Biochemistry
  • Environmental Medicine
  • Physiology

Background:

  • Exhaled breath contains volatile organic compounds (VOCs) linked to respiratory conditions.
  • Hyperbaric oxygen exposure (hyperoxia) may alter these VOC profiles.
  • Understanding these changes is crucial for assessing physiological responses to hyperbaric environments.

Purpose of the Study:

  • To investigate if hyperbaric oxygen exposure during submerged diving alters exhaled VOC patterns.
  • To identify specific VOCs that change following oxygen-breathing dives.
  • To correlate changes in VOCs with physiological responses in divers.

Main Methods:

  • 10 male divers participated in randomized air and 100% oxygen dives to 9 meters seawater (190kPa) for 1 hour.
  • Exhaled breath VOCs were measured before and 4 hours after dives.
  • Two-dimensional gas chromatography with time-of-flight mass spectrometry (GCxGC-TOFMS) was used for VOC analysis.

Main Results:

  • Oxygen dives led to a significant increase in five specific VOCs, primarily methyl alkanes, compared to air dives.
  • A strong positive correlation was observed between increased levels of 2,4-dimethyl-hexane and 4-ethyl-5-methyl-nonane.
  • This study is the first to show altered exhaled molecular profiles after submerged oxygen diving.

Conclusions:

  • Submerged hyperbaric oxygen exposure induces a distinct pattern of exhaled VOCs in divers.
  • The observed VOC changes may be related to lipid peroxidation or inflammatory pathways.
  • Further research is needed to elucidate the precise pathophysiological mechanisms involved.