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Related Experiment Videos

Lung diffusing capacity in a hyperbaric environment: assessment by a rebreathing technique.

Z Dujić1, D Eterović, P Denoble

  • 1Department of Physiology, Zagreb University School of Medicine in Split, Ribara, Republic of Croatia.

British Journal of Industrial Medicine
|April 1, 1992
PubMed
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A new rebreathing method accurately measures diffusing lung capacity for carbon monoxide (DLCO) in divers. DLCO increased during dives due to physiological changes, with a slight decrease post-dive potentially linked to venous bubbles.

Area of Science:

  • Physiology
  • Hyperbaric Medicine
  • Respiratory Function

Background:

  • Measuring diffusing lung capacity for carbon monoxide (DLCO) in hyperbaric environments presents unique challenges.
  • Traditional methods may not be suitable for assessing lung function in divers under pressure.

Purpose of the Study:

  • To develop and validate a rebreathing method for DLCO measurement in a hyperbaric setting.
  • To investigate the changes in DLCO and related parameters during and after compressed air diving.

Main Methods:

  • A rebreathing technique was developed and validated against single-breath measurements in 22 naval divers.
  • DLCO, alveolar volume (VA), and DLCO/VA were measured pre-dive, during a 45m dive, and post-dive in 17 divers.
  • Precordial Doppler monitoring was used to detect venous bubbles post-dive.

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Main Results:

  • The rebreathing method showed significant correlations with single-breath measurements for DLCO, VA, and DLCO/VA.
  • DLCO and DLCO/VA exhibited a biphasic change: an increase during the dive followed by a decrease post-dive.
  • A small grade of venous bubbles was detected post-dive, with a limited correlation to the post-dive DLCO decrease.

Conclusions:

  • Rebreathing DLCO measurement is a valid and useful tool for assessing respiratory function in hyperbaric conditions.
  • Increased DLCO during dives is likely due to increased pulmonary capillary blood volume and other physiological adaptations.
  • The post-dive DLCO decrease is only partially explained by detectable venous bubbles.