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[Prospective lung function determination using an electronic miniature spirometer for detection of acute obstructive
1Waffentauchergruppe Eckernförde, Kronshagen.
Pneumologie (Stuttgart, Germany)
|July 20, 1999
Summary
Diving trainees using closed-circuit apparatuses experienced significant lung function decline, unlike those using compressed air. This impairment may stem from high oxygen partial pressures and potential lung edema in closed-circuit divers.
Area of Science:
- Pulmonary physiology
- Diving medicine
Background:
- Experienced divers may exhibit lung function changes.
- Diving trainees offer a unique cohort for studying hyperbaric environment effects.
Purpose of the Study:
- To assess pulmonary function in novice divers before hyperbaric exposure.
- To compare lung function changes between compressed air and closed-circuit diving apparatuses.
Main Methods:
- Fifteen healthy, non-smoking diving trainees underwent spirometry (FVC, FEV1, PEF, MEF 25, 50, 75).
- Measurements were taken pre-dive, post-dive, and at 1 and 4 hours post-dive.
- Subjects were divided into groups using compressed air (n=5) or closed-circuit apparatuses (n=10) with varying gas compositions.
Main Results:
- Compressed air divers showed no significant lung function impairment.
- Closed-circuit divers exhibited significant reductions in FVC, FEV1, PEF, and MEF post-dive.
- These lung function decrements were observed after both deep and shallow dives in the closed-circuit group.
Conclusions:
- Closed-circuit diving apparatuses are associated with significant, reversible lung function impairment in trainees.
- Potential causes include high oxygen partial pressures, subclinical lung edema from pressure differentials, and soda-lime dust exposure.
- Further research is warranted to elucidate the specific mechanisms and long-term effects.