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07:19
Air-Inflation of Murine Lungs with Vascular Perfusion-Fixation
Published on: February 2, 2021
Lung hyperinflation: foe or friend?
M Eichinger1, S Walterspacher, T Scholz
1Dept of Radiology, German Cancer Research CentreHeidelberg, Germany. m.eichinger@dkfz.de
The European Respiratory Journal
|October 2, 2008
Summary
Glossopharyngeal insufflation (GI) allows breath-hold divers to hyperinflate lungs, increasing breath-hold time. Dynamic MRI confirms this maneuver is physiological and reversible, with no lasting harm.
Area of Science:
- Physiology
- Diving Medicine
Background:
- Breath-hold divers use glossopharyngeal insufflation (GI) to increase lung capacity and oxygen stores.
- This technique aims to prevent lung compression and prolong breath-hold duration at depth.
Observation:
- A case study investigated physiological data and dynamic MRI (dMRI) in a diver using GI.
- The study focused on acute hyperinflation induced by GI and its associated hazards.
Findings:
- Lung volumes and expiratory flows were normal or enhanced, with vital capacity and peak expiratory flow exceeding predicted values.
- Static lung compliance increased five-fold during hyperinflation, while airway resistance and diffusing capacity remained normal.
- dMRI showed preserved thoracic and diaphragmatic shape, with transient lung herniation and costodiaphragmatic angle enlargement, all fully reversible post-expiration.
Implications:
- GI-induced hyperinflation may be a physiological adaptation for deep breath-hold diving.
- Dynamic MRI is effective for visualizing GI maneuvers and confirming the reversibility of hyperinflation.
- Understanding these adaptations is crucial for assessing the safety of competitive breath-hold diving.
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