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Hemoptysis and breath-holding diving
Murat Kalemoglu1, Ozcan Keskin
1Department of Emergency Surgery, Gülhane Military Medical Academy, Haydarpasa Training Hospital, Istanbul, Turkey.
Military Medicine
|August 10, 2006
Summary
Breath-hold divers may experience hemoptysis (coughing up blood) due to lung squeeze. Forced breathing attempts during ascent can damage pulmonary capillaries, leading to this condition.
Area of Science:
- Pulmonary medicine
- Diving physiology
- Cardiovascular research
Background:
- Pulmonary barotrauma of descent, or lung squeeze, occurs in breath-hold divers when lung volume decreases below residual volume under increased ambient pressure.
- This phenomenon has been previously described in breath-hold diving contexts.
Observation:
- A case of hemoptysis is presented in a breath-hold diver engaged in military exercise.
- Computed tomography (CT) of the thorax revealed images suggestive of hemoptysis five hours post-diving.
- The diagnosis was confirmed by the diver's history and CT findings.
Findings:
- The patient presented with hemoptysis.
- Divers performed voluntary diaphragmatic contractions with a closed airway during ascent.
- Negative intrathoracic pressure generated by forced breathing attempts and diaphragmatic contractions is implicated.
Implications:
- The negative intrathoracic pressure may cause damage to pulmonary capillaries, leading to hemoptysis.
- This case highlights a potential risk associated with specific breath-hold diving techniques.
- Further research into the mechanisms and prevention of hemoptysis in divers is warranted.
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