Hemoptysis provoked by voluntary diaphragmatic contractions in breath-hold divers


Kiyan E. , Aktas S. , Toklu A. S.

CHEST, vol.120, no.6, pp.2098-2100, 2001 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 120 Issue: 6
  • Publication Date: 2001
  • Doi Number: 10.1378/chest.120.6.2098
  • Title of Journal : CHEST
  • Page Numbers: pp.2098-2100

Abstract

Hemoptysis provoked by voluntary diaphragmatic contractions in breath-hold divers

By:Kiyan, E (Kiyan, E); Aktas, S (Aktas, S); Toklu, AS (Toklu, AS)

 

CHEST

 

Volume: 120

Issue: 6

Pages: 2098-2100

DOI: 10.1378/chest.120.6.2098

Published: DEC 2001

View Journal Information

 

 

Abstract

Pulmonary barotrauma of descent (lung squeeze) has been described in breath-hold divers when the lung volume becomes smaller than the residual volume (RV), with the effect of increased ambient pressure. However, the ratio between the total lung capacity and the RV is not the only factor that plays a role in the lung squeeze. Blood shift into the thorax is another important factor. We report three cases of hemoptysis in breath-hold divers who dove for spear fishing in shallower depths than usual. All of the divers performed voluntary diaphragmatic contractions at the beginning of their ascent, while their mouths and noses were closed. We suggest that the negative intrathoracic pressure due to the forced attempt to breathe in with voluntary diaphragmatic contractions contributes to alveolar hemorrhage, since it may damage the pulmonary capillaries.

Keywords

Author Keywords:alveolar hemorrhage; breath-hold diving; hemoptysis

KeyWords Plus:PULMONARY-EDEMA

Author Information

Reprint Address: Aktas, S (reprint author)

Istanbul Univ, Istanbul Tip Fakultesi, Dept Undersea & Hyperbar Med, TR-34390 Istanbul, Turkey.

 

Addresses:

[ 1 ] Istanbul Univ, Istanbul Tip Fakultesi, Dept Undersea & Hyperbar Med, TR-34390 Istanbul, Turkey
[ 2 ] Istanbul Univ, Dept Chest Med, TR-34390 Istanbul, Turkey

 

Pulmonary barotrauma of descent (lung squeeze) has been described in breath-hold divers when the lung volume becomes smaller than the residual volume (RV), with the effect of increased ambient pressure. However, the ratio between the total lung capacity and the RV is not the only factor that plays a role in the lung squeeze. Blood shift into the thorax is another important factor. We report three cases of hemoptysis in breath-hold divers who dove for spear fishing in shallower depths than usual. All of the divers performed voluntary diaphragmatic contractions at the beginning of their ascent, while their mouths and noses were closed. We suggest that the negative intrathoracic pressure due to the forced attempt to breathe in with voluntary diaphragmatic contractions contributes to alveolar hemorrhage, since it may damage the pulmonary capillaries.