Document Detail

CNS toxicity in closed-circuit oxygen diving: symptoms reported from 2527 dives.
MedLine Citation:
PMID:  16708533     Owner:  NLM     Status:  MEDLINE    
INTRODUCTION: Oxygen toxicity is a problem in diving and can have fatal consequences in the water. Various aspects of oxygen diving have been studied in dry hyperbaric chambers, but there is a lack of information on in-water diving using closed-circuit oxygen apparatus. METHOD: We collected 2527 dive reports from 473 closed-circuit oxygen divers (a mean of 5.2 reports per diver), and analyzed the relationships between various symptoms and their dependence on depth and diving time. RESULTS: No CNS oxygen toxicity-related symptoms were reported at a depth of 2 m seawater (msw), but their proportion increased at depths from 3 to 6 msw. We found that CNS oxygen toxicity-related symptoms appeared in 2.5% of dives conducted at a Po2 of 119 kPa. The main symptoms and signs reported were headache: 4.5%; nausea: 2.6%; hyperventilation: 2.6%; heavy breathing: 2.4%; dizziness: 1.6%; hiccups: 1.5%; bloody sputum: 1.4%; cold shivering: 1.1%; tinnitus: 0.9%; difficulty maintaining a steady depth: 0.9%; disorientation: 0.6%; tiredness: 0.5%; tingling in the limbs: 0.4%; hearing disturbances: 0.4%; a choking sensation: 0.4%; extreme effort: 0.4%; and loss of consciousness: 0.3%. DISCUSSION: Environmental factors, light vs. dark and temperature, had no effect on symptoms. The number of symptoms increased with diving time. Divers who experienced amnesia, facial twitching, hearing disturbances (p < 0.001), and disorientation (p < 0.014) were prone to suffer loss of consciousness. It was found that some divers are more sensitive to oxygen than others (p < 0.0001).
Ran Arieli; Tzippora Shochat; Yochai Adir
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Aviation, space, and environmental medicine     Volume:  77     ISSN:  0095-6562     ISO Abbreviation:  Aviat Space Environ Med     Publication Date:  2006 May 
Date Detail:
Created Date:  2006-05-19     Completed Date:  2006-10-20     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7501714     Medline TA:  Aviat Space Environ Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  526-32     Citation Subset:  IM; S    
Israel Naval Medical Institute, IDF Medical Corps, Haifa, Israel.
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MeSH Terms
Airway Obstruction / etiology
Confusion / etiology
Dizziness / etiology
Fatigue / etiology
Headache / etiology
Hearing Disorders / etiology
Hemoptysis / etiology
Hiccup / etiology
Hyperventilation / etiology
Military Personnel
Nausea / etiology
Oxygen / adverse effects*
Paresthesia / etiology
Time Factors
Tinnitus / etiology
Unconsciousness / etiology
Work of Breathing
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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