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PubMed1979

Diving medicine.

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Asthma↗
PubMed2001

Diving accidents in sports divers in Orkney waters.

Scapa Flow in Orkney is one of the major world centres for wreck diving. Because of the geography of Orkney and the nature of the diving, it is possible to make relatively accurate estimates of the number of dives taking place. The denominator of dive activity allows the unusual opportunity of precise calculation of accident rates. In 1999, one in every 178 sports divers visiting Orkney was involved in a significant accident, in 2000 the figure was one in 102. Some of these accidents appear to have been predictable and could be avoided by better education and preparation of visiting divers.

Athletic Injuries↗
PubMed1983

Medical examination of the sport scuba diver.

Prior to training, all scuba diving candidates must successfully complete a medical examination to determine their medical, physical, and psychological fitness for survival in a subaquatic environment. This article reviews the peculiarities of the diving medical examination and the reasons for them, suggests absolute, relative, and temporary disqualifications from diving, and outlines a sport diving questionnaire and medical examination.

Decompression Sickness↗
PubMed2006

Gas embolism and surfactant-based intervention: implications for long-duration space-based activity.

Intravascular gas embolism can occur with decompression in space flight, and it commonly occurs during cardiac and vascular surgery. Intravascular bubbles may be deposited into any end organ such as the heart or the brain. Surface interactions between the bubble and the endothelial cells lining the vasculature result in serious impairment of blood flow and can lead to heart attack, stroke, or even death. Surfactant-based intervention is a novel treatment for gas embolism. Intravascular surfactant can adsorb onto the gas-liquid interface and compete with blood-borne macromolecules for interfacial occupancy. Surfactants can retard the progress of pathophysiological molecular and cellular events stimulated by the bubble surface, including endothelial cell injury and initiation of blood clotting. Bulk and surface transport of a surfactant to provide competition for interfacial occupancy is a therapeutic strategy because surfactant adsorption can dominate protein (or other macromolecule) adsorption. The presence of surfactant along the gas-liquid interface also induces variation in the interfacial tension, which in turn affects the blood flow and the bubble motion. We describe the interplay between biological transport processes and physiological events occurring and the cellular and molecular level in vascular gas embolization. Special consideration is given to modeling the transport and hydrodynamic interactions associated with surfactant-based intervention.

Adsorption↗
PubMed1977

Neurologic and psychologic manifestations of decompression illness in divers.

It has been widely accepted that the neurologic sequelae of decompression illness are confined to the spinal cord. Of 10 divers who gave a history of an episode of decompression illness involving the central nervous system, we found that eight had unequivocal neurologic deficits implicating multiple supraspinal lesions. Seven of these neurologically impaired divers completed a battery of neuropsychologic tests that revealed severe deficits in all cases. The findings show that diffuse and multiple central nervous system lesions result from decompression illness and demonstrate the importance and close correlation of thorough neurologic and neuropsychologic tests in assessment following diving accidents.

Adult↗
PubMed1999

Arterial gas embolism after decompression: correlation with right-to-left shunting.

Paradoxical gas embolism is a possible cause of neurologic sequelae after decompression in divers. The authors detected arterial bubbles after decompression from chamber dives in two of six divers using transcranial Doppler sonography (TCD). Arterial bubbles correlated with the size of right-to-left shunting as diagnosed by contrast TCD. The pathway of spontaneous paradoxical embolism was tracked for the first time, supporting the concept of paradoxical gas embolism as a cause of early neurologic sequelae after decompression in at-risk divers.

Adult↗
PubMed2000

Arteriovenous bubbles following cold water sport dives: relation to right-to-left shunting.

Neurologic injury subsequent to decompression from diving may be due to paradoxical arterialization of venous gas emboli. Of 40 divers who performed 53 open water dives after being tested for a patent foramen ovale (PFO), arterial gas emboli were detected in 7 of 13 dives, which resulted in venous bubbles. In five of these seven dives, there was evidence of a PFO by contrast transcranial Doppler sonography, indicating an increased risk of arterializing venous bubbles in divers with a PFO.

Adult↗