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Diving04 - 2 Pneumothorax Lung Collapse Rupture of alveoli...

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Unformatted text preview: 2. Pneumothorax: Lung Collapse Rupture of alveoli 9 air pocket forms outside the lungs between the chest wall and lung tissue 9 continued expansion of this trapped air during ascent causes the ruptured lung to collapse 3. Nitrogen Narcosis At depths over 100 ft., the increased partial pressure and quantity of dissolved nitrogen produces an anesthetic effect on the central nervous system - effects similar to alcohol intoxication 9 decreased awareness of cold, hallucinations, decreased attentiveness, reckless behaviour Dependent primarily on the depth of the dive and secondarily on the length of time at that depth. 4. The Bends Also called "decompression sickness" If the diver ascends to the surface too rapidly after a deep, prolonged dive, dissolved nitrogen moves out of solution and forms bubbles in body tissues and fluids. Pain is usually first felt around joints within four to six hours after the dive. lf bubbles lodge in an artery 9 permanent damage or death. Treatment: recompression in a hyperbaric chamber to force the nitrogen gas back into solution and then slow decompression Prevention: - ascend to the surface in stages - decompression stops to allow sufficient time for nitrogen to diffuse from the tissues to the blood without bubbles forming. - follow the recommendations of standard decompression tables with regard to ascent patterns ...
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