Decompression sickness lessen the pressure reduction, and hence the risk of DCS. All cases of decompression sickness should be treated initially with 100% oxygen until hyperbaric oxygen therapy (100% oxygen delivered in a high-pressure chamber) can be provided. Mild cases of the "bends" and some skin symptoms may disappear during descent from high altitude; however, it is recommended that these cases still be evaluated. Neurological symptoms, pulmonary symptoms, and mottled or marbled skin lesions should be treated with hyperbaric oxygen therapy if seen within 10 to 14 days of development. Recompression on air was shown to be an effective treatment for minor
Investigation of diving accidents a gas may be toxic or insufficient to support consciousness if used at an inappropriate depth, and the inert gas components will not be correctly accounted for in decompression calculations, which might result in decompression sickness. Both oxygen toxicuty and hypoxia may render the diver unconscious without warning, and decompression sickness symptoms may be debilitating if severe, and are generally unexpected. Open circuit scuba is generally very reliable if correctly maintained and serviced, and tested before the dive. Maintenance and testing procedures are simple and few in number, nevertheless divers may neglect them due to complacency, distraction or incompetence. Rebreather