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
Oxygen window in diving decompression at a shallower stop at the same risk, or at the same rate at the same depth at a lower risk, or at an intermediate rate at an intermediate depth at an intermediate risk. Use of 100% oxygen is limited by oxygen toxicity at deeper depths. Convulsions are more likely when the pO exceeds . Technical divers use gas mixes with high ppO in some sectors of the decompression schedule. As an example, a popular decompression gas is 50% nitrox on decompression stops starting at . Where to add the high ppO gas in the schedule depends on what limits