Why is oxygen recommended for DCS first aid?

Oxygen is recommended for first aid in cases of Decompression Sickness (DCS) primarily because it raises blood oxygen levels in the body. When divers ascend too quickly or experience a significant drop in pressure, nitrogen bubbles can form in the body, leading to various symptoms of DCS. Inhaling pure oxygen helps reduce the size of these nitrogen bubbles and enhances the body's ability to expel nitrogen from the tissues.

This increased availability of oxygen also supports metabolic processes, promotes healing, and can alleviate symptoms of DCS. The hyperbaric environment enhances the diffusion of oxygen into the tissues and can significantly improve outcomes for affected divers. Thus, administering oxygen is a crucial step in the management of DCS, as it directly addresses the physiological challenges caused by the condition.