What is the first corrective action for a suspected case of DCS?

In cases of suspected Decompression Sickness (DCS), the first corrective action is to administer 100% oxygen to the affected individual. This is essential because inhaling pure oxygen helps to reduce the size of the nitrogen bubbles that form in the tissues and bloodstream during DCS. By doing so, it assists the body in eliminating excess nitrogen more efficiently and relieves symptoms faster. Providing 100% oxygen significantly increases the partial pressure of oxygen available to the tissues, which aids in the resorption of nitrogen and mitigates further complications.

Additionally, while immobilizing the affected area, landing as soon as practical, and seeking medical assistance are all important steps to incorporate later in the response to DCS, they are not as immediately critical as oxygen administration. Oxygen therapy should be the priority to address the root cause of the symptoms, as it directly impacts the treatment outcome and can lead to rapid improvement in the patient's condition.