What is the main treatment for a diver experiencing a shallow water blackout?

The primary treatment for a diver experiencing a shallow water blackout involves administering 100% oxygen and closely monitoring the diver. The reason for this approach lies in the physiological impact of a blackout, which typically occurs due to a significant drop in blood oxygen levels and potential hypercapnia (elevated levels of carbon dioxide in the blood).

Providing 100% oxygen serves to rapidly increase the oxygen saturation in the diver’s bloodstream, which can help mitigate hypoxia (deficiency of oxygen). This immediate response is critical, as the brain is particularly sensitive to low oxygen levels, and quick intervention can prevent further complications, such as neurological damage.

Monitoring is also essential in this situation to observe the diver for any additional symptoms or complications that may arise during recovery. The medical team needs to assess the diver to ensure they return to a stable condition.

The other choices do not address the immediate and critical needs of a diver with a shallow water blackout and could lead to further complications if not managed appropriately.