What are the potential risks of using enriched air nitrogen (EANx) during deep dives?

The potential risks of using enriched air nitrogen (EANx) during deep dives primarily relate to the higher partial pressures of oxygen that come into play with its use. When divers use EANx, they are typically breathing gas mixtures that contain a higher percentage of oxygen than regular air. At greater depths, the partial pressure of oxygen can exceed safe limits, leading to a condition known as oxygen toxicity.

Oxygen toxicity can manifest through various symptoms including visual disturbances, nausea, twitching, and even seizures at extreme levels. This is particularly concerning for deep divers who may already be at heightened risk due to the pressures and conditions associated with deep diving. Therefore, it is essential for divers to be aware of their dive profiles and the oxygen levels in their gas mixtures to avoid exceeding safe partial pressure limits.

Other options, while they may present risks in diving generally, do not specifically address the unique aspects of using enriched air nitrogen. Hypothermia relates more to temperature exposure rather than gas composition, and buoyancy control issues or reduced visibility do not directly stem from the effects of oxygen levels in EANx. Understanding the nuances of EANx use is vital for ensuring divers can manage their exposure to oxygen and mitigate the associated risks effectively.