What is the recommended next step after a second O2 toxicity hit that is not a convulsion?

In cases of oxygen toxicity, particularly after experiencing a second hit that does not manifest as a convulsion, gradual ascent is often the recommended course of action. Ascending at a rate of 1 foot per minute after a second oxygen exposure helps to mitigate the potential risks associated with further oxygen toxicity and allows the diver's body to alleviate the effects of elevated oxygen levels gradually.

This slow ascent is essential to ensure that the diver's body can adapt to the changing pressure and oxygen levels, decreasing the risk of further complications. Immediate resumption of oxygen or a rapid ascent could exacerbate the situation and potentially lead to dangerous outcomes.

While the option of waiting for advice from the Diving Medical Officer (DMO) is important in certain contexts, immediate actions often need to be taken to address the physiological risks associated with oxygen toxicity effectively. The careful ascent allows for monitoring of symptoms and provides a more conservative approach to safe recovery.