Endocarditis. Anoxic brain injury can occur after cardiac arrest. The heart disease you mention could lead to cardiac arrest but you did not mention this in your history. I am concerned about endocarditis, infection of the heart valve, with history of mssa bacteremia.
For . For "moderate anoxic brain damage" to occur the patient would have to have experienced cardio-respiratory arrest for more than 5 minutes. This person was quite fluid overloaded but with normal o2 sats, hypoxia and anoxia are not occuring.