Welcome to HealthcareMagic.What you have mentioned is cerebral hypoxia
due to brain injury
as a result of decreased oxygenation ie, hypoxia.If it is mild or moderate hypoxia does not have much impact but severe cerebral hypoxia is bad. Outcome depends on how much immedietly and effectively cerebral damage control measures are taken, the amount of brain tissue deprived of oxygen, and the speed with which oxygen was restored to the brain.If patient is in coma
, it generally indicates long term damage and there are chances of him remaining in a vegetative state as long,and chances of getting back to normal functioning is less as long as alive or there are even chances of brain to heal but which is rare.As you mentioned, Hyperbaric Oxygen Therapy HBOT
may be used but there is yet insufficient evidence for its use.So basically it is just a symptomatic treatment which am sure your dad must be getting the best of it right now.I hope i could answer your query. And in future too, please do write in to us.Understanding your state of mind, I as part of HealthcareMagic sympathise with you and pray for your dad. Take care.