At the moment he is in a critical condition. This means that he will be in an induced ( forced ) coma. This will allow his body to revert to it's primal instinct and concentrate on survival. All outside influences and thought are taken away, basically leaving the body's in-built mechanisms supplying all of it's natural resources, supplying nutrients and chemicals to the vital organs. Along with the expert medical care and administration of life saving drugs this will increase his chance of survival. If he does survive there will definatly be a detrimental effect to his future well being. This will only become apparent after at least 48 - 72 hours after the initial trauma.
The detriment of this can range from mild brain damage to complete paralysis.
Only time will tell.