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I am sorry to hear about the devastating accident that your son Ahmed has suffered from
While you have not mentioned regarding any neuro-imaging done (like MRI),
however from your description it is quite clear that extensive damage to the brain has taken place during the strangulation
It is infact a miracle that he is alive
The good news is that whatever damage has been done will not worsen with the passage of time, and his functioning would improve with the supportive treatment that is being provided
and given his extensive and severe symptoms, he will not become normal even with the best possible treatment