hello sir i wanted to consult about my uncle he is a kidney paitent and three days before due to sevear u neasyness he took sleeping injection and painkillers in large quntity his pulse had stopped doctors here tried hard and got his pulse back but now he is not responding they say oxygen didnt reach his brain for three minute he is showin unusual breathing pattern and only responding to very loud noises by opening eyes is this state of koma can he come back from here he actually also requires dialysis frm time to time plus he is a diabetic paitent