will the patient die if the medical team do it too late from a hear attack? if so, why?

Question: will the patient die if the medical team do it too late from a hear attack? if so, why?
- Keywords:
  die,
  heart attack,
  late,
  patient
Asked by phguan to Loan on 15 Nov 2015.
- Loan Nguyen answered on 15 Nov 2015:
  
  Hi,
  I will try my best to answer your question. I hope you are referring to cardiopulmonary resuscitation (CPR), apologies if you are not.
  
  It is very important that we do immediately after a heart attack to keep blood pumping through the body, as blood carries oxygen to our vital organs. Every organ in our body will need a constant supply of oxygen for it to function healthily. The brain is especially sensitive to lost of oxygen and can only survive for around 4 mins, after this the brain will begin to die. Lost of oxygen supply to the brain for approximately 10 mins will cause death of the person. If CPR starts after 4 mins and before 10 mins, the patient will suffer some loss of bodily function. If CPR starts immediately after a heart attack and continues until the arrival of medical support, the chances of rescuing the patient is greatly increased. CPR can sometimes continue for upto 40-50 mins for a person to be declared dead by a doctor.
  
  I hope I have answered your question. If you have any other query please send it to me.
  
  Loan

Question: will the patient die if the medical team do it too late from a hear attack? if so, why?