First aid is given to the person concerned as soon as possible. First aid is also needed for a patient of heart attack. 

But without having good knowledge of different kinds of first aid we should not administer any first aid. First aid is very essential to save one's life. In many cases it happens proper first  aid can save a man's life.

 

An electrocuted person should be taken away from the electric contact immediately and carefully . Similarly a drowned person should be taken out of water and water from his stomach should be squeezed out . The nature of first aid is different for different kinds of injury and accidents.