Heart attack

A heart attack occurs when a blood clot blocks one or more of the arteries that supply blood to the heart muscle. 

If a blood clot forms in a narrowed artery and completely blocks the blood supply to a part of your heart, it will cause a heart attack. The severity of the heart attack depends on how much heart muscle is permanently damaged.

Warning signs of heart attack vary from person to person and they may not always be sudden or severe.

Read more about causes, signs and symptoms.

First aid for a heart attack

If someone is having a heart attack, you should call Triple Zero (000) immediately. Send for a nearby defibrillator if available.

If they're experiencing the signs of an attack, it's important to call Triple Zero (000) even if you're unsure. This is because:

• The call-taker will decide if you need an ambulance
• They will receive treatment quicker
• You will receive advice on what to do while waiting for the ambulance

If the person is awake, follow the First Aid steps below.

Step 1: Rest and reassure

• Sit them down
• Ensure they're in a comfortable, upright position
• Reassure and keep them calm
  
  

Step 2: Ask them about existing medications

• Ask them if they have prescribed medication for an existing condition
• If they do, help them to take this medication as directed by their doctor
  
  

Step 3: Stay with them

• Stay with them until an ambulance arrives
• Monitor their symptoms to make sure they aren't getting worse
• Talk to them to keep them calm and help them stay awake
• If they lose consciousness, follow the DRSABCD Action Plan