One minute they're walking along and talking, the next they're on the floor, not breathing and with no pulse. And what you do over the next 10 minutes will be the difference between life and death.
Each year in Australia about 20,000 people have a cardiac arrest out of hospital, but only 10 per cent of these people will survive.
A cardiac arrest is when your heart suddenly stops pumping. This means your brain is quickly starved of oxygen, you become unconscious and stop breathing.
It takes only three minutes for brain damage to set in and within 10 minutes the person has usually died. In most cases the ambulance will not make it in time.
A new video aims to educate otherwise untrained Australians on how to help someone in cardiac arrest.
Having untrained bystanders able to provide first aid is vital because people in cardiac arrest can die so quickly, Dr MacIntyre said.
"If you give no CPR, for every minute that the patient doesn't receive CPR there's a 10 per cent reduction in survival. So in 10 minutes they're dead," he said.
"Any attempt at resuscitation is better than no attempt, and that's what potentially saves lives."
Having the confidence to use an AED where there's one available was also critical, Dr MacIntyre said.
"Anyone can use an AED, [the machine] talks you through it," Dr MacIntyre said.
Studies have shown defibrillation within three to five minutes can produce survival rates as high as 50 per cent to 70 per cent.
Defibrillators are increasingly installed in public places, such as schools, sports clubs, shopping centres and public libraries.
Some states, such as South Australia, now have a public register of defibrillators to help you find the nearest one to you.
See the new CPR campaign from the Rake team:
Cardiac arrest or heart attack?
Automated external defibrillators are increasingly installed in public areas and are designed to be used by untrained people.
(ABC News: Sonya Gee)
Both a heart attack and a cardiac arrest are medical emergencies involving your heart that require immediate treatment, but they are not the same thing.
A heart attack occurs when there's a blockage in an artery leading to your heart:
Heart muscle begins to die due to reduced blood flow, and therefore oxygen to the muscle
Can cause permanent damage to the heart and can be fatal
Heart usually doesn't stop beating, unless your heart attack causes a cardiac arrest
Technical terms are coronary thrombosis (a clot in a coronary artery) or myocardial infarction (meaning damage to the heart muscle)
A heart attack is a life-threatening emergency. Call triple-0.
A cardiac arrest is an electrical malfunction:
The heart's rhythm is disrupted and it stops pumping blood around your body
Brain, lungs and other vital organs are starved of oxygen due to lack of blood flow, so you soon lose consciousness and stop breathing
Death within minutes without emergency treatment
A person in cardiac arrest will have no pulse and won't be breathing. Call triple-0 and start CPR immediately.
Credit to: ABC Health & Wellbeing
By Tegan Taylor
13 February 2018