Cardiopulmonary resuscitation (CPR) is more than just a lifesaving skill. It is a practical demonstration of how science, quick action, and human compassion come together to give someone a second chance. When cardiac arrest strikes, the body is starved of oxygen, and every second counts. In Australia, thousands of people suffer sudden cardiac arrest each year, and survival often depends on whether bystanders know how to respond.
What Happens in Your Body During CPR
When the heart stops beating effectively, the body no longer pumps oxygen-rich blood to the brain and vital organs. Within minutes, brain cells begin to die. This is where CPR steps in.
Although CPR cannot restart the heart on its own, it keeps blood and oxygen flowing until a defibrillator or advanced care becomes available.
Chain of Survival Explained
The chain of survival is a well-established concept that explains the steps needed to give someone the best chance of surviving cardiac arrest:
- Early recognition and calling for help (dial 000 in Australia).
- Early CPR to maintain circulation.
- Early defibrillation using an automated external defibrillator (AED).
- Advanced care from expert and hospital staff.
According to the Australian Resuscitation Council, survival drops by about 10% for every minute without CPR or defibrillation. This is why training more Australians in CPR is so vital.
Step-by-Step Guide: How to Perform CPR
Performing CPR in Australia can mean the difference between life and death. Here are the recognised CPR steps, adapted from ARC guidelines.
Checking Responsiveness & Calling 000
- Ensure the scene is safe.
- Gently tap the person and shout: “Are you okay?”
- If unresponsive and not breathing normally, call 000 immediately.
- Ask someone nearby to fetch an AED.
This first step connects you to emergency services and activates the chain of survival.
Chest Compressions (Depth & Rate)
Chest compressions are the core of CPR.
- Place the heel of one hand on the centre of the chest, with the other hand on top.
- Push hard and fast at a rate of 100–120 compressions per minute.
- Aim for a depth of 5–6 cm in adults.
- Allow full chest recoil after each compression.
Rescue Breaths (When You Can)
If you are trained and willing:
- After 30 compressions, give 2 breaths.
- Tilt the head back, lift the chin, and seal your mouth over theirs.
- Blow steadily for about one second, watching for chest rise.
Continue with cycles of 30 compressions and 2 breaths.
Compression-Only CPR for Untrained Rescuers
If rescue breaths feel unsafe or you’re untrained, do not hesitate to give compression-only CPR. Continuous chest compressions still double or triple the chance of survival compared to doing nothing.
To gain confidence, enrol on our CPR course; these techniques will help you to conquer your fear when saving lives.
Why Early Defibrillation Matters
While CPR buys time, early defibrillation is often what restarts the heart. AEDs (automated external defibrillators) are increasingly available in public spaces like airports, gyms, and offices in Australia.
How Defibrillators Work
AEDs deliver a controlled electric shock that can stop the chaotic rhythm of ventricular fibrillation and allow the heart’s natural pacemaker to resume normal beating.
Modern AEDs are designed for public use: they provide step-by-step voice instructions and will only deliver a shock if it is medically appropriate.
Access to an AED within the first 3–5 minutes of cardiac arrest can increase survival rates by up to 70%.
Learn how to use AEDs in our First Aid courses.
Survival Rates & Real-World CPR Science
The reality is sobering: out-of-hospital cardiac arrest survival rates remain low worldwide. In Australia, research suggests that only around 10% of people survive after such an event. However, where bystander CPR is performed, survival is significantly higher.
One key clinical measure is ROSC (Return of Spontaneous Circulation), when the heart starts beating effectively again after resuscitation. Early, high-quality CPR is strongly linked to ROSC and improved long-term outcomes..
FAQs About CPR
- Do I need to be certified to give CPR?
No. Anyone can and should attempt CPR if they witness a cardiac arrest. However, completing a certified CPR course ensures you learn the correct technique and build confidence. - How long should I continue CPR?
Keep going until:
- The person starts breathing normally,
- An AED arrives,
- expert take over, or
- You are physically unable to continue.
- Can CPR harm the person?
Cracked ribs may occur, but this is far less serious than the consequences of not providing CPR. - What about CPR for infants and children?
The principles are the same, but techniques vary: use two fingers for infants and one hand for children. For more details, consider the Childcare First Aid course. - Is mouth-to-mouth always required?
No. Compression-only CPR is still highly effective, especially if you are untrained or unwilling to give breaths.