Compression in CPR: What “CAB” Means in CPR
What “CAB” Means in CPR — And Why It Matters
CAB stands for Compressions – Airway – Breathing, and it’s the sequence recommended in modern CPR guidelines. It replaced the older ABC approach to make sure the most critical action happens first.
Why the order changed
In cardiac arrest, the heart is no longer pumping effectively, so the most urgent priority is to restore blood flow to the brain and vital organs.
Research reviewed by the American Heart Association (AHA) showed that delays in starting chest compressions significantly reduce survival rates, which led to the 2010 cpr update shifting from ABC to CAB.
The AHA’s evidence review found that beginning CPR with compressions results in faster initiation of circulation, while the older ABC sequence often caused rescuers to spend too long opening the airway and giving breaths before compressions began.
What each ‘CAB’ step involves in first aid:
- C – Compressions: Start chest compressions immediately. This keeps oxygenated blood moving around the body and dramatically improves survival chances.
- A – Airway: Once compressions are underway, open the airway using the head‑tilt, chin‑lift technique.
- B – Breathing: Give rescue breaths if you’re trained and able, supporting oxygen delivery to the lungs.
🚨Important Note
For infants, children, or drowning victims, some organisations (such as the American Red Cross) may still recommend an ABC approach. In these cases, cardiac arrest is more likely caused by breathing problems, so opening the airway and giving breaths first can be more effective.
Why Compressions Come First in CPR
Compressions come first in CPR because they immediately restore the flow of oxygenated blood to the brain and heart — the single most critical factor for survival in adult cardiac arrest.
Starting with compressions rather than rescue breaths reduces delays, keeps oxygen circulating during the first vital minutes, and increases the chance of survival.
5 Key Reasons for Compressions‑First CPR
1. Immediate Circulation Is Needed
In cardiac arrest, the heart has stopped pumping. Chest compressions act as a manual pump, generating the pressure needed to move blood around the body.
2. Oxygen Is Already in the Blood
Most adults in cardiac arrest still have several minutes of oxygen in their bloodstream. The limiting factor isn’t oxygen, it’s the lack of circulation to deliver it. Compressions fix that instantly.
3. Reducing Delays Saves Lives
The older A‑B‑C method often delayed compressions by up to 30 seconds while rescuers opened the airway and gave breaths. Switching to C‑A‑B ensures blood flow begins immediately, which research shows improves survival.
4. Preventing Brain Damage
Irreversible brain damage can begin within minutes without oxygenated blood. Effective, uninterrupted compressions at 100–120 per minute help protect the brain until advanced help arrives.
5. Compressions Are the Most Important Step in Adult Resuscitation
For most adult cardiac arrests, compressions provide the greatest impact on survival. This is why modern guidelines emphasise early, continuous, high‑quality compressions above all else.
Final Note: Learn It. Practise It.
Understanding why compressions come first is vital — but knowing isn’t enough. CPR saves lives when it’s done confidently, quickly, and correctly. That’s why hands‑on training matters.
We strongly encourage everyone to complete practical CPR and AED training. You can join our next practical basic life support training (3 hrs). You’ll learn how to deliver high‑quality compressions, use a defibrillator (AED), and respond effectively in real emergencies.
Be ready. Be confident. Be the difference.
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