Compression-only CPR without rescue breaths is nearly as effective for adult cardiac arrest and removes the biggest barrier to bystander action.
Cardiac arrest kills more than 350,000 people in the United States alone every year — and approximately 70% of those arrests happen at home or in public, witnessed by a bystander who could intervene. Yet fewer than half of out-of-hospital cardiac arrest victims receive CPR from a bystander before emergency services arrive.
The single biggest reason: people are afraid to give rescue breaths.
Hands-Only CPR — compression-only resuscitation without mouth-to-mouth ventilation — removes that barrier. The American Heart Association, the British Heart Foundation, and resuscitation councils worldwide now actively promote Hands-Only CPR for untrained bystanders, because any attempt at resuscitation is almost always better than doing nothing.
During the first several minutes of a witnessed cardiac arrest in an adult, the blood still circulating in the lungs and bloodstream contains enough dissolved oxygen to sustain the brain and vital organs — provided that blood keeps moving. Chest compressions keep blood moving.
Rescue breaths become progressively more important after approximately 4–6 minutes, as the oxygen reserve depletes. But in the critical first minutes after a witnessed collapse, compressions alone provide meaningful benefit.
Studies comparing Hands-Only CPR with conventional CPR for witnessed out-of-hospital cardiac arrest in adults consistently show comparable outcomes. A landmark 2010 New England Journal of Medicine study found no significant difference in survival rates between compression-only CPR and standard CPR for non-asphyxial cardiac arrests.
⚠️ Hands-Only CPR is appropriate for witnessed adult cardiac arrest. If the cause is drowning, drug overdose, or airway obstruction — or if the patient is a child or infant — rescue breaths are important. See the full CPR guide for those situations.
Before beginning CPR, confirm you are dealing with cardiac arrest and not another condition.
| Condition | Signs | Action |
|---|---|---|
| Cardiac arrest | Unresponsive, no normal breathing (may have agonal gasps), no pulse (for trained providers) | Call 999/911, begin CPR, use AED |
| Heart attack | Conscious, chest pain, sweating, nausea, shortness of breath | Call 999/911, give aspirin 300 mg (if appropriate), monitor |
| Stroke | Face drooping, arm weakness, speech difficulty (FAST test), conscious | Call 999/911, recovery position if unconscious |
| Faint/syncope | Brief loss of consciousness, quickly recovers, normal breathing | Lay flat, raise legs, monitor |
| Seizure | Rhythmic convulsions, usually short-lived | Protect from injury, recovery position after, call if > 5 min |
Agonal breathing is a critical recognition point. This reflex gasping — slow, irregular, gurgling breaths — occurs in many cardiac arrests in the first minutes and is NOT normal breathing. Treat agonal breathing as cardiac arrest and begin CPR immediately.
Ensure the area is safe for you and the patient. If there is danger (traffic, fire, electrical hazard), manage it before approaching or move the patient only if absolutely necessary.
Tap the person's shoulders firmly and shout: "Are you okay? Can you hear me?" If no response, proceed immediately.
Shout for bystanders. Point at a specific person and say: "You — call 999 now and come back to tell me it's done." If alone, call emergency services yourself and put the phone on speaker before starting compressions.
Scan the chest for 10 seconds. Look for normal rise and fall. Agonal gasping = treat as cardiac arrest.
Getting rate and depth right maximises cardiac output during CPR. Both under- and over-compression are harmful.
| Parameter | Target | Common Mistake |
|---|---|---|
| Rate | 100–120 compressions per minute | Too slow (< 80) or too fast (> 130) |
| Depth | 5–6 cm (2–2.4 inches) for adults | Too shallow (< 4 cm) — commonest error |
| Recoil | Full chest recoil after each compression | Leaning on chest between compressions |
| Interruptions | Minimise — no pause > 10 seconds | Stopping to check for pulse, waiting for AED |
| Hand position | Centre of chest, lower sternum | Over xiphoid process (tip of sternum) |
The "Stayin' Alive" rhythm cue works well. At approximately 104 beats per minute, it falls comfortably within the target window. Several CPR metronome apps are available for download if you want to practise.
Each compression squeezes blood out of the heart. The recoil phase allows the heart to refill before the next compression. If you lean on the chest between compressions, the heart never fully refills and cardiac output drops significantly — studies suggest incomplete recoil can reduce survival rates by 20–30%.
After each compression, deliberately lift the weight of your hands off the chest while keeping contact with the skin. This is a conscious technique that requires practice to do automatically.
CPR is physically demanding. Effective compressions require significant upper body force. After approximately 2 minutes of compressions, fatigue causes compression depth to decline — often without the rescuer realising it.
If a second person is present:
Many people are unprepared for the physical sensations of CPR on a real patient:
Start Hands-Only CPR if:
Continue until:
Do NOT stop to check for a pulse unless the patient shows clear signs of recovery. Checking for a pulse interrupts compressions and is notoriously unreliable for untrained providers.
| Key Point | Detail |
|---|---|
| For whom | Witnessed adult cardiac arrest |
| When compressions only is acceptable | Untrained bystander, discomfort with breaths, no barrier device available |
| Rate | 100–120 per minute |
| Depth | 5–6 cm / 2–2.4 inches |
| Hand position | Centre of chest, lower sternum |
| Recoil | Full recoil between every compression |
| Swap helpers | Every 2 minutes to prevent fatigue |
| Rib fracture during CPR | Do not stop — acceptable risk |
| When to add breaths | Drowning, asphyxia, children, trained providers |
| Survival benefit | Comparable to conventional CPR in first 4–6 minutes of witnessed VF arrest |
The survival benefit of bystander CPR is unambiguous. Even imperfect CPR — slightly shallow compressions, imperfect rate — is dramatically better than no CPR. A bystander who acts within the first two minutes of cardiac arrest can double or triple the patient's chance of survival.
Hands-Only CPR removes every excuse for inaction. You do not need training, equipment, or confidence in rescue breaths. You need only your two hands and the willingness to use them.
Take Hands-Only CPR — The Technique Everyone Must Know with you — no internet needed when it matters most.
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