Summary of High-Quality CPR Components for BLS Providers
*Compression depth should be no more than 2.4 inches (6 cm).
Abbreviations: AED, automated external defibrillator; AP, anteroposterior; CPR, cardiopulmonary resuscitation.
Component Adults and Adolescents Children
(Age 1 Year to Puberty)
Infants
(Age Less Than 1 Year, Excluding Newborns)
Scene safety Make sure the environment is safe for rescuers and victim
Recognition of cardiac arrest

Check for responsiveness

No breathing or only gasping (ie, no normal breathing)

No definite pulse felt within 10 seconds

(Breathing and pulse check can be performed simultaneously in less than 10 seconds)

Activation of emergency response system

If you are alone with no mobile phone, leave the victim to activate the emergency response system and get the AED before beginning CPR

Otherwise, send someone and begin CPR immediately; use the AED as soon as it is available

Witnessed collapse

Follow steps for adults and adolescents on the left
Unwitnessed collapse

Give 2 minutes of CPR

Leave the victim to activate the emergency response system and get the AED

Return to the child or infant and resume CPR; use the AED as soon as it is available

Compression-ventilation ratio without advanced airway 1 or 2 rescuers

30:2
1 rescuer

30:2
2 or more rescuers

15:2
Compression-ventilation ratio with advanced airway

Continuous compressions at a rate of 100-120/min

Give 1 breath every 6 seconds (10 breaths/min)

Compression rate 100-120/min
Compression depth At least 2 inches (5 cm)*

At least one-third AP diameter of chest

About 2 inches (5 cm)

At least one-third AP diameter of chest

About 1 1⁄2 inches (4 cm)

Hand placement 2 hands on the lower half of the breastbone (sternum) 2 hands or 1 hand (optional for very small child) on the lower half of the breastbone (sternum)
1 rescuer

2 fingers in the center of the chest, just below the nipple line
2 or more rescuers

2 thumb–encircling hands in the center of the chest, just below the nipple line
Chest recoil Allow full recoil of chest after each compression; do not lean on the chest after each compression
Minimizing interruptions Limit interruptions in chest compressions to less than 10 seconds