A practical, step-by-step guide to recognizing cardiac arrest, performing high‑quality CPR, and operating an AED until help arrives.
Check scene and responsiveness (10 seconds)
Ensure the area is safe for you and the victim. Tap and shout: ‘Are you okay?’. If there is no response and the person isn’t breathing or is only gasping, treat as cardiac arrest.
Send someone to call 911 and to bring an AED. If alone with an adult, call first; if alone with a child/infant and you have a mobile phone, call and put on speaker while starting compressions.
High‑quality chest compressions
Expose the chest, place the heel of one hand in the center of the chest on the lower half of the sternum; place the other hand on top.
Compress at least 2 inches (5 cm) for adults and about 2 inches (5 cm) for children; about 1.5 inches (4 cm) for infants.
Rate: 100–120 per minute. Allow full chest recoil. Minimize interruptions to less than 10 seconds.
Switch compressors every 2 minutes if another trained rescuer is available.
Rescue breaths (if trained and able)
After 30 compressions, open the airway using head‑tilt–chin‑lift. For suspected trauma, use jaw thrust if trained.
Give 2 breaths over 1 second each, just enough to see chest rise. Avoid excessive ventilation. Resume compressions immediately.
Using an AED
Turn on the AED and follow voice prompts. Attach pads to a bare, dry chest as shown on the pad diagrams.
Clear the patient during analysis and before delivering a shock. Press the shock button when prompted.
Resume compressions immediately for 2 minutes after the shock or ‘no shock advised’, then re‑analyze.
Pediatric considerations
For children, use pediatric pads and energy if available; if not, use adult pads ensuring they don’t touch.
Infant/child compression ratio can be 30:2 for a single rescuer or 15:2 for two rescuers.
Stop when
The person shows signs of life, trained help takes over, an AED advises to stop, the scene becomes unsafe, or you are too exhausted to continue.
This guide is for education only and does not replace formal certification.