Photo: Erik Mclean

How long can you do CPR before brain damage?

See cpr.heart.org/en/course-catalog-search for classes near you. Time is very important when an unconscious person is not breathing. Permanent brain damage begins after only 4 minutes without oxygen, and death can occur as soon as 4 to 6 minutes later.

medlineplus.gov - CPR - adult and child after onset of puberty - MedlinePlus

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1. Check for responsiveness. Shake or tap the person gently. See if the person moves or makes a noise. Shout, "Are you OK?" 2. Call 911 or the local emergency number if there is no response. Shout for help and send someone to call 911 or the local emergency number. If you are alone, call 911 or the local emergency number and retrieve an AED (if available), even if you have to leave the person. 3. Carefully place the person on their back. If there is a chance the person has a spinal injury, two people should move the person to prevent the head and neck from twisting.

4. Perform chest compressions:

Place the heel of one hand on the breastbone -- right between the nipples. Place the heel of your other hand on top of the first hand.

Position your body directly over your hands.

Give 30 chest compressions. These compressions should be fast and hard. Press down about 2 inches (5 centimeters) into the chest. Each time, let the chest rise completely. Count the 30 compressions quickly: "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30, off". 5. Open the airway. Lift up the chin with 2 fingers. At the same time, tilt the head by pushing down on the forehead with the other hand. 6. Look, listen, and feel for breathing. Place your ear close to the person's mouth and nose. Watch for chest movement. Feel for breath on your cheek.

7. If the person is not breathing or has trouble breathing:

Cover their mouth tightly with your mouth.

Keep the chin lifted and head tilted.

Give 2 rescue breaths. Each breath should take about a second and make the chest rise. 8. Repeat chest compressions and rescue breathing until the person recovers or help arrives. If an AED for adults is available, use it as soon as possible. If the person starts breathing again, place them in the recovery position. Keep checking for breathing until help arrives.

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