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2. Now put the heel of one hand on the sternum (breastbone) next to the fingers that found the notch.
3. Put your other hand on top of the hand that's in position. Be sure to keep your fingers up off the chest wall. It may be easier to do this if you interlock your fingers.
4. When the victim is a child, you may use one hand for compression, instead of two (Difference 3). The compressions must be 1/3 to 1/2 of the depth of the chest (Difference 4), instead of 1 1/2 to 2 inches in case of an adult. Bring your shoulders directly over the child's sternum and press down, keeping your arm(s) straight.
5. Then completely relax the pressure on the sternum. Don't remove your hands from the victim's sternum, but do let the chest rise to its normal position between compressions.
Relaxation and compression should take equal amounts of time. If you must give both rescue breathing and external chest compressions, the proper rate is 30 chest compressions to 2 breaths. You must compress at a rate of 100 times per minute. Keep interruptions to less than few seconds. Continue administration until help arrives.
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