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You can put an automatic external defibrillator on the patient to get their heart rhythm back to normal.
This step is not required for hands only CPR.

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You give rescue breathing by blowing two breaths in their mouth.
In hands only CPR you are not required to do this.

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If there is no breathing, you must start CPR by holding one hand on top of another and given 30 chest compression to an adult. You must deliver 100 compression per minute and they must be 2 inches deep.

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Check their breathing by putting your ear on top of their mouth and looking at their chest to see if it rises. You do this for 10 seconds.

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Open their airway by either using the jaw thrust maneuver or head tilt chin lift

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You have to call 911

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You have to check for scene safety and ask the person if they are okay in order to find out if they are actually having some kind of incident.