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How to perform cardiopulmonary resuscitation (CPR)?

Call (call out to the patient and do a visual check for normal breathing), Call (call for help, dial 119; if there is “automated external defibrillator (AED)” around, ask somebody to fetch it), C (press on the breastbone in the middle of the chest between the nipples for 30 times, with a depression of at least 5 cm), A (open the airway), B (provide mouth-to-mouth breathing)