Cardiopulmonary Resuscitation (CPR) is essentially a method to replace the heart and lung function in the event of physical failure or malfunction. CPR is the combination of artificial circulation (giving chest compressions) and rescue breathing (mouth-to-mouth breathing). Either chest compressions combined with mouth to mouth breathing or chest compressions alone should be performed in a set method immediately when a casualty stops breathing or her/his heart stops. CPR can be performed by trained or untrained persons. Periodic retraining is highly recommended for CPR.
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