Description given on Youtube:
Find out how to give an CPR: http://www.sja.org.uk/sja/first-aid-advice/lifesaving-procedures/cpr.aspx
Learning how to give someone CPR could help keep them alive until an ambulance arrives. If you have found out that someone is unconscious and not breathing using the primary survey, you will need to give them CPR. A St John Ambulance trainer shows you how to give CPR in this video.
Learn more life saving skills with St John Ambulance first aid training courses: http://www.sja.org.uk/sja/first-aid-training-courses.aspx
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