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In page Chain of survival:
"To be most effective, bystanders should provide CPR immediately after a patient collapses. In their 2015 guidelines, the American Heart Association re-emphasized the importance of more bystanders performing hands-only CPR until EMS personnel arrive because, at present, fewer than 40% of people who have an out-of-hospital cardiac arrest receive CPR from a bystander.[1] The guidelines recommend lay rescuers start CPR on a person with presumed cardiac arrest because the overall risk of harm to patients from CPR is low, even if their heart hasn't stopped beating.[1] Properly performed CPR can keep the heart in a shockable rhythm for 10–12 minutes longer.[citation needed]
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