In a case of a sudden cardiac arrest one should know what to do and how to do it. Numerous studies have shown that the correct CPR increases the likelihood of survival and recovery.
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This app is giving you a rate at which CPR should be done in order to maximise a positive outcome, which of course cannot be guaranteed, since you are dealing with a stopped heart. But doing the right thing at the right time is better than nothing.
The rate is based on studies of theCenter of Resuscitation Science - University of Pennsylvania - and numerous studies all over the world.