I'm a lifeguard and am qualified to teach CPR.
2 breathes to 30 compressions.
If you're doing it right, you will break ribs.
If a bystander is not trained in CPR, he/she should provide compression only CPR for an adult who suddenly collapses.
All trained rescuers should, at a minimum, provide chest compressions for victims. But if you have 2 bystanders, you should be able to do both compressions and ventilations.
Studies have shown that CPR that combines chest compressions and ventilations is the most effective method for treating children and infants, because cardiac arrest in children and infants is typically secondary to conditions that compromise or prevent breathing (drowning/choking).
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