First Aid Trick #2: CPRComing in at #2 on our top 5 first aid tricks everyone should know list is CPR. (Note: “cardiac arrest” and “heart attack” are not the same thing, more in the Bonus Facts below.) According to the AHA, immediate CPR for someone in cardiac arrest will increase their chance of survival by 300%. In this situation, CPR is one of the only first aid tricks that will save their life. Because of this, and because it has become so easy to do, CPR makes it to #2 on our Top 5 First Aid Tricks Everyone Should Know list.