Since the mid 1950's or about 60 years.
CPR was first demonstrated as a successful technique in 1954, so it's been around 50+ years.
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As long as guns have been around.
As long as the class is certified by the CPR association they should be the same. This is due to the training that is required to make the class certified.
If CPR is successful, it means that the victim has been revived. He must be breathing and pumping blood on their own. Anything else is not successful.
Go to the place (or institution; such as ARC or AHA) where you received your certifications and inquire; if your cards have not been expired for long, you may be able to take the refresher class instead of the full class.
If you are CPR certified, you should have someone call 911 while you start CPR. If you are not CPR certified, find someone around you that is.
49 years
As long as So Random has been around.
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It is possible to get sick by performing CPR on someone, especially when doing rescue breaths. Hands-only CPR is an alternative which involves chest compressions which reduces that risk. Also, if someone has been dead for hours, performing CPR on them would be pointless.
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