Here is video of CNN's Dr. Sanjay Gupta showing actor Matthew McConaughey what he calls a "new way" of doing CPR.
Gupta says new studies show that doing chest compressions only on a cardiac arrest patient is just as effective - if not better - than if mouth-to-mouth is also done. Gupta said you have "8-10 minutes of oxygenated blood" in your body anyway, and the key is to keep that blood moving. So, according to Gupta, it is better to not interrupt the chest compressions for anything while you wait for paramedics to arrive. He also said more people will be willing to help and get involved if they don't have to do mouth-to-mouth.
McConaughey demonstrates the procedure.
The American Heart Association website actually advocates using the compression-only method for bystanders who witness sudden cardiac arrest, particularly bystanders not trained in CPR, or who may have some training, but are not confident in their ability to do it. The AHA says trained medical personnel should still use the conventional method for CPR.