Scuba divers, snorkelers and swimmers should be aware that one of the major causes of death on, under or about the water is a heart attack.  Many people are afraid to perform CPR for a few reasons.  One of the most common reasons given is having to do mouth-to-mouth  breathing.  New research suggest this may not be necessary. 

Chest Compressions, Not Mouth-to Mouth, Best For Heart Attacks

I have been a First Aid/CPR/AED instructor and was updated to the new CPR methods which included 30 compressions(at the rate of 100 copressions/minute) and 2 breaths for cardiac incidents.  However, new information and studies now show that for most cardiac incidents it is better to use ONLY compressions, eliminating the mouth-to-mouth breathing.  This new method has shown a significant increase rate of survival.  I expect that both the American Heart Assoication, The National Safety Council and the American Red Cross will be updating their methods within the next 2 years.