First Aid, 15secs to 30secs
Having been a first aid instructor before I had a family, one thing I noticed about first aid is one strange reason why these kinds of changes are made. Sometimes changes are made because new methods are genuinely found to be safer and more effective (such as using compression bandages for snake bites instead of tornequets). However, sometimes changes are made because the powers that be declare that the former way of teaching was too complex for people to learn and use, and the new method being easier to learn means more people can pass the course, and are less likely to make a mistake during a genuine emergency.
I'd be interested to find out which one was the reason this was changed.
The old method worked well, and I can't see how the new one would be any better for the casualty - assuming the people performing CPR are well trained and know exactly what they are doing. Though I can see one difference - if the person performing CPR was doing it alone, having to give less breaths could give them a little bit more stamina to keep it up for longer as they are less likely to get out of breath themselves. But, that is something that is overcome with a good learned technique and a reasonable level of fitness.
I would say, if you are unfortunate enough to have to perform CPR, go with what you know best. I know I wouldn't want to be relying on someone that was hesitating because someone changed a timing rule for CPR to resuscitate me. I'd want someone that would do their best without having to think about too hard.
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