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In all honesty it is better to just keep on with the chest compressions then stopping to try and provide breaths.
Compression's keep the blood flowing and by the time you have done 30 you have only started to build some blood pressure in the body so while you stop to ventilate you've just lost what you made.
Along with this is that when a person is lying on their back they naturally get 16% of oxygen through gravity where as when you breath for them we only exhale 23%. Minimal gain.
As a paramedic there is nothing better then turning up to some one in cardiac arrest and having good CPR done. Get your first aid cert guys!!
Remember, in the center of the chest, push down about 1/3 the depth at a rate of 100 per minute. If you go to fast your not letting the heart fill up with blood to be able to pump. (I also see this alot) If you can do compression to the beat of staying alive by the beegees. Ah Ah Ah Ah staying alive.