The method of delivering chest compressions remains the same, as does the rate (at least 100 per minute). It is hoped that the use of compression-only delivery will increase the chances of the lay public delivering CPR.
Much like when crack your knuckles, loud popping noises from your knees are most likely caused by what is called cavitation. Cavitation results from a change in joint pressure that allows carbon dioxide, which is normally dissolved in your joint fluidâa.k.a.
If knee popping occurs without any associated pain, it is usually due to either gas bubbles building up inside the joint which burst, or ligaments/tendons snapping over the joint. Changes in joint pressure can cause tiny bubbles of gas to slowly form in joints.