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.
Back in April, researchers from the University of Alberta published a paper based on MRI imaging of finger joints being cracked saying that the popping sound is caused by the collapse of air bubbles that form in the fluid that surrounds our joints - called synovial fluid.