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.
Cracking the neck joint (also called neck popping) or any joint actually leads to release of fluid or gas within the joints. It is an effect of a sudden development of temporary vacuum develops and is filled by gas, which was trapped in the joint fluid. Thus, when you stretch that joint, 'pop' or crack it goes.