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.
Joint noise in the form of crackling, clicking or popping is very common. It may be from simple soft tissue catching or more serious damage to the bearing surface of the joint, the articular cartilage. What I tell my patients is that unless it is causing pain, swelling or the knee is giving way, it is nothing to worry about.