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.
Less frequently, a popliteal cyst arises quickly due to a knee cartilage, muscle or ligament injury. These cysts often produce a visible lump at the back of the knee, accompanied by achy pain. There may be pain or difficulty when bending or fully straightening the knee.