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.
Hereâs the science behind the pop: Every joint is encased in a capsule that contains synovial fluid, a nutrient-rich lubricant. When you crack your neck or bend your finger a certain way, you stretch the capsule and lower the pressure inside it, creating a vacuum. That vacuum is quickly filled by gases (nitrogen, carbon dioxide), which are released when you burst the bubble.