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.
Another common problem that results in a popping or grinding sensation is roughness on the undersurface of the patella that used to be called chondromalacia and is often labeled as patellofemoral pain syndrome, or runnerâs knee. Often you may feel the popping, grinding or crunching more than you can hear it. To feel this, try squatting with your hand flat over the front of your knee. Real worry: When a patient says to me, âDoc, I heard a pop and my knee swelled,â it is definitely a cause for concern.