While CPR, or cardiopulmonary resuscitation, is a potentially life-saving procedure, it can also be invasive and traumatic. CPR can require chest compressions, attempted defibrillation, injection of drugs and ventilation of the lungs, and is often followed by prolonged treatment in an intensive care unit. Depending on the physical condition of the person receiving CPR, there is the risk of broken bones and internal injuries arising from the procedure itself, as well as the risk that the person may be left with brain damage and resulting disability, especially if CPR is delayed.