A do-not-resuscitate (DNR) order is a document placed in a person’s medical record by a doctor. It informs the medical staff at a hospital that cardiopulmonary resuscitation (CPR) should not be attempted if a person’s heart and/or breathing stops. CPR is often followed by more drastic measures such as use of electric shocks to the heart or insertion of a breathing tube; a DNR order stops these measures as well. When administered near the end of life, what is the success rate of CPR?