also called a 'no code,' a DNR is usually placed on a patient's medical chart to indicate there should be no attempt to restart a failed heartbeat or apply cardiopulmonary resuscitation (CPR) to restore normal breathing. A DNR order can be changed and experts say it should be reviewed regularly. In a DNR situation, a patient is still provided comfort care. Without such an order, emergency medical technicians are legally required to perform CPR.