do not attempt cardiopulmonary resuscitation

Since its introduction in the 1960s as a treatment to restart the heart after sudden cardiac arrest from a heart attack, attempts at cardiopulmonary resuscitation have become more common in other clinical situations. Cardiopulmonary resuscitation can be a lifesaving treatment, with the likelihood of recovery varying greatly depending on individual circumstances; however, overall, the proportion of people who survive following cardiopulmonary resuscitation is relatively low.