What is meant by temporary revocation of do-not-resuscitate (DNR) orders in the operating room?

What is meant by temporary revocation of do-not-resuscitate (DNR) orders in the operating room?

Prior to the early 1990s, it was generally felt that DNR orders were to be automatically revoked while a patient was in the operating room. The prevailing opinion was that surgery and anesthesia represented temporary alterations in the patient’s medical condition and, thus, interventions such as intubation and cardiopulmonary resuscitation should be able to be instituted without it being felt that one was violating a patient’s wishes to not be resuscitated. In 1993–1994, ethical guidelines for managing DNR patients undergoing anesthesia care were established by the American Society of Anesthesiologists.