Guedel’s signs /go̅o̅′dəlz/ [Arthur E. Guedel, American anesthesiologist, 1883–1956] , a system for describing the stages and planes of anesthesia based on physical signs observed in the patient. These stages are most applicable to inhalation anesthesia and are difficult to delineate when combination or modern anesthetics are given. See also anesthesia.
