Edmond I Eger II

Edmond ‘Ted’ Eger II (1930 – 2017)

Edmond ‘Ted’ Eger II (1930-2017) was an American anesthesiologist.

Eger developed the concept of minimum alveolar concentration (MAC) for gaseous and volatile anesthetic agents as a means of comparing their potencies. 

Defined MAC as the ‘minimal alveolar concentration of anesthetic at 1 atmosphere that produces immobility in 50 per cent of those patients or animals exposed to a noxious stimulus’. In later years, he identified the processes governing the onset, uptake and distribution of inhaled anesthetics into tissues and how quickly they are removed at the end of anesthesia.

He developed these concepts and used them for early human pharmacological studies of drugs, such as isoflurane, sevoflurane and desflurane.

  • Born on September 3, 1930 at Chicago, USA; his parents gave him a middle initial but not a middle name…There were three ‘Eds’ in the house, so he became ‘Ted’
  • 1951 – Bachelor of Science degree from the Roosevelt University in Chicago
  • 1955 – MD degree from Northwestern University Medical School, Chicago
  • 1958-1960 Chief of the Anesthesia and Operative section at the US Army Hospital in Fort Leavenworth, Kansas
  • 1960 – University of California, San Francisco
  • 1965 – Introduced the concept of minimum alveolar concentration (MAC) 
  • 1989 – Awarded the ASA Award for Excellence in Research
  • 1991 – Received the Distinguished Service Award of the American Society of Anesthesiologists 
  • Died on August 26, 2017 from pancreatic cancer

Medical Eponyms
Minimal alveolar concentration (MAC)

Major Publications



Eponymous terms


the person behind the name

BA MA (Oxon) MBChB (Edin) FACEM FFSEM. Emergency physician, Sir Charles Gairdner Hospital.  Passion for rugby; medical history; medical education; and asynchronous learning #FOAMed evangelist. Co-founder and CTO of Life in the Fast lane | Eponyms | Books | Twitter |

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