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| 1920 || || "Arthur Guedel publishes his eye signs of ether anesthesia in the American Journal of Surgery. His Guedel (oral) airway is still used today, and he has been memorialized by the Arthur E. Guedel Memorial Anesthesia Center, San Francisco, CA."<ref name="History of Anesthesia"/> ||
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| 1920 || Field development || British anesthetist {{w|Ivan Magill}} and Stanley Rowbotham develop endotracheal anesthesia.<ref name="History of anaesthesia"/> || {{w|United Kingdom}}
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| 1922 || Literature || "From Cleveland, Ohio, ''Current Researches in Anesthesia and Analgesia '' is launched in {{w|Cleveland}} by Francis H. "Frank" McMechan (1879-1939) as the world's first journal published by an anesthesia society, the International Anesthesia Research Society." <ref name="History of Anesthesia"/> ||{{w|United States}}
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| 1923 || Field development || "Dr. Isabella Herb administers the The first ethylene-oxygen surgical anestheticis administered by Dr. She demonstrated Isabella Herb, who demonstrates the remarkable trance-like state that low-dose ethylene could can induce in human subjects."<ref name="History of Anesthesia"/> ||
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| 1930 || Field development || Brian Sword introduces the circle absorption system.<ref name="History of Anesthesia"/> ||
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| 1932 || Organization || The Association of anaesthetists of Great Britain and Ireland is formed.<ref name="History of anaesthesia"/> || {{w|United Kingdom}}, {{w|Ireland}}
