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| 1914 || Literature || The ''American Journal of Surgery'' begins publication of the ''Quarterly Supplement of Anesthesia and Analgesia'', which would endure until 1926.<ref name="The History of Professionalism in Anesthesiology"/> || {{w|United States}}
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| 1914 || Field development || "Dr. Dennis E. Jackson develops a carbon dioxide (CO2) absorbing anesthesia system, allowing for a patient to re-breathe their exhaled air containing the anesthetic, cleansed of the carbon dioxide, resulting in the use of less anesthetic and the avoidance of waste. Ten years later, Dr. Ralph Waters develops the first simple and easily transportable absorber, known as the "Waters Canister" and the "Waters To-and-Fro.""<ref name="History of Anesthesia"/> ||
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| 1916 || Literature || Paluel J. Flagg publishes ''The Art of Anaesthesia''.<ref>{{cite book |last1=Flagg |first1=Paluel Joseph |title=The Art of Anaesthesia |url=https://books.google.com.ar/books/about/The_Art_of_Anaesthesia.html?id=j0CM1rnp93MC&redir_esc=y}}</ref> ||
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| 1917 || Field development || British anesthetist {{w|Henry Edmund Gaskin Boyle}} first describes the {{w|anaesthetic machine}} (also known as Boyle's machine).<ref name="History of anaesthesia"/> || {{w|United Kingdom}}
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| 1920 || Field development || "Arthur Guedel publishes his eye signs first describes four stages of general anesthesia as induced by ether anesthesia in the American Journal of Surgeryhumans. His stages can be loosely applied to anesthesia produced by inhalants other than ether and injectables.<ref>{{cite book |last1=Hameroff |first1=S.R. |title=Ultimate Computing: Biomolecular Consciousness and NanoTechnology |url=https://books.google.com.ar/books?id=-uC54_DD0tMC&pg=PA188&dq=%22in+1920%22+%22Arthur+Guedel (oral) airway is still used today, %22&hl=en&sa=X&ved=0ahUKEwi9jMOEirzdAhXLHJAKHQfuDOgQ6AEILTAB#v=onepage&q=%22in%201920%22%20%22Arthur%20Guedel%22&f=false}}</ref><ref>{{cite book |title=Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society |edition=IEEE Engineering in Medicine and he has been memorialized by the Arthur EBiology Society. Conference |url=https://books.google.com. ar/books?id=6vRVAAAAMAAJ&q=%22in+1920%22+%22Arthur+Guedel%22&dq=%22in+1920%22+%22Arthur+Guedel Memorial %22&hl=en&sa=X&ved=0ahUKEwi9jMOEirzdAhXLHJAKHQfuDOgQ6AEIQzAF}}</ref><ref>{{cite book |title=Anesthesia Centerand Analgesia in Laboratory Animals |edition=Dennis F. Kohn, Sally K. Wixson, San FranciscoWilliam J. White, CAG. John Benson |url=https://books.google."com.ar/books?id=xJWCnuy2kE4C&pg=PR15&dq=%22in+1920%22+%22Arthur+Guedel%22&hl=en&sa=X&ved=0ahUKEwi9jMOEirzdAhXLHJAKHQfuDOgQ6AEIKDAA#v=onepage&q=%22in%201920%22%20%22Arthur%20Guedel%22&f=false}}</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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| 1923 || Field development || The first ethylene-oxygen surgical anesthetic is administered by Dr. Isabella Herb, who demonstrates the remarkable trance-like state that low-dose ethylene can induce in human subjects.<ref name="History of Anesthesia"/> ||
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| 1924 || || Dr. Ralph Waters develops the first simple and easily transportable absorber, known as the "Waters Canister" and the "Waters To-and-Fro."<ref name="History of Anesthesia"/> ||
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| 1930 || Field development || Brian Sword introduces the circle absorption system.<ref name="History of Anesthesia"/> ||
