1. A history of the discovery of the application of nitrous oxide gas, ether, and other vapors, to surgical operations;Wells,1847
2. Cambridge sketches;Stearns,1905
3. The latest ASA mandate: CO2 monitoring for moderate and deep sedation;Weaver;Anesth Prog,2011
4. American Society of Anesthesiologists. Continuum of depth of sedation: definition of general anesthesia and levels of sedation/analgesia (approved by the ASA House of Delegates on October 13, 1999, and last amended on October 15, 2014).
5. Conscious sedation procedures using intravenous midazolam for dental care in patients with different cognitive profiles: a prospective study of effectiveness and safety;Collado;PLoS One,2013