期刊
ANESTHESIOLOGY
卷 109, 期 4, 页码 651-656出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/ALN.0b013e31818630ff
关键词
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资金
- Draper Foundation
- Wisconsin Alumni Research Foundation, Madison, Wisconsin
- National Science Foundation-Materials Research Science and Engineering Center
- University of Wisconsin - Madison [CHE 0518112]
- National Science Foundation, Arlington, Virginia [GM079375-01]
- National Institutes of Health, Bethesda, Maryland
- Department of Anesthesiology Research and Development Funds
- Betty J. Bamforth Research Professorship
- Wisconsin Alumni Research Foundation
Background: The intravenous delivery of halogenated volatile anesthetics has been previously achieved using phospholipid-stabilized emulsions, e.g., Intralipid. However, fluorinated volatile anesthetics, such as sevoflurane, are partially fluorophilic and do not mix well with classic nonfluorinated lipids. This effect limits the maximum amount of sevoflurane that can be stably emulsified in Intralipid. to 3.5% vol/vol. This is a significant limitation to the potential clinical use of intralipid-based emulsions. Methods: The authors prepared a 20% vol/vol sevoflurane emulsion using a novel fluorinated surfactant and tested its effectiveness and therapeutic index by administering it to male Sprague-Dawley rats via intravenous injection into the jugular vein. The median effective dose to induce anesthesia (ED50), the median lethal dose (LD50), and the therapeutic index (LD50/ED50) were determined. Anesthesia was measured by loss of the forepaw righting reflex. Results: The ED50 and LD50 values were found to be 0.41 and 1.05 ml emulsion/kg body weight, respectively. These lead to a therapeutic index of 2.6, which compares favorably with previously determined values of emulsified isoflurane, as well as values for propofol and thiopental. Conclusions: A novel semifluorinated surfactant was able to considerably increase the maximum amount of stably emulsified sevoflurane compared with intralipid. These formulations can be used to rapidly induce anesthesia with bolus dosing from which recovery is smooth and rapid.
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