Fluoropolymer-based emulsions for the intravenous delivery of sevoflurane.
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.
Fast
Jonathan P
JP
Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA.
Perkins
Mark G
MG
Pearce
Robert A
RA
Mecozzi
Sandro
S
D018686:Anesthetics, Intravenous / Q000008:administration & dosage*; D000818:Animals; D004655:Emulsions; D005217:Fat Emulsions, Intravenous / Q000008:administration & dosage; D005466:Fluorocarbons / Q000008:administration & dosage; D007275:Injections, Intravenous; D007928:Lethal Dose 50; D008297:Male; D008738:Methyl Ethers / Q000008:administration & dosage*; D051381:Rats; D017207:Rats, Sprague-Dawley; D000077149:Sevoflurane
D018686:Anesthetics, Intravenous; D004655:Emulsions; D005217:Fat Emulsions, Intravenous; D005466:Fluorocarbons; D008738:Methyl Ethers; D000077149:Sevoflurane