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Sevoflurane



Sevoflurane
Systematic (IUPAC) name
1,1,1,3,3,3-hexafluoro-2-(fluoromethoxy)propane
Identifiers
CAS number 28523-86-6
ATC code N01AB08
PubChem 5206
DrugBank APRD00219
Chemical data
Formula C4H3F7O 
Mol. mass 200.055 g/mol
Pharmacokinetic data
Bioavailability  ?
Metabolism  ?
Half life  ?
Excretion  ?
Therapeutic considerations
Pregnancy cat.

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Legal status
Routes  ?

Sevoflurane (2,2,2-trifluoro-1-[trifluoromethyl]ethyl fluoromethyl ether), also called fluoromethyl hexafluoroisopropyl ether, is a sweet-smelling, non-flammable, highly fluorinated methyl isopropyl ether used for induction and maintenance of general anesthesia. Together with desflurane, it is replacing isoflurane and halothane in modern anesthesiology. It is often administered in a mixture of nitrous oxide and oxygen. After desflurane it is the volatile anesthetic with the fastest onset and offset. Though desflurane has the lowest blood/gas coefficient of the currently used volatile anesthetics, sevoflurane is the preferred agent for mask induction due to its lesser irritation to mucous membranes.

Additional recommended knowledge

Though it vaporizes readily, it is a liquid at room temperature and is administered via an anesthetic vaporizer attached to an anesthetic machine.

It was introduced into clinical practice initially in Japan in 1990.

Sevoflurane forms at least two degradation products, Compound A [fluoromethyl-2,2-difluoro-1-(trifluoromethyl)vinyl ether] and Compound B [1,1,1,3,3-pentafluoro-2-(fluoromethoxy)-3-methoxypropane], on contact with the soda lime in a rebreathing apparatus, which absorbs exhaled carbon dioxide, especially at higher temperatures and when the soda lime is desiccated. Compound A has been shown to cause renal necrosis in rats. In humans, direct histological evidence of renal toxicity has not been demonstrated, although there is dose-related proteinuria, glycosuria and enzymuria. During low-flow anaesthesia, when the lower fresh gas flow leads to decreased flushing of the circuit and increased temperature of the soda lime, Compound A may build up to clinically significant levels. As a result, sevoflurane is sometimes administered with a minimum fresh gas flow of 2 liters per minute, making it a relatively expensive choice for maintaining general anesthesia.

Physical properties

Boiling point: 58.6 °C (at 101.325 kPa)
Density: 1.517–1.522 g/cm³ (at 20 °C)
MAC : 2 vol %
Molecular Weight: 200 u
Vapor pressure: 157 mmHg (20.9 kPa) (at 20 °C)
197 mmHg (26.3 kPa) (at 25 °C)
317 mmHg (42.3 kPa) (at 36 °C)
Blood:Gas Partition Coefficient: 0.68
Oil:Gas Partition Coefficient: 47

http://www.priory.com/anaesthesia/propofol_and_sevoflurane.htm

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sevoflurane". A list of authors is available in Wikipedia.
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