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How much vapor is derived from 1 ml of a volatile anesthetic?

How much anesthetic is administered to an animal when a "small amount" is put on a cotton ball and placed near the animal's nose?
"The amount of volatile agent vapour deriving from 1 ml of fluid agent are for halothane 229 ml, isoflurane 195 ml, sevoflurane 184 m, and desflurane 210 ml."
Calculation of volatile anaesthetics consumption from agent concentration and fresh gas flow
 2014 Sep;58(8):968-72. doi: 10.1111/aas.12374. Epub 2014 Jul 24.





Delayed induction time

Using traditional methods of filling an induction chamber while connected to an in-house (active) scavenging system; it can take as long as 8 minutes for the top portion of an induction chamber to reach 3% isoflurane, resulting in a delayed and stressful induction.