RECOVERY OF ISOFLURANE DURING INHALATION ANESTHESIA BY SELECTIVE ADSORPTION FROM THE SCAVENGED GAS

The adsorption of scavenged isoflurane by selective adsorption was mea sured in 14 patients during inhalation anaesthesia using a higher now regime for the maintenance. Application of a special porous material a llowed the complete selective adsorption of isoflurane from the outlet port of the scavenging system of the anaesthesia machine. In comparis on to charcoal filters the use of the porous material allowed a revers ible process achieving almost complete desorption at temperatures not higher than 160 degrees C. The desorption is followed by condensation of isoflurane at 2-8 degrees C. About 60% of the delivered isoflurane was recovered by adsorption. Condensed isoflurane regained is of high purity according to gaschromatographic analyses.