Initiate at a conc of 0.5%. Surgical anaesth is usually produced in 7-10 min w/ conc of 1.5-3%. Maintenance
1-2.5% isoflurane in a 30% O2
/70% nitrous oxide mixture. Additional 0.5-1% isoflurane may be required w/ lower nitrous oxide levels, or given w/ O2
alone, or w/ air/O2
Reduce to 0.5% at the start of closing of operation wound, then to 0% at the end of surgery. Ventilate patient with O2
100% until complete recovery.