Global Warming Impact of Nitrous Oxide

In conventional nitrous oxide carrier group 2% Sevoflurane in O2-N2O (60 % FiO2) @3L/min will be delivered to achieve MAC 0.5.

In streamed-in nitrous oxide carrier group 2% Sevoflurane in O2 -Air (60 % FiO2) will be delivered @3.0L/min to achieve a MAC of 0.5. Then, the FGF will be decreased to 1.0 L (low flow) and N2O will be 'streamed-in' @ 40 %.

Ventilation will be initiated with 2% sevoflurane in all the groups