Bispectral Index and Clinical Parameters Evaluation in Dental Procedures

The N2O/O2 equipment was composed by two flow meters with an anti-hypoxia system valve, 70% N2O maximum disposal and 30 L/min O2 valve to immediate oxygen dispensation. Masks were individually selected, being 100% O2 (6 L/min) dispensed until respiratory rate stabilization. N2O was incremented at 10% each 2 minutes (70% max, if necessary) until some of the following signals were noticed: silence, relax/comfort report, decreased eyelid movements, decreased spontaneous body movements, warm sensation, tingling sensation or numbness at feet, hands or oral region, and slightly euphoric sensation.