A Preparative Study on the Continous Changing of the Clinical Sedative Signs in the Dental Treatment Patient with the Inhalation Sedation of Nitrous Oxides Gas

Index of Changing of EEG, EOG, EMG, RC

Abstract

The purpose of this study is to suggest the examination of a method of the changing quantitative analysis which the polygraph indicates for the dental treatment of patients with inhalation sedation of nitrous oxides gas. We selected 8persons who were healthy adult men from 20 to 24 years of age. The process of sedation with nitrous oxide gas which we used was at first the inhalation of pressure air with face mask with a capacity 8 litter per minute for 4 minutes, then, changed that air to 30% N₂O and 70% O₂.
The outputs of the polygraph were the electroencephalograph at front head, the horizontal electrooculograph, the electromyograph on the muscles mentalis and the respiration rate.
We transmitted these outputs from the dental chair. We calculated these outputs with the computer immediately, and analysised for one minute the power rate for the electroencephalograph with each cycle, the frequency of the electrooculograph, the integrate rate for the electromyograph.
The result showed a contrasting rate for the inhaltation with pressurized air for one minute:
1) The power rates significant decreased on the θ wave and α wave within 9minutes after starting the inhaltation with nitrous oxide gas, and then, β wave increased significant. These two changes was brief.
2) The frequency of electrooculograph significant decrease between 3 minutes and 9 minutes after the inhaltation with nitrous oxide gas.
3) The integrate rate did not show significant change, but had an inclination to be stable after 10 minutes after the inhaltation.
4) The respiration rate was stabilized with the inhaltation with nitrous oxide gas.