Development of BDR and BTR on depth of anesthesia using power spectrum density analysis

In this paper, new parameters were developed to estimate the depth of anesthesia during a general anesthesia using EEG. Power spectral density(PSD) analysis was used for these parameters because EEG became slow wave during anesthesia. The new parameters were DTR, ATR, TDR, ADR, BTR and BDR applied to PSD. These parameters were compared with SEF which is conventionally used at clinic and confirmed clinical value. As the results, DTR, ATR, TDR, ADR among parameters were not useful compared with SEF but BTR and BDR is valuable for clinic. For 10 patents, at pre-operation BDR the value is 265.36 +/- 25.29, at induction the value is 129.23 +/- 34.92, at operation the value is 154.99 +/- 38.34, at awaked the value is 283.83 +/- 39.80 and at post-operation the value is 234.80 +/- 23.46. Also at pre-operation BTR value is 183.38 +/- 13.59, at induction the value is 104.09 +/- 25.11, at operation the value is 115.38 +/- 23.42, at awaked the value is 190.33 +/- 23.31 and at post-operation the value is 172.38 +/- 19.08. Trend of BDR and BTR is similar to change of SEF, so two parameters are useful to estimate the depth of anesthesia.