Consistency Evaluation of the qCON, qNOX Indices and Bispectral Index

The first objective of this work is to compare the performances of three electroencephalogram based indices, the qCON index, the qNOX index and the bispectral index (BIS), in patients receiving gastrointestinal surgery during first postoperative night. Secondly, their behaviors under general anesthesia are also pointed out. The qCON and qNOX indices are implemented in an Angel 6000 monitor (WellHealth Medical Co Ltd., Shenzhen, China), and BIS indices are recorded in a BIS monitor (Aspect Medical Systems, Norwood, MA, USA). Data will be obtained from 30 patients scheduled for selective surgery undergoing general anesthesia with a combination of propofol, sufentanil and cis-atracurium in the first Hospital of China Medical University. The values of qCON, qNOX and BIS were statistically compared. The qCON, qNOX indices are recorded together with BIS during the whole operation period (Awake- Anesthesia-Recovery stages), as well as during the first night postoperatively (from 8:00pm to 06:00am). The values of qCON, qNOX and BIS were statistically compared. The Consistency evaluation will be conducted between qCON/qNOX and BIS.