Comparative Analysis of Phase Lag Entropy (PLE) and Bispectral Index (BIS) as an Anesthetic Depth Indicator

Comparative Analysis of Phase Lag Entropy (PLE) and Bispectral Index (BIS) as an Anesthetic Depth Indicator in Patients Undergoing Otopharyngeal Surgery With Facial Nerve Integrity Monitoring

The aim of this comparative analysis is to evaluate the reliability of PLE value as an anesthetic depth indicator

1. To evaluate the reliability of PLE value as an anesthetic depth indicator, the investigators compare PLE value with BIS score during induction and emergence of general anesthesia using propofol target controlled infusion.
2. In addition, the investigators verify whether or not the facial nerve integrity monitoring affects the efficacy for PLE and BIS values as an anesthetic depth indicator.

Inclusion Criteria:

• Patients who scheduled for otopharyngeal surgery under facial nerve integrity monitoring requiring general anesthesia and American Society of Anesthesiology (ASA) physical status 1 or 2

Exclusion Criteria:

• Patient who has been taken anticonvulsant agents, sedatives, and hypnotics
• Patient who has central nerve system disease, neurological disorder
• Patient with hypersensitivity to anesthetics