A comparison of state and response entropy versus the bispectral index values during cesarean section

Kwon, Ji Sook; Kim, Dong Yeon; Chung, Rack Kyung; Kim, Chi Hyo; Lee, Hee Seung

Clinical Research

Obstetric Anesthesia

Anesthesia and Pain Medicine 2009;4(2):156-160.
Published online April 30, 2009.

A comparison of state and response entropy versus the bispectral index values during cesarean section

Ji Sook Kwon, Dong Yeon Kim, Rack Kyung Chung, Chi Hyo Kim, Hee Seung Lee

Department of Anesthesiology and Pain Medicine, Ewha Womans University School of Medicine, Seoul, Korea. kdyeon@ewha.ac.kr

Abstract

BACKGROUND
This study was designed to compare the measured values between the measured EEG-entropy and BIS monitor values during general anesthesia for cesarean section.
METHODS
Fourteen patients who were to undergo cesarean section were randomly selected for this study. After induction of anesthesia, desflurane was administered to achieve a steady-state end-tidal concentration of 3 vol%. The state entropy (SE), the response entropy (RE), the BIS and hemodynamic variables were collected at various time points.
RESULTS
During the induction period, the SE, RE and BIS values were slightly different. However, these indices were not significantly different during the maintenance period. The SE and RE values correlated with the BIS value during general anesthesia for cesarean section.
CONCLUSIONS
The changes in the SE and RE values followed a pattern that was similar to the BIS values during general anesthesia for cesarean section.

Key Words: bispectral index, cesarean section, desflurane, general anesthesia, response entropy, state entropy