scholarly journals Burst suppression ratio is the only determinant for BIS values below 30

2002 ◽  
Vol 49 (7) ◽  
pp. 755-756 ◽  
Author(s):  
Jörgen Bruhn
Keyword(s):  
Suppression Ratio ◽  
Burst Suppression

Burst-Suppression Ratio on Electrocorticography Depends on Interelectrode Distance

2016 ◽  
Vol 33 (2) ◽  
pp. 127-132 ◽  
Author(s):  
Mihai Moldovan ◽  
Alexandru Calin ◽  
Vishakhadatta M. Kumaraswamy ◽  
Diana Braver ◽  
Mirela V. Simon
Keyword(s):  
Suppression Ratio ◽  
Burst Suppression ◽  
Interelectrode Distance

Elevated Burst Suppression Ratio: The Possible Role of Hypoxemia

2006 ◽  
Vol 103 (6) ◽  
pp. 1609-1610 ◽  
Author(s):  
Ngai Liu ◽  
Thierry Chazot ◽  
Catherine Mutter ◽  
Marc Fischler
Keyword(s):  
Suppression Ratio ◽  
Burst Suppression

An effective correlation dimension and burst suppression ratio of the EEG in rat. Correlation with sevoflurane induced anaesthetic depth

2006 ◽  
Vol 23 (5) ◽  
pp. 391-402 ◽  
Author(s):  
P. L. C. van den Broek ◽  
C. M. van Rijn ◽  
J. van Egmond ◽  
A. M. L. Coenen ◽  
L. H. D. J. Booij
Keyword(s):  
Suppression Ratio ◽  
Correlation Dimension ◽  
Burst Suppression ◽  
Anaesthetic Depth

scholarly journals Plasma propofol concentration and EEG burst suppression ratio during normothermic cardiopulmonary bypass †

2003 ◽  
Vol 90 (2) ◽  
pp. 122-126 ◽  
Author(s):  
K. Yoshitani ◽  
M. Kawaguchi ◽  
M. Takahashi ◽  
K. Kitaguchi ◽  
H. Furuya
Keyword(s):  
Cardiopulmonary Bypass ◽  
Suppression Ratio ◽  
Burst Suppression

Electroencephalogram Approximate Entropy Correctly Classifies the Occurrence of Burst Suppression Pattern as Increasing Anesthetic Drug Effect

2000 ◽  
Vol 93 (4) ◽  
pp. 981-985 ◽  
Author(s):  
Jörgen Bruhn ◽  
Heiko Röpcke ◽  
Benno Rehberg ◽  
Thomas Bouillon ◽  
Andreas Hoeft
Keyword(s):  
Suppression Ratio ◽  
Drug Effect ◽  
Pearson Correlation ◽  
Approximate Entropy ◽  
Burst Suppression ◽  
Major Surgery ◽  
Median Frequency ◽  
Anesthetic Drug ◽  
Spectral Edge Frequency ◽  
Spectral Edge

Background Approximate entropy, a measure of signal complexity and regularity, quantifies electroencephalogram changes during anesthesia. With increasing doses of anesthetics, burst-suppression patterns occur. Because of the high-frequency bursts, spectrally based parameters such as median electroencephalogram frequency and spectral edge frequency 95 do not decrease, incorrectly suggesting lightening of anesthesia. The authors investigated whether the approximate entropy algorithm correctly classifies the occurrence of burst suppression as deepening of anesthesia. Methods Eleven female patients scheduled for elective major surgery were studied. After propofol induction, anesthesia was maintained with isoflurane only. Before surgery, the end-tidal isoflurane concentration was varied between 0.6 and 1.3 minimum alveolar concentration. The raw electroencephalogram was continuously recorded and sampled at 128 Hz. Approximate entropy, electroencephalogram median frequency, spectral edge frequency 95, burst-suppression ratio, and burst-compensated spectral edge frequency 95 were calculated offline from 8-s epochs. The relation between burst-suppression ratio and approximate entropy, electroencephalogram median frequency, spectral edge frequency 95, and burst-compensated spectral edge frequency 95 was analyzed using Pearson correlation coefficient. Results Higher isoflurane concentrations were associated with higher burst-suppression ratios. Electroencephalogram median frequency (r = 0.34) and spectral edge frequency 95 (r = 0.29) increased, approximate entropy (r = -0.94) and burst-compensated spectral edge frequency 95 (r = -0.88) decreased with increasing burst-suppression ratio. Conclusion Electroencephalogram approximate entropy, but not electroencephalogram median frequency or spectral edge frequency 95 without burst compensation, correctly classifies the occurrence of burst-suppression pattern as increasing anesthetic drug effect.

EEG Approximate Entropy as a Measure of Anesthetic Effect: Capabilities for Online-Application and Correlation with Burst Suppression Ratio

2002 ◽  
Vol 96 (Sup 2) ◽  
pp. A539
Author(s):  
Oliver Dressler ◽  
Gerhard Schneider ◽  
Karl Naguib ◽  
Gudrun Stockmanns ◽  
Eberhard F. Kochs
Keyword(s):  
Suppression Ratio ◽  
Approximate Entropy ◽  
Burst Suppression ◽  
Online Application ◽  
Anesthetic Effect

scholarly journals Remifentanil Alleviates Propofol-Induced Burst Suppression without Affecting Bispectral Index in Female Patients: A Randomized Controlled Trial

2019 ◽  
Vol 8 (8) ◽  
pp. 1186
Author(s):  
Dahye Jung ◽  
Sungwon Yang ◽  
Min Soo Lee ◽  
Yoonki Lee
Keyword(s):  
Bispectral Index ◽  
Suppression Ratio ◽  
Controlled Trial ◽  
Burst Suppression ◽  
Remifentanil Infusion ◽  
Female Patients ◽  
Effect Site ◽  
Effect Site Concentration ◽  
American Society ◽  
American Society Of Anesthesiologists

The bispectral index is affected by various factors, such as noxious stimuli and other drugs, such as muscle relaxants. The burst suppression ratio from bispectral index monitoring is correlated with electroencephalographic burst suppression, which is associated with deep anesthesia, metabolic disorders, and brain injury. We assessed patients undergoing total intravenous anesthesia and examined the effects of remifentanil on the bispectral index, burst suppression ratio, and hemodynamic changes immediately after loss of consciousness with propofol. Seventy American Society of Anesthesiologists physical status class I and II Korean female patients scheduled for general anesthesia were administered propofol with an effect-site concentration of 5 μg/mL, using a target-controlled infusion (TCI). After losing consciousness, patients received either saline or remifentanil at an effect-site concentration of 5 ng/mL for 10 min. During this period, we recorded the bispectral index values, including burst suppression ratio, blood pressure, and heart rate. With remifentanil infusion, burst suppression ratios were lower (p < 0.01) but bispectral values were not different. The burst suppression ratio was significantly different at 6, 7, 8, and 10 min after remifentanil infusion (p < 0.05). In female patients with propofol-induced unconsciousness, remifentanil alleviated the burst suppression ratio without affecting the bispectral value.

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