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Comparison of Two Electroencephalogram (EEG)-Derived Indices With Electroencephalogram Signals

This study has been completed.
Tampere University Hospital
Information provided by (Responsible Party):
Arvi Yli-Hankala, Tampere University Hospital Identifier:
First received: February 26, 2010
Last updated: October 8, 2013
Last verified: October 2013
Bispectral Index (BIS) and Entropy indices will be compared with each other, and to raw EEG signals in patients receiving sevoflurane anaesthesia. BIS and Entropy numbers often differ significantly from each other during surgery, and the reason for this has not been studied in detail, therefore remaining only poorly understood. BIS and Entropy, together with multi-channel EEG, will be collected and analyzed later on. Course of anaesthesia and surgery will be annotated. All relevant information from anaesthesia monitor will be collected on computer.


Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Comparison of Bispectral Index and Entropy With Electroencephalogram During Sevoflurane Anaesthesia

Resource links provided by NLM:

Further study details as provided by Tampere University Hospital:

Primary Outcome Measures:
  • Morphology of electroencephalogram during discrepancy between Entropy and BIS index values [ Time Frame: 15 minutes ]

Enrollment: 65
Study Start Date: December 2009
Study Completion Date: March 2011
Primary Completion Date: March 2011 (Final data collection date for primary outcome measure)
Entropy - BIS
Patients undergoing surgery in sevoflurane anaesthesia.


Ages Eligible for Study:   50 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population
Middle aged and elderly surgical patients

Inclusion Criteria:

  • Planned surgery necessitating general anaesthesia
  • Expected duration of anaesthesia 30 min or more
  • Need of endotracheal intubation
  • ASA status 1, 2 or 3

Exclusion Criteria:

  • Significant disorders of the autonomic or central nervous system
  • Family history of malignant hyperthermia
  • Clinical history of anaphylactic reaction against inhaled anaesthetics
  • Disability to communicate with Finnish language
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Please refer to this study by its identifier: NCT01077674

Tampere University Hospital
Tampere, Finland, 33521
Sponsors and Collaborators
Arvi Yli-Hankala
Tampere University Hospital
Study Chair: Arvi Yli-Hankala, MD Tampere University Hospital
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Arvi Yli-Hankala, Professor, Tampere University Hospital Identifier: NCT01077674     History of Changes
Other Study ID Numbers: Kotoe_03
Study First Received: February 26, 2010
Last Updated: October 8, 2013

Keywords provided by Tampere University Hospital:

Additional relevant MeSH terms:
Platelet Aggregation Inhibitors
Anesthetics, Inhalation
Anesthetics, General
Central Nervous System Depressants
Physiological Effects of Drugs processed this record on April 28, 2017