EEG Changes During Induction of Propofol Anesthesia

Study Overview
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Brief Summary
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PropoStatus is a prospective observational study investigating the EEG changes seen in neurologically healthy patients during induction of general anesthesia with propofol.

Detailed Description
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PropoStatus is a prospective observational study investigating the EEG changes seen in neurologically healthy patients during induction of general anesthesia with propofol. EEG changes are investigated in different levels of anesthesia from awake state to deep anesthesia in which burst suppression pattern (BSP) is seen in the EEG. Furthermore, the relation of EEG changes and clinically evaluated depth of anesthesia is studied. The study population is comprised of neurologically healthy individuals who come to the hospital for elective surgery requiring general anesthesia. The patients will not receive any pre-medication. They will give a written consent to participate to the study. During induction of anesthesia, the vital signs will be monitored using the standard protocol of the operating room. EEG will be recorded using a wireless measurement device. The EEG is observed during the recording from a laptop or tablet computer. The anesthesia is induced using propofol with a fixed infusion rate of 30 mg/kg/h. The patient is asked to squeeze the anesthetist's hand repeatedly every 10 s. The moment at which the patients does not respond to the command anymore is considered as the loss of consciousness. The infusion is continued until BSP is observed in the EEG. The infusion is then continued for 3 min after which the recording of EEG is stopped. The administration of anesthesia is then continued as required by the operation. The EEG recording will be carried out using two different devices. The first dataset, including 20 patients, will be collected using Bittium BrainStatus EEG electrode and device. The second dataset, including 30 patients, will be collected using Nihon Kohden CerebAir device.

Official Title
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Assessment of EEG Changes During Induction of Propofol Anesthesia Using Wireless Measurement Devices

Conditions
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Anesthesia, General, Healthy Subjects

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: ASA 1-2 (no neurological or cardiovascular diseases) Exclusion Criteria BMI > 30

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| EEG slow-wave activity | EEG slow-wave activity is defined by the low-frequency (<1 Hz) signal power. The study investigates the topographic distribution of the activity as well as the coupling of the activity between the electrodes. The relation of slow-wave activity and loss of consciousness will be investigated as well. | Induction of anesthesia (approx. 10-30 min) | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| EEG activity on other frequency bands | In addition to slow wave activity, the study investigates the topographic distribution of the activities on other frequency bands (delta, theta, alpha, beta) as well as the coupling of these activities between the electrodes.The relation of these other activities and loss of consciousness will be investigated as well. | Induction of anesthesia (approx. 10-30 min) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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EEG, Propofol