Monitoring of the cerebral state of a subject
First Claim
1. A method for monitoring the cerebral state of a subject, the method comprising the steps of:
- obtaining physiological signal data from a subject, the physiological signal data including EEG signal components;
supplying the physiological signal data to a monitoring process operating on a computer unit and configured to derive a state index from the physiological signal data, the state index being indicative of the cerebral state of the subject;
determining in the computer unit whether a drug is being administered to the subject that induces high frequency EEG signal components; and
modifying the operation of the monitoring process in the computer unit when the determining step determines at least one drug inducing high frequency EEG signal components is being administered to the subject.
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Accused Products
Abstract
The invention relates to a method and apparatus for monitoring the anesthetic state of a subject. Physiological signal data including EEG and possibly also EMG signal components is acquired from a subject and supplied to a monitoring process configured to derive, based on the said data, a state index indicative of the anesthetic state of the subject. In order to extend the applicability of present-day monitoring processes, the operation of the monitoring process is controlled according to whether at least one drug inducing high frequency EEG signal components is administered to the subject. The presence of the high frequency EEG signal components in the physiological signal data may be detected automatically.
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Citations
16 Claims
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1. A method for monitoring the cerebral state of a subject, the method comprising the steps of:
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obtaining physiological signal data from a subject, the physiological signal data including EEG signal components; supplying the physiological signal data to a monitoring process operating on a computer unit and configured to derive a state index from the physiological signal data, the state index being indicative of the cerebral state of the subject; determining in the computer unit whether a drug is being administered to the subject that induces high frequency EEG signal components; and modifying the operation of the monitoring process in the computer unit when the determining step determines at least one drug inducing high frequency EEG signal components is being administered to the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus for monitoring the cerebral state of a subject, the apparatus comprising:
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a measurement device positioned on a subject to obtain physiological signal data from the subject, the physiological signal data including EEG signal components; a monitoring device for deriving a state index from the physiological signal data, the state index being indicative of the cerebral state of the subject; and a computer unit for determining whether a drug is being administered to the patient that induces high frequency EEG signal components, wherein the computer unit modifies the operation of the monitoring device according to whether at least one drug inducing high frequency EEG signal components is administered to the subject. - View Dependent Claims (11, 12, 13)
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14. A computer program product, embodied on a computer readable medium, for monitoring the cerebral state of a subject, the computer program product comprising:
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a first program code portion configured to receive a control instruction for controlling the operation of a monitoring process adapted to derive a state index indicative of the cerebral state of the subject; a second program code portion configured to control the operation of the monitoring process in response to the control instruction; and a third program code portion configured to determine whether a drug inducing high frequency EEG signal components is being administered to the subject, wherein the second program code modifies the operation of the monitoring process upon detection of high frequency EEG signal components in the physiological data.
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15. A method for monitoring the cerebral state of a subject, the method comprising the steps of:
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obtaining physiological signal data from a subject, the physiological signal data including EEG signal components; supplying the physiological signal data to a monitoring process operating on a computer unit and configured to derive a state index from the physiological signal data, the state index being indicative of the cerebral state of the subject; monitoring whether high frequency EEG signal components are substantially present in the physiological signal data, the monitoring step comprising the sub-steps of; calculating, based on the physiological signal data, signal power values on a first frequency band covering both EEG and EMG frequencies and on a second frequency band covering only EMG frequencies; calculating a ratio of the calculated signal power in the first frequency band and the second frequency band; and comparing the ratio with a predetermined threshold value to detect whether the high frequency EEG signal components are substantially present in the physiological signal data; and modifying the operation of the monitoring process in the computer unit upon detecting that the high frequency EEG signal components are substantially present in the physiological signal data. - View Dependent Claims (16)
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Specification