Measurement of responsiveness of a subject with lowered level of consciousness
First Claim
1. A method for measuring the responsiveness of a subject with lowered level of consciousness, the method comprising the steps of:
- obtaining physiological signal data from a subject with lowered level of consciousness;
deriving, in a computer unit, a first measure from the physiological signal data, the first measure being indicative of the level of consciousness of the subject;
recording, in a computer unit, a sequence of the first measure; and
based on the sequence, determining, in a computer unit, a second measure indicative of a responsiveness of the subject,wherein the method is performed without inducing arousals in the subject.
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Abstract
The invention relates to a method and apparatus for measuring the responsiveness of a subject with lowered level of consciousness. Physiological signal data is obtained from the subject and a first measure indicative of the level of consciousness of the subject is derived from the physiological signal data. In order to obtain an objective measure of the responsiveness of the subject and to improve the specificity of patient monitoring, a sequence of the first measure is recorded without inducing arousals in the subject and a second measure indicative of a responsiveness of the subject is determined based on the recorded sequence. The determination of the second measure may be independent of the unintentional stimuli that cause arousals in the patient or the stimuli causing such arousals in the clinical environment may be detected to find out their effect on the first measure.
36 Citations
21 Claims
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1. A method for measuring the responsiveness of a subject with lowered level of consciousness, the method comprising the steps of:
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obtaining physiological signal data from a subject with lowered level of consciousness; deriving, in a computer unit, a first measure from the physiological signal data, the first measure being indicative of the level of consciousness of the subject; recording, in a computer unit, a sequence of the first measure; and based on the sequence, determining, in a computer unit, a second measure indicative of a responsiveness of the subject, wherein the method is performed without inducing arousals in the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification