Burst suppression monitor for induced coma
First Claim
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1. A method in a monitoring system of monitoring a sedated subject using a logic processor, the method comprising:
- receiving digital data representing said subject'"'"'s EEG signal at said processor;
calculating an absolute amplitude difference (di) in microvolts continuously across said EEG signal;
using said processor to determine one or more burst onsets;
using said processor to determine one or more suppression onsets;
using said processor to determine one or more interburst or burst suppression intervals by comparing one or more burst onsets to one or more previous suppression onsets;
using said processor to determine a mean burst suppression interval for a specified time length wherein said mean burst suppression interval indicates time between a burst onset and the previous suppression onset, regardless of burst duration;
using said mean burst suppression interval to inform therapy for said subject to maintain said desired state of sedation;
wherein said determination of said one or more burst onsets comprises detecting when an absolute amplitude difference (di) exceeds 2 times a median (m) absolute amplitude of the EEG over a running history of 2 or more interburst intervals.
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Abstract
Methods and systems for monitoring subjects, analyzing EEG data, and maintaining subjects at desired sedation states using automatic processing systems to determine a mean burst suppression interval for a specified time length and using that interval to inform monitoring or administration of sedation.
25 Citations
25 Claims
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1. A method in a monitoring system of monitoring a sedated subject using a logic processor, the method comprising:
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receiving digital data representing said subject'"'"'s EEG signal at said processor; calculating an absolute amplitude difference (di) in microvolts continuously across said EEG signal; using said processor to determine one or more burst onsets; using said processor to determine one or more suppression onsets; using said processor to determine one or more interburst or burst suppression intervals by comparing one or more burst onsets to one or more previous suppression onsets; using said processor to determine a mean burst suppression interval for a specified time length wherein said mean burst suppression interval indicates time between a burst onset and the previous suppression onset, regardless of burst duration; using said mean burst suppression interval to inform therapy for said subject to maintain said desired state of sedation; wherein said determination of said one or more burst onsets comprises detecting when an absolute amplitude difference (di) exceeds 2 times a median (m) absolute amplitude of the EEG over a running history of 2 or more interburst intervals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 16, 17, 19)
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14. A method in a monitoring system of monitoring a sedated subject using a logic processor, the method comprising:
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receiving digital data representing said subject'"'"'s EEG signal at said processor; using said processor to determine one or more burst onsets; using said processor to determine one or more suppression onsets; using said processor to determine one or more interburst or burst suppression intervals by comparing one or more burst onsets to one or more previous suppression onsets; using said processor to determine a mean burst suppression interval for a specified time length wherein said mean burst suppression interval indicates time between a burst onset and the previous suppression onset, regardless of burst duration; wherein said determination of burst onsets comprises; calculating absolute amplitude difference (di)) in microvolts continuously across said EEG signal; using smoothing to minimizes effects of signal variation on onset detection to determine a smoothed amplitude difference; and detecting burst onset when an absolute smoothed amplitude difference exceeds B times a median (m) absolute amplitude of the EEG over a running history of 2 or more interburst intervals; and wherein B is chosen theoretically or empirically. - View Dependent Claims (15, 18, 20, 21, 22, 23, 24, 25)
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Specification