Case study encevis NeuroTrend 3h

In this three hours long recording, encevis detects several seizures, rhythmic and periodic patterns as well as burst suppression. The seizures repeat themselves and show the same picture of patterns every time. Several timepoints have been picked out for you to see the corresponding EEG.

encevis marks here the beginning of the seizure. You can see it marked  with the little triangle in the trace “SEIZURES”. encevis finds at this timepoint rhythmic theta activity. This can be seen as yellow lines in the traces “PATTERN LOCALIZATION” and "PATTERN FREQUENCY". Observe how these yellow lines go down with the time. The frequency is decreasing. The values of the frequency and average voltage can be seen when you move the mouse over the trace. In this case 5.7Hz and 28uV.

The rhythmic activity decreases in frequency, encevis detects then rhythmic delta activity that can be seen as purple lines in the traces "PATTERN". The trace "PATTERN FREQUENCY" as well as "FREQUENCY DISTRIBUTION" show that the EEG is slowing down. encevis seizure detection shows another marker as the seizure is continuing.

encevis still detects rhythmic delta activity shown as purple lines in the traces "PATTERN LOCALIZATION" and "PATTERN FREQUENCY". The rhythmic delta activity has lower frequency and lower amplitude at this timepoint, which can be also seen in the trace "AMPLITUDE-INTEGRATED EEG".

The seizure repeats itself every 15min and is detected by encevis. Patterns with similar frequencies are detected and you can notice a similar evolution every time. Here, encevis detected also RDA+S, rhythmic activity with superimposed spikes. Note in the 3h view above, that there are 10 such seizures.

In this part, no more seizures nor rhythmic patterns are detected. Instead you can see red lines and black dots in the trace "BURST SUPPRESSION" showing that burst suppressions were detected.

Find more detailed information about the methods behind the detection of of patterns in the publication "Automatic detection of rhythmic and periodic patterns in critical care EEG". The methods of the detection of burst suppression can be found in the publication "Monitoring burst suppression in critically ill patients: Multi-centric evaluation of a novel method". The detections follow the standard of the ACNS for critical care EEG.


By moving the mouse to the timepoint that interests you, you can go see the exact values of the calculated features. By using the mouse wheel you can easily zoom in and see the detections in more detail. You can quickly switch from 24 hours to seeing 5 min of results. Find more information in the tutorial videos.

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