23 Event Surveillance
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Event Episodes
When an event occurs, information for a predefined duration is stored. This is the event episode. It
includes information from a defined period before the trigger, called the event pre-time. The episode
time after the event is called the event post-time. If a further event occurs during the event post-time it
changes a single event to a combined event (combi-event).
Manually-triggered event episodes document patient information from the time leading up to the event
trigger; they do not have a post-time.
The episode type defines the level of detail captured in an event episode. The higher the data
resolution, the shorter the period that the monitor can store in its memory. High-resolution data is
suited for neonatal applications, where the clinical situation may change very quickly. In adult
monitoring, where the patient's status typically changes more gradually, a longer trend may be more
informative.
Event Episode Types Pre-time Post-time
Average trend
20 minutes, five samples per minute
2 minutes 18 minutes
4 minutes 16 minutes
6 minutes 14 minutes
8 minutes 12 minutes
10 minutes 10 minutes
12 minutes 8 minutes
14 minutes 6 minutes
16 minutes 4 minutes
18 minutes 2 minutes
HiResTrend
Four minutes, four samples per second.
Neonatal Event Review (NER) is a type of
HiResTrend
1 minute 3 minutes
2 minutes 2 minutes
3 minutes 1 minute
Realtime Wave Snapshot
15 seconds
5 seconds 10 seconds
10 seconds 5 seconds
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