Operator's Manual

Rad-97 Chapter 13: Alarms and Messages
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changes from patients’ baseline saturation levels. However, in select patient populations,
substantial desaturation events that remain above a typical low alarm limit threshold may be
preceded by a cycle of smaller transient desaturations over a limited period of time. The
ability to alert clinicians when a cycle of smaller transient desaturations occur may provide
an earlier indication of a potential significant decline in patient status, allowing for more
focused monitoring and/or a change in treatment.
To address the select patient populations in which detecting a cycle of transient
desaturations may be helpful, set a 3D Desat Index Alarm.
To set a 3D Desat Index Alarm see Desat Index on page 159.
Desat Index
From the Desat Index menu screen, change any of the following options:
Options Description Factory
Default
Settings
User Configurable
Settings
Delta The change in saturation from the
patient's baseline measurement.
4% 2% to 10%, in steps of
1%.
Time The period of time in which saturation
events that exceed the delta will be
monitored.
1 hour 1 to 4 hours, in steps
of 1 hour.
Number of
Events
The number of desaturations exceeding
the delta which will activate audible and
visual alarms.
Off Off, 1 to 24
desaturations in
steps of 1.
About Pi Delta
The Perfusion Index (Pi) Delta Alarm allows a clinician to request audible and visual alarms if
perfusion at the monitored site decreases by a specified level (delta) over a specific period of
time.
Perfusion Index gives an indication of the level of perfusion at the monitored site. Rad-97
measures perfusion at the monitored SpO
2
site by comparing the pulsatile signal to the
non-pulsatile signal, and expressing that ratio as a percentage. Pi has been clinically proven
to be useful as a predictor of the level of illness in neonates and adults. It has also been
shown that Pi may change dramatically in response to sympathetic changes caused by
inhalational agents and pain stimulation.* If Pi decreases over time, there may be underlying
physiological reasons that need to be addressed.
Pi Delta audibly and visually alerts the user to important changes in a patient's perfusion, as
compared to the patient’s baseline Pi rate. The baseline is set by Rad-97 once the user has
enabled the alarm and represents 30 seconds of currently averaged Pi. To set a Pi Delta
alarm, see Pi Delta on page 160. The feature includes a user-selectable Pi Delta Alarm. This
allows the clinician to request an audible and visual alarm if perfusion at the monitored site
decreases by a specified level (delta) over a specified window of time. Three of the variables
are selectable by the user within established ranges as noted in Pi Delta Alarms.