User's Manual

Radical-7 Chapter 6: Alarms and Messages
www.masimo.com 99 Masimo
Desat Index Alarms
From the Alarms screen, change any of the following options:
Options
Description
Factory Default
Settings
User Configurable
Settings
Delta
See Overview of Desat Index
Alarm on page 98.
4%
2% to 10% in steps of
1%.
Time
See Overview of Desat Index
Alarm on page 98.
1 hour
1 to 4 hours, in steps
of 1.
# of Events
See Overview of Desat Index
Alarm on page 98.
Off
Off, 1 to 24
desaturations in
steps of 1.
Overview of Perfusion Index (PI) Delta Alarm
The PI Delta Alarm is a user-selectable feature which allows a clinician to request an audible
and visual alarm 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. The
Radical-7 measures perfusion at the SpO2 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 and 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 may need to be addressed.
The PI Delta provides an audible and visual alert to important changes in perfusion
compared to the patient’s baseline PI rate. The baseline is set by the Radical-7 once the user
has enabled the alarm. The baseline is 30 seconds of currently averaged PI. 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 Settings on page 99.
*De Felice C, Latini G, Vacca P, Kopotic RJ. The pulse oximeter perfusion index as a predictor
for high illness severity in neonates. Eur J Pediatr. 2002;161:561-562.
PI Delta Settings
From the PI Delta Settings screen, you can access the following screens:
Overview of Perfusion Index (PI) Delta Alarm on page 99.
Accessing Parameter Information on page 59.