Oridion Capnostream 20p, Руководство оператора

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Alarm Limits - Factory Defaults
Portable Bedside Capnograph/Pulse Oximeter 81
SatSeconds is calculated by multiplying the number of percentage points that the %SpO
2
falls outside of alarm
limit by the number of seconds that the %SpO
2
level remains outside that limit. This can be stated as an
equation
:
Points x Seconds = SatSeconds
Where:
Points = %SpO
2
percentage points outside of the limit
Seconds = number of seconds the %SpO
2
remains at that point outside of the limit.
The alarm response time, assuming a SatSeconds limit set at 50 and the SpO
2
LOW alarm limit set at 90, is
described and illustrated below.
In this example, the %SpO
2
level drops to 88 (2 points) and remains there for a period of 2 seconds
(2 points x 2 seconds = 4 SatSeconds).
The %SpO
2
then drops to 86 for 3 seconds and then to 84 for 6 seconds.
The resulting SatSeconds are:
%SpO
2
Seconds SatSeconds
2 x 2 = 4
4 x 3 = 12
6 x 6 = 36
Total SatSeconds = 52
After approximately 10.9 seconds the SpO
2
alarm would sound, because 50 SatSeconds had been exceeded
(note the arrow in the figure below)
.
Saturation levels may fluctuate rather than remain steady for a period of several seconds. Often, the %SpO
2
levels may fluctuate above and below the alarm limit, re-entering the non-alarm range several times
.
During such fluctuations, the Capnostream integrates the number of %SpO
2
points, both positive and negative,
until either the SatSeconds limit (SatSeconds time setting) is reached, or the %SpO
2
level returns to within a
normal range and remains there
.
177B
SatSeconds Alarm Display
SatSeconds are displayed in the SpO
2
display area on the monitor screen. When SatSeconds is enabled and the
SpO
2
reading is below the minimum, the SatSeconds counter will begin. If the SatSeconds limit is been reached,
an audible alarm sounds and the displayed %SpO
2
numeric rate flashes. As with standard alarm management
,
the audible alarm may be silenced by pressing the ALARM SILENCE button ( )
.