P1 Patient Monitor User’s Manual
10-7
For example, the figure below demonstrates the alarm response time with a Sat-Seconds
limit set at 50 and a low SpO
2
limit set at 90%. In this example, the patient SpO
2
drops to
88% (2 points) and remains there for 2 seconds. Then it drops to 86% (4 points) for 3
seconds, and then to 84% (6 points) for 6 seconds. The resulting Sat-Seconds are:
% SpO
2
Seconds Sat-Seconds
2×
2＝
4
4×
3＝
12
6×
6＝
36
Total Sat-Seconds＝
52
After approximately 10.9 seconds, a Sat-Second alarm would sound, because the
limit of 50 Sat-Seconds would have been exceeded.
Saturation levels may fluctuate rather than remaining steady for a period of several
seconds. Often, the SpO
2
of patient may fluctuate above and below the alarm limit,
re-entering the non-alarm range several times. During such fluctuation, the monitor
integrates the number of SpO
2
points, both positive and negative, until either the Sat-
Seconds limit is reached, or the patient SpO
2
re-enters the non-alarm range and remains
there.
10.7.3. Setting the Sat-Seconds (Only for Nellcor SpO
2
)
You can set the Sat-Seconds through follow this procedure:
1. Select the SpO
2
parameter area or waveform area to enter the【SpO
2
】menu.
2. Select【Alarm】submenu.
3. Set 【Sat-Seconds】.
10.7.4. Setting Sensitivity (Only for BLT SpO
2
)
The SpO
2
value displayed on the monitor screen is the average of data collected
within a specific time. The higher the sensitivity, the quicker the monitor responds to
changes in the patient’s oxygen saturation level. Contrarily, the lower the sensitivity, the
slower the monitor responds to changes in the patient’s oxygen saturation level, but the
SpO
2
measurement is more stable. For critically ill patients, selecting shorter averaging
time will help understanding the patient’s state.
To set the sensitivity, follow this procedure:
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