Mindray BeneHeart D2, Operator'S Manual

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12 - 4 Defibrillator/Monitor Operator’s Manual
12.6 SpO
2
Monitoring Procedure
1. Select an appropriate sensor according to the module type, patient category and weight.
2. Clean the application site, e.g. removing colored nail polish from the application site.
3. Apply the sensor to the patient.
4. Select an appropriate extension cable according to the connector type and connect it with the equipment.
5. Connect the sensor cable to the extension cable.
6. Switch the Mode Select knob to Monitor.
12.7 Changing SpO
2
Settings
You can enter the [ SpO2 Setup ] menu by selecting the SpO
2
parameter area.
12.7.1 Changing the Speed of the Pleth Wave
In the [ SpO2 Setup ] menu, you select the appropriate setting from [ Sweep ]. The faster the wave sweeps, the
wider the wave is.
12.7.2 Monitoring SpO
2
and NIBP on the Same Limb
When monitoring SpO
2
and NIBP on the same limb simultaneously, you can enable [ NIBP Simul ] from the
[ SpO2 Setup ] menu to lock the SpO
2
alarm status until the NIBP measurement ends. If you disable [ NIBP Simul ],
low perfusion caused by NIBP measurement may lead to inaccurate SpO
2
readings and therefore cause false
physiological alarms.
12.7.3 Sat-Seconds Alarm Management (for Nellcor SpO
2
)
With traditional alarm management, high and low alarm limits are set for monitoring oxygen saturation. During
monitoring, as soon as an alarm limit is violated, an audible alarm immediately sounds. When the patient’s SpO
2
value fluctuates near an alarm limit, the alarm sounds each time the limit is violated. Such frequent alarm can be
distracting.
The Sat-Seconds feature is available with the Nellcor SpO
2
module to decrease the likelihood of false alarms
caused by motion artifacts. The Sat-Seconds limit controls the amount of time that SpO
2
saturation may be
outside the set limits before an alarm sounds. The method of calculation is as follows: the number of percentage
points that the SpO
2
saturation falls outside the alarm limit is multiplied by the number of seconds that it
remains outside the limit. This can be stated as the equation: Sat-Seconds= Points × Seconds
Only when the Sat-Seconds limit is reached, the equipment gives a Sat-Seconds alarm. 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’s 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:
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. Normally, the
patient’s SpO
2
may fluctuate above and below an alarm limit, re-entering the non-alarm range several times.
During such fluctuation, the system sums the number of SpO
2
points, both positive and negative, until either the
Sat-Seconds limit is reached, or the patient’s SpO
2
re-enters the non-alarm range and remains there.
Points Seconds Sat-Seconds
2× 2 = 4
4× 3 = 12
6× 6 = 36
Total Sat-Seconds = 52