Alarm Limits Alarms and Messages
6 - 14 046-003777-00 A5/A3™ Operating Instructions
6.5.3 Auto Alarm Limits
The Auto Alarm Limits function uses an algorithm based on measured values. The relationship is
shown in the
TABLE 6-2.
The Auto Alarm Limits button is disabled when the A5/A3 is in Standby mode, Manual mode or
Monitor mode (with AG module). The Auto Alarm Limits button is also disabled when the current
mode is PS, SIMV-VC, or SIMV-PC.
The parameters in the formula are all measured parameters. The new alarm limits for Paw are
calculated on the basis of average values for PEAK, PLAT, and PEEP. The value used for average uses
the value of the last four ventilation cycles or the value in one minute, whichever is smaller.
Spontaneous breaths by the patient are not taken into account.
If there is not a valid measured minute volume (MV), the corresponding MV alarm limits will not be
adjusted.
If the average value for PEAK, PLAT, and PEEP cannot be calculated, the corresponding alarm limits
will not be adjusted.
If the calculated alarm limit is more than the high threshold of setting range or less than the low
threshold, the corresponding threshold is used as the auto alarm limit.
6.5.4 Setting CO
2
Apnea Delay Time (software bundle version
02.09.00 and later)
The Apnea CO
2
alarm is triggered when no breath is detected within a specified time.
To set the CO
2
Apnea Delay Time:
1. On the main screen, select the Alarms softkey.
The Alarms window displays.
2. Select the Limits tab. (see FIGURE 6-7 and FIGURE 6-8)
3. Select the CO2 Apnea Delay Time button and set it to 10 sec, 15 sec, 20 sec, 25 sec, 30 sec,
35 sec, or 40 sec.
ALARM LIMIT ADJUST FORMULA
Paw High PEAK+5 or PLAT+10, whichever is greater
minimum 35 cmH
2
O
Paw Low (PLAT-PEEP) x 0.6 + PEEP - 1
minimum 3 cmH
2
O
maximum Paw High - 1
MV High MV x 1.4
minimum 2.0 L/min
MV Low MV x 0.6
minimum 0.3 L/min
maximum MV High - 0.1
TABLE 6-2 Auto Alarm Limits
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