9-4 Passport 12/Passport 8 Operator’s Manual
In Auto Detection Mode, if you are monitoring Resp and ECG is switched off, the monitor cannot compare the ECG and
Resp rates to detect cardiac overlay. The respiration detection level is automatically set higher to prevent the detection
of cardiac overlay as respiration.
In Manual Detection Mode, cardiac overlay can in certain situations trigger the respiration counter. This may lead to a
false indication of a high respiration or an undetected apnea condition. If you suspect that cardiac overlay is being
registered as breathing activity, raise the detection level above the zone of cardiac overlay. If the Resp wave is so small
that raising the detection level is not possible, you may need to optimize the electrode placement as described in
section 9.4.4 Lateral Chest Expansion.
9.8 Changing Resp Wave Settings
WARNING
When monitoring in manual detection mode, make sure to check the respiration detection level after you
have increased or decreased the size of the respiration wave.
In the [Resp Setup] menu, you can:
Select [Gain] and then select an appropriate setting. The bigger the gain is, the larger the wave amplitude is.
Select [Sweep] and then select an appropriate setting. The faster the wave sweeps, the wider the wave is.
9.9 Setting Respiration Rate Source
To set RR source:
1. Enter the [Resp Setup] menu.
2. Select [RR Source] and then select a source or [Auto] from the dropdown list.
The dropdown list displays the currently available RR source. When you select [Auto], the system will automatically
select the RR source according to the priority. When the current RR source does not have valid measurement, the system
will automatically switch the [RR Source] to [Auto]. RR source switches back to impedance respiration if you press the
[Alarm Reset] key during an apnea alarm.
The priority of RR source is (from high to low): CO
2
measurement, and impedance respiration measurement. The [RR
Source] settings of Resp, CO
2
, and AG module are linked.
The RR source options and description are shown in the table below.
Option Description
Auto RR source is automatically selected according to the priority.
CO
2
RR source is from CO
2
measurement.
ECG RR source is from impedance respiration measurement.
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