BeneVision N1 Patient Monitor Operator’s Manual 9 - 5
9.5.6 Setting the Auto Detection Switch
To set the auto detection switch, follow this procedure:
1. Select the Resp numeric area or waveform area to enter the
Resp dialog.
2. Select the
Setup tab.
3. Switch on or off
Auto Threshold Detection.
â—† If Auto Threshold Detection is switched on, the monitor automatically adjusts the Resp waveform
detection level, or threshold.
â—† If Auto Threshold Detection is switched off, you have to manually adjust the Resp waveform
threshold. For more information, see
9.5.7Adjusting the Resp Waveform Detection Threshold.
In the auto threshold detection mode, if you are monitoring Resp and the ECG parameter is switched off, the
monitor cannot compare the heart rate and Resp rates to detect cardiovascular artifact. The respiration
detection level is automatically set higher to prevent the detection of cardiovascular artifact as respiration.
In the manual detection mode (where auto threshold detection is off), cardiovascular artifact can, in certain
situations, trigger the respiration rate counter. This may lead to a false indication of a high respiration or an
undetected zero respiration rate condition. If you suspect that cardiovascular artifact is being registered as
respiratory activity, raise the detection level above the zone of cardiovascular artifact. If the Resp wave is so small
that raising the detection level is not possible, you may need to optimize the electrode placement.
9.5.7 Adjusting the Resp Waveform Detection Threshold
Use the manual detection mode (where auto threshold detection is off) in the following situations:
â– The respiration rate and the heart rate are close.
â– Patients have intermittent mandatory ventilation.
â– Respiration is weak. Try repositioning the electrodes to improve the signal.
To set the Resp waveform threshold to the desired level, follow this procedure:
1. Select the Resp numeric area or waveform area to enter the
Resp dialog.
2. Select the
Threshold tab.
3. Select the up and down arrows below
Upper Line and Lower Line to define the Resp waveform threshold.
Once set, the detection level will not adapt automatically to different respiration depths. It is important to
remember that if the depth of breathing changes, you may need to change the detection level.
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