7 Monitoring Respiration Rate (Resp)
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• the detection level (a dotted line) is not displayed on the waveform,
• the algorithm expects a heart rate and therefore needs at least 3 electrodes attached to the patient.
If you are monitoring respiration with only two electrodes, the detection algorithm becomes less
sensitive which may result in reduced breath detection performance.
Use Auto Detection Mode for situations where:
• the respiration rate is not close to the heart rate
• breathing is spontaneous, with or without continuous positive airway pressure (CPAP)
• patients are ventilated, except patients with Intermittent Mandatory Ventilation (IMV).
Manual Detection Mode
In Manual Detection Mode you must set the Resp detection level.
•In the
Setup Resp menu, select Manual Up or Manual Down. Use the dotted detection level line
in the Resp waveform to determine when the desired level is reached.
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.
Use Manual Detection Mode for situations where:
• the respiration rate and the heart rate are close.
• patients have Intermittent Mandatory Ventilation.
• respiration is weak. Try repositioning the electrodes to improve the signal.
Resp Detection Modes and Cardiac Overlay
In Auto Detection Mode:
If you are monitoring Resp and the 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 rate 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 the section “Lateral Chest Expansion” on page 158.
Changing the Size of the Respiration Wave
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 Setup Resp menu, select Size Up to increase the size of the wave or Size Down to decrease
it.
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