16 - 6 BeneVision N22/N19 Patient Monitor Operator’s Manual
16.5.4 Changing the Sensitivity
The IBP value displayed on the monitor screen is the average of data collected within a specific time. The shorter
the averaging time is, the quicker the monitor responds to changes in the patient’s blood pressure, and the
higher the sensitivity. Contrarily, the longer the averaging time is, the slower the monitor responds to changes in
the patient’s blood pressure, the lower the sensitivity, but the measurement accuracy will be improved. For
critically ill patients, selecting higher sensitivity will help understanding the patient’s state.
To set the sensitivity, follow this procedure:
1. Select the IBP numeric area or waveform area to enter the corresponding pressure menu.
2. Select the
Setup tab.
3. Set
Sensitivity.
16.5.5 Setting the IBP Waveform
To set the IBP waveform, follow this procedure:
1. Select the IBP numeric area or waveform area to enter the corresponding pressure menu.
2. Select the
Setup tab.
3. Set the following properties of the IBP waveform:
◆ Speed
◆ Scale: if Auto is selected, the size of the pressure’s waveform will be adjusted automatically.
16.5.6 Enabling PPV Measurement
PPV indicates pulse pressure variation. When measuring the arterial pressure (except PA), the PPV measurement
is available. To enable the PPV measurement, follow this procedure:
1. Select the IBP numeric area or waveform area to enter the corresponding pressure menu.
2. Select the
PPV Setup tab.
3. Switch on
PPV Measure.
You can select PPV source after enabling the PPV measurement.
• This monitor can calculate PPV from beat-to-beat values of any arterial pulsatile pressure. The
circumstances under which the calculation of a PPV value is clinically meaningful, appropriate and
reliable must be determined by a physician.
• The clinical value of the derived PPV information must be determined by a physician. According to
recent scientific literature, the clinical relevance of PPV information is restricted to sedated patients
receiving controlled mechanical ventilation and mainly free from cardiac arrhythmia.
• PPV calculation may lead to inaccurate values in the following situations:
◆ at respiration rates below 8 rpm
◆ during ventilation with tidal volumes lower than 8 ml/kg
◆ for patients with acute right ventricular dysfunction (“cor pulmonale”).
• The PPV measurement has been validated only for adult patients.
• The PPV measurement from IBP will automatically be switched off if PiCCO module is working. The
monitor will measure PPV through PiCCO module.
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