The industry-standard technique of oscillometry is used for non-invasively measuring systolic blood pressure (SBP) and diastolic blood pressure (DBP). The method is based on the measurement of oscillations through the occluding cuff which is placed on the patient’s upper arm during an NIBP measurement. The pulsatile oscillations are measured using a pressure transducer and then digitized using a microprocessor. The NIBP algorithm used the digitized oscillations and applied cuff pressure as input to an empirical model to calculate SBP and DBP.
Blood pressure measurements can be affected by the patient’s position and/or physiological condition.
- The cuff should be at the same level as the patient’s heart.
- NIBP measurements may not be reliable in the presence of atrial fibrillation or ventricular arrhythmias.
- Improper cuff size or application may lead to inaccurate readings.
The ViSi Mobile has three BP modes: one-time, interval, and continuous. The Monitor will automatically default to NIBP mode depending on which sensors are connected. You only need to select an NIBP mode if you want to change the default.
Select Menu and choose the BP icon (second icon on top row) to change the BP mode if the icon does not reflect the mode you want to be in.
- When only the thumb sensor is connected, the monitor will default to one-time mode and this icon will display when the cuff module is connected:
- When the thumb and chest sensor are connected, the monitor will default to continuous mode and this icon will display:
- To set the interval mode, access the menu, select the BP icon, select the middle icon with green arrows and set your interval time. This icon will display:
On initial entry into the BP Management screen, the default blood pressure mode will automatically be selected. The default mode is dependent on the connected sensors and the cNIBP license. As long as the NIBP Module is plugged in, a manual NIBP measurement can be initiated at any time. When the NIBP mode is set to Automatic, if the timing of the manual measurement overlaps with the automatic measurement interval, then that automatic measurement is skipped; otherwise, the automatic measurement occurs as scheduled.
When obtaining any BP, remember that the displayed icon when you connect the cuff module displays what type of BP will be taken.
Other important notes:
- The ViSi Mobile Monitor should never be used to measure the NIBP of one patient while the Monitor is simultaneously connected to another patient.
- Do not attempt to take NIBP measurements with the ViSi Mobile Monitor while the patient is undergoing cardio-pulmonary bypass.
- Do not attempt to take NIBP measurements with the Visi Mobile Monitor while the patient is being treated with an intra-aortic balloon pump or left ventricular assist device.
- Periodically observe the patient’s arm for signs of impaired circulation, which may be a result of NIBP measurements made too frequently. Loosen or remove the ViSi Mobile Disposable Cuff if signs and/or symptoms of prolonged impaired circulation are evident.
- If you are uncertain of the reliability of an NIBP measurement, repeat the measurement. If the reading is still suspect, use another method to measure the blood pressure.
- The ViSi Mobile Disposable Cuff should be snug enough to support the Cuff Module while not impairing circulation when deflated.
- Avoid touching the ViSi Mobile Disposable Cuff during cuff inflation as it may disrupt the measurement.
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