Mindray BeneVew T1 Patient Monitor SpO2 Board 050-000790-01 051-000943-00 Parameter NIBP Board 051-002036-00

Mindray BeneVew T1 Patient Monitor SpO2 Board 050-000790-01 051-000943-00 Parameter Board NIBP Board 051-002036-00

►Brief Introduction

NIBP

The patient monitor uses the oscillometric method for measuring the non-invasive blood pressure (NIBP). This measurement can be used for adults, pediatrics and neonates.

Non-invasive automatic monitoring of blood pressure uses the oscillometric method of measurement. To understand how this method works, we will compare it with the auscultative method. With auscultation, the doctor listens to the blood pressure and determines the systolic and diastolic pressures. The mean pressure can then be calculated with reference to these pressures as long as the arterial pressure curve is normal.

Since the monitor cannot listen to blood pressure, it measures the oscillation amplitudes of the cuff pressure. The oscillations are caused by blood pressure pulses against the cuff. The oscillation with the greatest amplitude is the mean pressure. This is the most accurate parameter measured by the oscillometric method. Once the mean pressure is determined, the systolic and diastolic pressures are calculated with reference to the mean.

Briefly, auscultation measures the systolic and diastolic pressures and the mean pressure is calculated. The oscillometric method measures mean pressure and determines systolic and diastolic pressures.

SpO2

SpO2 monitoring is a non-invasive technique used to measure the amount of oxygenated hemoglobin and pulse rate by measuring the absorption of selected wavelengths of light. The light generated in the probe passes through the tissue and is converted into electrical signals by the probe's photodetector. The SpO2 module processes the electrical signal and displays a waveform and digital values for SpO2 and pulse rate.

When monitoring SpO2 and NIBP on the same limb simultaneously, you can switch [NIBP Simul] on in the [SpO2 Setup] menu to lock the SpO2 alarm status until the NIBP measurement ends. If you switch [NIBP Simul] off, low perfusion caused by NIBP measurement may lead to inaccurate SpO2 readings and therefore cause false physiological alarms.

► Measurement Limitations

If you doubt the SpO2, measurement, check the patient’s vital signs first. Then check the patient monitor and SpO2 sensor. The following factors may influence the accuracy of measurement:

• Ambient light
• Physical movement (patient and imposed motion)
• Diagnostic testing
• Low perfusion
• Electromagnetic interference, such as MRI environment
• Electrosurgical units
• Dysfunctional haemoglobin, such as carboxyhemoglobin (COHb)and methemoglobin (MetHb)
• Presence of certain dyes, such as methylene and indigo carmine
• Inappropriate positioning of the SpO2 sensor, or use of incorrect SpO2 sensor
• Drop of arterial blood flow to immeaurable level caused by shock, anemia, low temperature or vasoconstrictor.

► Specification

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