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文件编号：NR-TP-0715-008
10.3 Measurement Limits
According to the patient's condition, the oscillometric method has some limitations. This
measurement is to look for the regular pulse waves generated by arterial pressure. If the
patient's condition makes this detection method difficult, the measured value becomes
unreliable, and pressure measurement time increases. The user should be aware that the
following conditions may interfere with measurement method, making the pressure
measurement unreliable or extend the time. In this case, the patient's condition does not allow
measurement.
Patient movement
If the patient is moving, shaking or cramping, the measurement will be unreliable or even
impossible, as these may interfere with the detection of arterial pressure pulse, and extend the
pressure measurement time.
Arrhythmia
If the patient shows arrhythmia which results in irregular heartbeat, the measurement will be
unreliable and even cannot be done, and the pressure measurement time will be extended.
Use of an artificial heart-lung machine
If a patient is connected to an artificial heart-lung machine, the measurement will be
impossible.
Pressure changes
If the arterial pressure pulse is being analyzed to obtain a measured value at a certain time
and the blood pressure of the patient changes rapidly, the measurement will be unreliable or
impossible.
Severe shock
If the patient is in severe shock or hypothermia, the pressure measurement will not be reliable,
because the decrease of blood flow to the periphery would cause decrease in arterial
pulsation.
Limit heart rate
If the heart rate is below 40bpm (beats / min) or above 240bpm (beats / min), the blood
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