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Warning
If liquid is inadvertently splashed on the equipment or its accessories,
or may enter the conduit or inside the monitor, contact local Customer
Service Center.
Measurement Limitations
To different patient conditions, the oscillometric measurement has certain
limitations. The measurement is in search of regular arterial pressure pulse.
In those circumstances when the patient’s condition makes it difficult
to detect, the measurement becomes unreliable and measuring time
increases. The user should be aware that the following conditions could
interfere with the measurement, making the measurement unreliable or longer
to derive. In some cases, the patient’s condition will make a measurement
impossible.
• Patient Movement
Measurements will be unreliable or cannot perform if the patient is moving,
shivering or having convulsions. These motions may interfere with
the detection of the arterial pressure pulses. In addition, the measurement
time will be prolonged.
• Cardiac Arrhythmia’s
Measurements will be unreliable and may not be possible if the patient’s
cardiac arrhythmia has caused an irregular heartbeat. The measuring time
thus will be prolonged.
• Heart-lung Machine
Measurements will not be possible if the patient is connected to a heart-lung
machine.
• Pressure Changes
Measurements will be unreliable and may not be possible if the patient’s
blood pressure is changing rapidly over the period of time during which
the arterial pressure pulses are being analyzed to obtain the measurement.
• Severe Shock
If the patient is in severe shock or hypothermia, measurements will be
unreliable since reduced blood flow to the peripheries will cause reduced
pulsation of the arteries.
• Heart Rate Extremes
Measurements cannot be made at a heart rate of less than 40 bpm
and greater than 240 bpm.
• Round Patient
The thick fat layer of body will reduce the measurement accuracy, because
the fat that come from the shock of arteries cannot access the cuffs due
to the damping.