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User Manual for Multi-parameter Patient Monitor North-vision Tech. Inc.
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8.4 Measuring the Blood Pressures
8.4.1 Operational Tips
Like common non-invasive blood pressure measurement, improper operation may cause inaccurate or no result,
or misunderstanding of the measuring information when the oscillating method is used to take the measure of blood
pressure.
1. Requirements of the cuff:
1) Appropriate cuff should be selected according to the age of the subject.
2) Remember to empty the residual air in the cuff before the measurement is commenced.
3) Locate the cuff in such a way that the “φ” mark is at a location where the clearest pulsation of brachial artery
is observed.
4) The cuff should be tightened to a degree where insertion of one finger is allowed.
5) The lower end of the cuff should be 2cm above the elbow joint.
2. The subject should lie on the back so that the cuff and the heart are in a horizontal position and the most
accurate measure can be taken. Other postures may lead to inaccurate measurement.
3. Do not speak or move before or during the measurement. Care should be taken so that the cuff will not be hit
or touched by other objects.
4. The measures should be taken at appropriate intervals. Continuous measurement at too short intervals may
lead to pressed arm, reduced blood flow and lower blood pressure, and resulting in inaccurate measure of
blood pressure. It is recommended the measure be taken at intervals of more than two minutes.
5. With the oscillating method, when blood pressure is measured, the inflation pressure of the cuff will be
automatically adjusted according to the previous measurement. Generally, the initial inflation pressure is
180mmHg (for the adult mode) or 100mmHg (for the infant mode) or 80 mmHg (for the newborn mode) when
it is powered on. Following that, 50mmHg (for the adult mode) or 30mmHg (for infant mode) or 10mmHg (for
the newborn mode) will be added on the basis of the last measurement of systolic pressure. In this way, when
the blood pressure rises or the subject is changed, the blood pressure meter may not give the result after the
first-time inflation. This monitor will automatically adjust the inflation pressure up to 4 times until the accurate
measurement is taken.
6. When an adult subject is monitored, the machine may fail to give the blood pressure measurement result if the
infant or newborn mode is selected.
8.4.2 Clinical Limitations
Please do not perform the monitoring for the patient with the following conditions.
1. Serious angiospasm, vasoconstriction, or too weak pulse.
2. When extremely low or high heart rate or serious arrhythmia of the subject occurs. Especially auricular
fibrillation will lead to unreliable or impossible measurement.
3. Do not perform the measurement when the subject is connected with an artificial heart-lung machine.
4. Do not perform the measurement when the subject uses diuresis or vasodilator.