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9.1 Introduction
9.1.1 The Oscillometric Blood Pressure Measurement
This device applies the typical non-invasive blood pressure measurement with the oscillometric method. A
cuff is used to occlude the artery by inflating it above the patient's systolic pressure, and the device
measures the amplitude of pressure changes with pulsation in the cuff as the cuff pressure decreases. The
pulsations increase in amplitude, and reach a maximum, then diminish along with the decrement of cuff
pressure. The cuff pressure at the pulse amplitude backward reduced according to proper proportion is
defined as a systolic pressure (SYS), and the cuff pressure at the pulse amplitude forward reduced according
to proper proportion is defined as diastolic pressure (DIA)
9.1.2 The Oscillometric method vs. the Korotkoff Sound Method
Blood pressure measurements by the oscillometric method and Korotkoff sound method have a reasonable
correlation with the invasive blood pressure measurement. Notwithstanding, any of the non-invasive blood
pressure measurements has its one-sidedness when it is compared to the invasive measurement. Studies
show that the oscillometric method has its advantages over the Korotkoff sound method in less error,
higher reliability, and stability, especially in critical cases such as arrhythmia, vasoconstriction, hypertension,
shock.
9.2 Safety Information
Warnings
When taking the blood pressure measurement on a neonate patient. DO NOT operate in
the Adult mode. The high inflation pressure may cause lesion or even body putrescence.
Even though the monitor can identify the cuff type so it will stop inflation and indicate "Cuff
error" when taking the blood pressure measurement for a neonate in the "Adult" patient
type setting. The user (doctor or nurse) should pay more attention to select the correct
patient type.
It is recommended to take the blood pressure measurement manually
Do not perform NIBP to patients who have a severe hemorrhagic tendency or with sickle
cell disease. Otherwise, partial bleeding appears.
Do not wrap the cuff on limbs with a transfusion tube or intubations or on a skin lesion
area. Otherwise, there may be an injury to the limbs.
If the patient is moving or trembling, hyperkinesia, or arrhythmia, it may cause the inflation
time of inflatable balloon to run longer, which may not only prolong the measurement time
but also result in the cuff wrapped area to suffer purpura, hypoxemia, or neuralgia
because of the friction.
Before the measurement is carried out, select an appropriate measuring mode depending
on the patient type.
The air-hose, which connects the cuff and monitor, should be straight and untangled.
Chapter 9 Monitoring NIBP
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