Chapter 9: Non-invasive Blood Pressure
9-2 Veterinary Vital Signs Monitor Operation Manual
CAUTION! Proper blood pressure cuff size and placement are essential to
the accuracy of the blood pressure determination.
CAUTION! Any blood pressure recording can be affected by the position of
the patient, his or her physiologic condition, and other factors.
CAUTION! Blood pressure measurements should be interpreted by a
physician.
NOTE! There are no user-serviceable adjustments for the Non-Invasive
Blood Pressure calibration verification. If the monitor appears to
be out of calibration, contact your authorized repair center for
help.
NOTE! Systolic and diastolic blood pressure measurements determined
with this device are equivalent to those obtained by the trained
observer using the cuff/stethoscope auscultation method, within
the limits prescribed by the Chinese National Standard, Electronic
or Automated Sphygmomanometers.
NOTE! Mean arterial blood pressure measurements determined with this
device are equivalent to those obtained by an intra-arterial blood
pressure measurement device as determined by Utech Co., Ltd.
9.3 NIBP Theory of Operation
The Vital Signs Monitor uses oscillometric principles to calculate the systolic,
diastolic and mean arterial pressure values from the blood pressure cuff.
When the blood pressure cuff is inflated it creates an occlusion of the artery
on the limb being used. The cuff is then deflated by a set amount of pressure
in the cuff. When an oscillometric pulse is identified, another similar pulse
must also be identified and measured before it steps down again. This method
of measuring blood pressure ensures the measurement is a true measurement
and not a change in the cuff due to motion. If the measurement is not
reproduced a second time, it is not recorded and the pressure is stepped
down. Once two identical oscillations are obtained the cuff deflates. In other
words, it will only capture readings that are reproduced; if there are no similar
oscillations at that pressure, the reading is discarded as artifact. This type of
oscillometric technology is more motion tolerant and generally produces a
higher success rate than other NIBP technologies.
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