Vaunn Medical vB100A, Руководство пользователя

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Chapter 5 Operating the blood pressure monitor
5.1 Before taking measurement

Avoid eating, smoking and any strenuous activity such as exercise before
measurement. These factors can influence the measurement result. It is
recommended that you relax for about ten minutes before measurement.
Example: sitting in an armchair in a quiet environment.

Remove any tight or constricting garment around upper arm.

Always measure from the same arm – typically left arm.

Attempt/plan to carry out measurement regularly around the same time of
day as blood pressure changes during the course of the day.
5.2 Common sources of error
Note: Comparable blood pressure measurements require and/or are
dependent on the same conditions.

Any effort by the user to support his/her arm during measurement can
increase the blood pressure values. Therefore, make sure that the user is in
a comfortable, relaxed position and does not activate any muscles of the
arm during measurement. Use a cushion for support if necessary.

If the arm artery lies considerably lower (higher) than the heart, an
erroneously higher (lower) blood pressure will be registered. Each 15 cm
(5.9 inches) difference in height results in a measurement error of about
10mmHg.

Arm cuff that is too narrow or too short will result in false measurement
values. Using the correct size cuff is crucial in getting accurate
measurement values. The cuff size is dependent on the circumference of
the arm, measured at the center.
Note: only use Vaunn® Medical arm cuff.

A loose cuff or sideway protruding air pocket causes false measurement
values.

Repeated measurements cause blood to accumulate in the arm. This can
lead to false results. Therefore, it is recommended to pause for at least 1
minute between measurements.