Common Sources Of Error; Fitting The Cuff - Microlife BP 3BTO-H Manual De Instrucciones

5.2. Common sources of error

Note: Comparable blood-pressure measurements always require the same conditions! These are normally
always quiet conditions.
• All efforts by the patient to support the arm can increase the blood-pressure. Make sure you are in a
comfortable, relaxed position and do not activate any of the muscles in the measurement arm during
the 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 measured! (Each 15 cm difference in height results in a measurement error of
10 mmHg!)
• Cuffs that are too narrow or too short result in false measurement values. Selecting the correct cuff is
of extraordinary importance. The cuff size is dependent upon the circumference of the arm (measured
in the centre). The permissible range is printed on the cuff. If this is not suitable for your use, please
contact your dealer. Note: Only use clinically approved Original-Cuffs!
• A loose cuff or a sideways protruding air-pocket causes false measurement values.

5.3. Fitting the cuff

a) Push the cuff over the left upper arm so that the tube
points in the direction of the lower arm.
b) Lay the cuff on the arm as illustrated. Make certain
that the lower edge of the cuff lies approximately 2 to
3 cm above the elbow and that the rubber tube leaves
the cuff on the inner side of the arm.
Important! The mark (ca. 3 cm long bar) must lie over
the artery which runs down the inner side of the arm.
c) Tighten the free end of the cuff and close the cuff
with the closer.
d) There must be no free space between the arm and
the cuff as this would influence the result. Clothing
must not restrict the arm. Any piece of clothing which
does (e.g. a pullover) must be taken off.
e) Secure the cuff with the Velcro closer in such a way
that it lies comfortably and is not too tight. Lay the
arm on the table (palm upwards) so that the cuff is at
the same height as the heart. Make sure that the
tube is not kinked.
f) Remain seated quietly for two minutes before you
begin the measurement.
Comment:
If it is not possible to fit the cuff to the left arm, it can
also be placed on the right one. However all measure-
ments should be made using the same arm.
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2–3 cm
tube