9
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 their arm can increase 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 false reading will be obtained. 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 center). 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 Microlife 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.
c) Tighten the free end of the cuff and close the cuff with the closer.
d) The cuff should be snug on your upper arm, but not too tight. Any clothing
which restricts the arm (e.g. pullover) must be taken off.
e) Lay your arm on a table (palm upwards) so that the cuff is at the same
height as the heart. Make sure that the tube is not kinked.
Note:
If it is not possible to fit the cuff to the left arm, it can also be placed on the
right. However all measurements should be made using the same arm.
5.4. Measurement mode selection
Clinical studies demonstrate taking multiple blood pressure readings and calculating an «average» is more
likely to determine your true blood pressure. This blood pressure monitor allows you to switch to the special
Microlife Average Mode – MAM – that automatically takes multiple readings!
MAM Mode:
a) If you would like to take a MAM measurement, please slide the
switch to the right toward no. 3.
b) MAM mode takes generally 3 measurements in succession and
calculates the result.
c) The « » symbol in the display indicates that the device is
set to the MAM mode.
2–3 cm
tube
