Digicare Biomedical Technology
Operators Manual Multi-parameter Patient Monitor " LifeWindow Lite LW8 "
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SECTION 7 - NIBP MONITORING
A. CUFF SELECTION AND PLACEMENT
The use of properly designed and sized cuffs is essential for the accurate non-invasive
measurement of blood pressure.
The widest cuff that can be placed around the limb should be used. A cuff that is too small for
the limb will not supply sufficient occlusion pressure to the artery. This can cause an
erroneously high blood pressure reading. Ideally, cuff width should be 40% of the limb
circumference. Substitution of a cuff different from that supplied might result in a
measurement error.
NOTE:
Overlapping the cuff will not affect the measurement results.
• For best results, a cuff should be wrapped for a snug fit and be positioned reasonably close to
heart level. Measurements made above the level of the heart will give reduced blood pressure
readings. Measurements made below the heart level will give increased readings.
NOTE:
Avoid compression or restriction of the NIBP Inflation Hose. The hose must not be
kinked or pinched.
WARNING:
The cuff should not be applied on a limb being used for an intravenous infusion. Do
not place the cuff on any extremity being used for SpO2 monitoring.
CUFF SIZE SELECTION
• The widest cuff that can be placed on the patient, without extending beyond the joint, should
be selected. Appropriate sized cuffs may be selected based on published guidelines that cuff
width should be 40 – 60% of limb circumference. The cuff should be wrapped for a snug fit.
• Overlapping the cuff will not affect measurement results. Make sure the hook and loop
sections of the cuff are fully engaged when it is wrapped around the limb. If not fully engaged,
the cuff will detach during bladder inflation. If that happens, select the next size bigger cuff.
• The correct selection of cuff size have a significant influence measurement accuracy. A cuff
that is too narrow will produce artificially elevated readings, while a cuff that is too wide wi ll
produce spuriously low values.
• The monitor comes standard with six different sizes of cuffs. They are marked to aid in proper
cuff selection. When a cuff is wrapped around a site, its index edge should be in the range
indicated on the cuff. The cuff is too small or too large if the index edge is outside the range.
Arm
Locate the cuff as you would to do an auscultatory blood pressure. Place the cuff around the
patient’s upper arm with the bottom edge of the cuff at least one inch above the inner aspect of
the arm. As the cuff is wrapped around the arm, be sure it fits snugly and evenly, and the
bladder of the cuff is over the brachial artery.
Thigh
Place the cuff around the patient’s thigh with the bottom edge of the cuff at least one inch above
the inner aspect of the knee. Be sure the cuff fits snugly and evenly, and the bladder of the cuff
is over the popliteal artery.
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