Troubleshooting - ADInstruments Human NIBP Nano Owner's Manual

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• To initiate a recording in Test mode it is necessary to connect the
finger cuff to C1 of the Wrist Unit by its cuff connector. However, it
is not necessary to attach the air hose connector of the finger cuff
(see Figure 2–23). This allows one to perform a Pressure check by
attaching a precision manometer to the C1 air hose outlet instead.
• In all Test modes the Warning dialog will appear the first time you
click Start. This is a reminder not to apply air pressure to a finger
cuff when it is not wrapped around a finger (or another solid
object!) as this will damage the finger cuff . To start a recording, click
Sample. This dialog will not reappear within the same LabChart
session.
• In all Test modes it takes 15–30 seconds for the Human NIBP Nano
to build up to the correct mode and pressure.

Troubleshooting

Finger cuff application
Correct finger cuff application improves with practice, as do finger
arterial pressure measurements. When initially learning how to use the
Human NIBP Nano, you may find that finger arterial pressure readings
are unusually high or low – this is most oft en due to incorrect positioning
of the finger cuff s, which should be tightly wrapped, absolutely centered
between the knuckles of the middle phalange, and also symmetrically
placed (i.e., not rotated).
Checking measurement accuracy
Before or aft er a measurement, you may wish to measure your volunteer's
brachial arterial pressure using auscultation or a similar, non-invasive
procedure. This can be used to verify that the subject's finger arterial
pressure corresponds with the subject's brachial arterial pressure. Note
that these values can oft en diff er by ±10 mmHg for reasons discussed in
the following chapter
When you remove a finger cuff , aft er stopping a measurement, it is
recommended to inspect the finger to see if you can find the place
where the two components of the plethysmograph have pressed on the
finger skin. Usually, some coloring of these pressure points can be seen
immediately aft er removing the cuff s. Verify that the pressure points were
correctly centered between the knuckles and symmetrically placed.
Human NIBP Nano Owner's Guide