Welch Allyn 1500 Patient Monitor v.1.4.X - User Manual - Manual (Page 66)

62 Monitoring and Measurements Welch Allyn 1500 Patient Monitor
Assessing the IPI value
IPI can provide an early indication of a change in ventilatory status which may not be
shown by the current value of any of the four parameters individually. The IPI is designed
to summarize information regarding patient status, possibly before etCO
2
, RR, SpO
2
, or
PR values reach levels of clinical concern. While the IPI highlights a change in ventilatory
status, the root parameters are still required to understand patient status. It is important
to note that different conditions can cause similar IPI values.
The IPI trend graph displays the patient ventilatory status trend in one graph, and thus can
alert you to changes in patient status. The importance of the IPI therefore, lies not only in
its absolute numeric number, but also in its relationship to previous values, so that a graph
can display an upward or downward trend in patient status and indicates that attention or
intervention may be required.
The IPI is modeled on normal healthy patients (ASA Physical Status value of 1 according to
the ASA Physical Status Classification System, as published in Relative Value Guide® -
2008 of the American Society of Anesthesiologists). Patients with ASA Physical Status
values of 3 or higher are expected to have low IPI values by definition. Therefore, for
patients with an ASA Physical Status value of 3 or higher, the IPI may have no added
value.
The range of the IPI is 1-10; values should be understood as seen in the table below.
Index range Patient Status
10 Normal
8 - 9 Within normal range
7 Close to normal range: requires attention
5 - 6 Requires attention and may require intervention
3 - 4 Requires intervention
1 - 2 Requires immediate intervention
Note A graphical trend view of the IPI can be displayed. This is selected in waveforms
(see
“Displaying trend data in the measurements screen” on page 30).
If patient mode is changed, all IPI trend data is purged.