Pronto
Chapter 6: Troubleshooting
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40
Masimo
Low Perfusion
It has been suggested that at extremely low perfusion levels, Pulse CO-Oximeters can
measure peripheral saturation which may differ from central arterial saturation*. This
“localized hypoxemia” may result from the metabolic demands of other tissues extracting
oxygen proximal to the measurement site under conditions of sustained peripheral
hypoperfusion. (This may occur even with a pulse rate that correlates with the ECG heart
rate.)
Low Signal I.Q. (Low SIQ)
Note
: The Display Measurements During Low SIQ option (
DPL
) must be turned on to
display measurements (SpO2, PR, PI, and SpHb) under Low SIQ conditions. For more
information about changing this setting, see
Default Settings
on page 29 and
Navigating the
Menu
on page 31.
Pronto provides a visual indicator (LED), the
Low SIQ Indicator
, which provides an
assessment of the confidence of the measurement displayed.
When the
Low SIQ Indicator
illuminates, confidence in the measurement displayed is low.
Proceed with caution and do the following:
•
Assess the patient.
•
Check the sensor and ensure proper sensor application. The sensor must be well
secured to the site to obtain accurate readings. Also, misalignment of the sensor’s
emitter and detector can result in low SIQ.
•
Determine if an extreme change in the patient’s physiology and blood flow at the
measurement site occurred, (e.g. an inflated blood pressure cuff, a squeezing
motion, sampling of an arterial blood specimen from the hand containing the
pulse oximetry sensor, severe hypotension, peripheral vasoconstriction in
response to hypothermia, medications, or an episode of Raynaud’s syndrome.)
•
Read
Safety Information, Warnings, and Cautions
on page 9 and the sensor
Directions for Use (DFU)
.
After performing the above, perform another spot check. An arterial blood specimen for
laboratory CO-Oximetry analysis may be considered to verify the oxygen saturation and
hemoglobin values.
