SECTION 4: PULSE OXIMETRY (OPTIONAL FEATURE)
Part No. 715-0080, Rev. B
- 48 -
Low Perfusion (Masimo Only)
The system displays “LP” when there are very low amplitude arterial pulsations. It has been
suggested that at extremely low perfusion levels, pulse oximeters can measure peripheral saturation,
which may differ from central arterial saturation
1
. This “localized hypoxemia” may result from the
metabolic demands of other tissues extracting oxygen proximal to the monitoring site under conditions
of sustained peripheral hypoperfusion. (This may occur even with a pulse rate that correlates with the
ECG heart rate.)
NOTE:
If the low perfusion message is frequently displayed, find a better-perfused monitoring
site. In the interim, assess the patient and, if indicated, verify oxygenation status through
other means.
Low Signal IQ (Masimo Only)
When the signal quality is very low, the accuracy of the SpO
2
measurement may be compromised, and
the system displays “LS” on the PULSE Display Screen. When the “LS” message appears, 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 maintain accurate readings. Also, misalignment of the sensor’s emitter and detector
can result in smaller signals.
Determine if an extreme change in the patient’s physiology and blood flow at the monitoring 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 a spell of Raynaud’s
syndrome).
With neonates or infants, check that the peripheral blood flow to the sensor site is not
interrupted. Interruption, for example, may occur while lifting or crossing their legs during a
diaper change.
1
Severinghaus JW, Spellman MJ. Pulse Oximeter Failure Thresholds in Hypotension and Vasoconstriction.
Anesthesiology 1990; 73:532-537
Содержание AirBORNE A750i
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