11-6
11.6 Measurement Limitations
If you doubt the measured SpO
2
, check patient vital signs first. Then check the patient
monitor and SpO
2
sensor. The following factors may influence the accuracy of measurement:
Ambient light
Physical movement (patient and imposed motion)
Diagnostic testing
Low perfusion
Electromagnetic interference, such as MRI environment
Electrosurgical units
Dysfunctional haemoglobin, such as carboxyhemoglobin (COHb)and methemoglobin
(MetHb)
Presence of certain dyes, such as methylene and indigo carmine
Inappropriate positioning of the SpO
2
sensor, or use of incorrect SpO
2
Drop of arterial blood flow to unmeaurable level caused by shock, anemia, low
temperature or vasoconstrictor.
11.7 Masimo Information
Masimo Patents
This device is covered under one or more of the following U.S.A. patents: 5,758,644,
5,823,950, 6,011,986, 6,157,850, 6,263,222, 6,501,975, 7,469,157 and other applicable
patents listed at: www.masimo.com/patents.htm.
No Implied License
Possession or purchase of this device does not convey any express or implied license to use
the device with unauthorized sensors or cables which would, alone, or in combination with
this device, fall within the scope of one or more of the patents relating to this device.
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