VM15 User Manual Masimo SpO2
Monitoring (Option)
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Check alarm limits each time the VM15 with Masimo SET pulse oximetry is used to ensure
that the are appropriate for the patient being monitored.
MEASUREMENTS
⚫ If the accuracy of any measurement does not seem reasonable, first check the
patient’s vital signs by alternate means and the check the VM15 with Masimo SET
pulse oximetry for proper functioning.
⚫ Inaccurate measurements may be caused by:
Incorrect sensor application or use.
Significanst levels of dysfunctional hemoglobins. (e.g., carboxyhemoglobin or
methemoglobin)
Intravascular dyes such as indocyanine green or methylene blue.
⚫ Interfering Substances: Dyes, Nail polish or any substance containing dyes, that
change usual blood pigmentation may cause erroneous readings.
⚫ Pulse rate measurement is based on the optical detection of a peripheral flow pulse
and therefore may not detect certain arrhythmias. The pulse oximeter should not
be used as a replacement or substitute for ECG based arrhythmia analysis.
⚫ Exposure to excessive illumination, such as surgical lamps (especially ones with a
xenon light source), bilirubin lamps, fluorescent lights, infrared heating lamps, or
direct sunlight (exposure to excessive illumination can be corrected by covering the
sensor with a dark or opaque material).
⚫ SpO2 is empirically calibrated to functional arterial oxygen saturation in healthy
adult volunteers with normal levels of carboxyhemoglobin (COHb) and
methemoglobin (MetHb). A pulse oximeter cannot measure elevated levels of COHb
or MetHb. Increases in either COHb or MetHb will affect the accuracy of the SpO2
measurement.
⚫ For increased COHb: COHb levels above normal tend to increase the level of SpO2.
The level of increase is approximately equal to the amount of COHb that is present.
High levels of COHb may occur with a seemingly normal SpO2. When
elevated levels of COHb are suspected, laboratory analysis (CO-Oximetry)
of a blood sample should be performed.
For increased MetHb: the SpO2 may be decreased by levels of MetHb of
up to approximately 10% to 15%. At higher levels of MetHb, the SpO2 may
tend to read in the low to mid 80s. When elevated levels of MetHb are
suspected, laboratory analysis
(CO-Oximetry) of a blood sample should be performed.
Venous congestion may cause under reading of actual arterial oxygen
saturation. Therefore, assure proper
venous outflow from monitored site. Sensor should not be below heart
level (e.g. sensor on hand of a patient in a bed with arm dangling to the
floor).
⚫ Venous pulsations may cause erroneous low readings (e.g.
tricuspid value regurgitation).
⚫ The pulsations from intra-aortic balloon support can be additive
to the pulse rate on the oximeter pulse rate display. Verify
patient's pulse rate against the ECG heart rate.
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