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Performance Considerations
Performance
Considerations
Dysfunctional Hemoglobins
134
Certain patient conditions can affect the measurements of the N-600x
and cause the loss of the pulse signal.
Inaccurate measurements can be caused by:
•
incorrect sensor application
•
failure to cover the sensor with opaque material in high
ambient light conditions
•
dysfunctional hemoglobins
•
poor peripheral perfusion
•
excessive patient activity
•
venous pulsations
•
intravascular dyes, such as indocyanine green or
methylene blue
•
externally applied coloring agents (nail polish, dye,
pigmented cream)
•
defibrillation
Dysfunctional hemoglobins such as carboxyhemoglobin,
methemoglobin, and sulphemoglobin are unable to carry oxygen.
SpO
readings may appear normal; however, a patient may be
2
hypoxic because less hemoglobin is available to carry oxygen.
Further assessment beyond pulse oximetry is recommended.
N-600x Operator's Manual
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