User’s manual of CLEO Patient Monitor
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MEASUREMENT LIMITATIONS
1. The measurement is determined by the pulse of the blood flow in the arterial blood
vessels. The arterial blood flow may decrease to such a level that it cannot be
measured under the following conditions:
Shock
Hypothermia
Vasoactive medicines are applied
Anemia
2. The measurement is also determined by how well the oxyhemoglobin and
reduced-hemoglobin absorb the light of the specific wave-length being used. If there
are other substances that can absorb light of the same wave-length, they can cause
the measurement to be inaccurate or lower than the actual value of SpO
2
. For
example:
Carboxyhemoglobin
Methemoglobin
Methylene blue
Carmine indigo
3. Intense light in the environment can also influence measurement. Using a light-tight
material to cover the sensor can improve the quality of the measurement.
SPO2 ERROR MESSAGES
PLETH Waveform may display messages as below:
PROMPTS EXPLAINATION
Search Too Long Search-time of SpO
2
is too long.
Searching For Pulse. . . Searching for pulse signal.
Sensor Off
Sensor has fallen off or the finger is not
inserted in the finger-probe.
SpO
2
Com Error
SpO
2
board has communication error with
the mainboard.
Prolonged and continuous monitoring may increase the chances of unexpected
changes in dermal condition, like
abnormal sensitivity, rubescence, vesicle,
repressive putrescence, and so on. It is especially important with neonate patients
and patients
of poor perfusion or immature dermogram to check the sensor
placement by light collimation and by re-attaching the sensor depending on the
condition of the skin. Check the sensor placement regularly and move it when the
skin deteriorates. More frequent examinations may be required for different
patients.
DO NOT use SpO
2
sensors during magnetic resonance imaging (MRI). Induced
current could potentially cause burns. The sensor may affect the MRI image, and
the MRI unit may affect the accuracy of the oximetry measurements.
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