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4-4 Rad-57 Signal Extraction CO-Pulse Oximeter Operator’s Manual

Rad-57 Signal Extraction CO-Pulse Oximeter Operator’s Manual 4-5

operation

Successful SpO

monitoring

The following general points will aid in ensuring oximetry monitoring success.

■ Place the sensor on a site that is not too thick, has sufficient perfusion and provides

proper alignment of the LED’s and photodetector.

■ Place the sensor on a site that has unrestricted blood flow.

■ Do not constrict the monitoring site when securing a sensor with tape.

■ Do not select a site near potential electrical interference (electrosurgical unit, for

example).

■ Read the sensor Directions for Use for proper sensor application.

NUMERIC DISPLAY - SpO

Stability of the SpO

readings may be a good indicator of signal validity. Although stability

is a relative term, experience will provide a good feeling for changes that are artifactual or

physiological and the speed, timing, and behavior of each. The stability of the readings

over time is affected by the averaging mode being used. The longer the averaging time,

the more stable the readings tend to become. This is due to a dampened response as

the signal is averaged over a longer period of time than during shorter averaging times.

However, longer averaging times delay the response of the oximeter and reduce the

measured variations of SpO

and PR.

CAUTIONS

• Unless indicated otherwise in the directions for use, reposition reusable sensors at least

every 4 hours and adhesive sensors at least every 8 hours.

• Exercise extreme caution with poorly perfused patients; skin erosion and pressure

necrosis can be caused when the sensor is not frequently moved. Assess site at least

every two (2) hours with poorly perfused patients.

• During low perfusion, the sensor site needs to be assessed frequently for signs of tissue

ischemia, which can lead to pressure necrosis.

• With very low perfusion at the monitored site, the readings may read lower than core

arterial oxygen saturation.

• Sensors applied too tightly may cause erroneously low readings.

• Misapplied sensors or sensors that become partially dislodged may cause either over or

under reading of actual arterial oxygen saturation.

• Do not use tape to secure the sensor to the site; this can restrict blood flow and cause

inaccurate readings. Use of additional tape can cause skin damage or damage the

sensor.

operation

• The sensor should be free of visible defects. Never use a damaged sensor or one with

exposed electrical circuitry.

• To prevent damage, do not soak or immerse the sensor in any liquid solution. Do not

attempt to sterilize.

• Carefully route cable and patient cable to reduce the possibility of patient entanglement or

strangulation.

• Intravascular dyes or externally applied coloring (such as nail polish) may lead to

inaccurate SpO

measurements.

• Elevated levels of Carboxyhemoglobin (COHb) may lead to inaccurate SpO

measurements.

• Elevated levels of Methemoglobin (MetHb) will lead to inaccurate SpO

and SpCO

measurements.

• Failure to apply the sensor properly may cause incorrect measurements.

• Do not use the sensor during MRI scanning.

•

If using pulse CO-oximetry during full body irradiation, keep the sensor out of the

irradiation field. If sensor is exposed to the irradiation, the reading might be inaccurate or

the unit might read zero for the duration of the active irradiation period.

• Avoid placing the sensor on any extremity with an arterial catheter or blood pressure

cuff.

• 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.

• Do not modify or alter the sensor in any way. Alterations or modification may affect

performance and/or accuracy.

• Venous congestion may cause under reading of actual arterial oxygen saturation.

Therefore, assure proper venous outflow from monitored site. Sensor should be not 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).

• Circulation distal to the sensor site should be checked routinely

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Masimo Radical Signal Extraction Manuale dell'Operatore Pagina 14

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