Masimo Radical Signal Extraction Manual del operador descargar pdf (Pagina 45)

Radical-7 Signal Extraction Pulse CO-Oximeter Operator’s Manual 4-5

Operation

■ Intravascular dyes such as indocyanine green or methylene blue.

■ Low arterial perfusion.

■ Low arterial oxygen saturation levels.

■ Elevated Total Bilirubin levels.

■ Motion artifact.

NUMERIC DISPLAY - SpHb

A stable SpHb reading is associated with correct sensor placement, small physiological changes

during the measurement and acceptable levels of arterial perfusion at the measurement site.

Physiological changes at the measurement site are mainly caused by fluctuations in the oxygen

saturation, blood concentration and perfusion. Inaccurate measurements may be caused by:

■ Intravascular dyes such as indocyanine green or methylene blue.

■ Low arterial perfusion.

■ Low arterial oxygen saturation levels.

■ Elevated Total Bilirubin levels.

■ Motion artifact.

NUMERIC DISPLAY - SpOC

A stable SpOC reading is associated with stable readings for both SpO

and SpHb which

comes with correct sensor placement, small physiological changes during the measurement

and acceptable levels of arterial perfusion at the measurement site. Physiological changes

at the measurement site are mainly caused by fluctuations in the oxygen saturation, blood

concentration and perfusion. Inaccurate measurements may be caused by:

■ Low arterial perfusion.

■ Low arterial oxygen saturation levels.

■ Elevated Total Bilirubin levels.

■ Motion artifact.

■ Elevated levels of carboxyhemoglobin.

■ Elevated levels of methemoglobin.

■ Severe anemia may cause erroneous SpOC readings.

NUMERIC DISPLAY - (PI)

The perfusion index (PI) display provides a relative numeric indication of the pulse strength at the

monitoring site. It is a calculated percentage of the pulsatile signal to non-pulsatile signal of arterial

blood moving through the site. PI may be used to find the best perfused site and to monitor physiologi-

cal changes in the patient. It displays an operating range of 0.02 percent to 20.00 percent. A percent-

age greater than 1.00 percent is desired. Extreme changes in the display number are due to motion

artifact and changes in physiology and blood flow. The PI measurement is displayed as follows:

≤ 0.99 (2 decimal places)

1.0 to 9.9 (1 decimal place)

≥10 (0 decimal places)

PLETH VARIABILITY INDEX - (PVI)

The pleth variability index (PVI) is a measure of the dynamic changes in the perfusion index

(PI) that occur during the respiratory cycle. The calculation is accomplished by measuring

changes in PI over a time interval where one or more complete respiratory cycles have

occurred. PVI is displayed as a percentage (0-100%).

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