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4-6 Radical-7 Signal Extraction Pulse CO-Oximeter Operator’s Manual

Operation

SIGNAL INDICATION AND QUALITY INDICATOR (SIQ)

The Radical-7 Pulse CO-Oximeter display provides a visual indicator of the plethysmogram

signal quality and an alert when the displayed SpO

values are not based on adequate signal

quality. The signal quality indicator displayed on the Radical-7 Pulse CO-Oximeter is called the

SpO

SIQ. The SpO

SIQ can be used to identify the occurrence of a patient’s pulse and the

associated signal quality of the measurement.

With motion, the plethysmographic waveform is often distorted and may be obscured by

artifact. The SpO

SIQ, shown as a vertical line, coincides with the peak of an arterial

pulsation. Even with a plethysmographic waveform obscured by artifact, the Radical-7 Pulse

CO-Oximeter locates the arterial pulsation. The pulse tone (when enabled) coincides with the

vertical line of the SpO

SIQ.

The height of the vertical line of the SpO

SIQ indicates the quality of the measured signal.

A high vertical bar indicates that the SpO

measurement is based on a good quality signal.

A small vertical bar indicates that the SpO

measurement is based on data with low signal

quality. When the signal quality is very low the accuracy of the SpO

measurement may be

compromised, and a "Low SpO

SIQ" message is displayed in the message area on the

Radical-7 Pulse CO-Oximeter display. When the Low SPO

SIQ message appears, proceed

with caution and do the following:

■ Assess the patient.

■ Check the sensor and ensure proper sensor application. The sensor must be well secured

to the site for the Radical-7 Pulse CO-Oximeter to maintain accurate readings. Also,

misalignment of the sensor’s emitter and detector can result in smaller signals and cause

erroneous readings.

■ Determine if an extreme change in the patient’s physiology and blood flow at the monitoring

site occurred, (e.g. an inflated blood pressure cuff, a squeezing motion, sampling of an

arterial blood specimen from the hand containing the pulse oximetry sensor, severe

hypotension, peripheral vasoconstriction in response to hypothermia, medications, or an

episode of Raynaud’s syndrome.)

■ With neonates or infants, check that the peripheral blood flow to the sensor site is not

interrupted. Interruption, for example, may occur while lifting or crossing their legs during a

diaper change.

After performing the above, if the Low SpO

SIQ message is displayed frequently or continuously,

obtaining an arterial blood specimen for CO-Oximetry analysis may be considered to verify the

oxygen saturation value.

Low SpCO SIQ and Low SpMet SIQ

When the signal quality for SpCO and/or SpMet is very low, the accuracy of the SpCO and/or

SpMet measurement(s) may be compromised, and a Low SpCO SIQ and/or Low SpMet SIQ

message is displayed in the message area on the Radical-7 Pulse CO-Oximeter display. When

the Low message(s) appear, proceed with caution and follow the steps listed in Section 4, Signal

Indication and Quality Indicator (SiQ).

Low SpHb SIQ

When the SpHb signal quality is very low, the accuracy of the SpHb measurement may be com-

promised. A Low SpHb SIQ message is displayed in the message area on the Radical-7 Pulse

CO-Oximeter display, and the parameter/measurement value will display dashes (“---”) instead

of a number value for both SpHb and SpOC. In addition, an

icon will appear in the Menu Icon

bar where the Max/APOD icon normally is displayed. An available option is to acknowledge the

Low SpHb SIQ state and display the number, with the understanding that the accuracy of the

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Masimo Radical Signal Extraction Manuale dell'Operatore Pagina 46

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