Rad-57 Signal Extraction Pulse CO-Oximeter Operator’s Manual 4-5
4
operation
NUMERIC DISPLAY - PULSE RATE
The Pulse Rate displayed on the Rad-57 may differ slightly from the heart rate displayed
on ECG monitors due to differences in averaging times. There may also be a discrepancy
between cardiac electrical activity and peripheral arterial pulsation. Significant differences
may indicate a problem with the Signal IQ due to physiological changes in the patient or
one of the instruments or application of the sensor or patient cable. The pulsations from
intra-aortic balloon support can be additive to the pulse rate displayed on the Pulse CO-
Oximeter.
NUMERIC DISPLAY - SpCO (for applicable models)
A stable SpCO 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:
■ Significant levels of methemoglobin.
■ Intravascular dyes such as indocyanine green or methylene blue.
■ Abnormal hemoglobin levels.
■ Abnormally low arterial perfusion.
NUMERIC DISPLAY - SpMet (for applicable models)
A stable SpMet 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.
Abnormal arterial perfusion
NUMERIC DISPLAY - PI (for applicable models)
The Perfusion Index (PI) display provides a relative numeric indication of the pulse strength
at the monitoring site. It is a calculated percentage between the pulsatile signal and
nonpulsatile signal of arterial blood moving through the site. PI may be used to find the best
perfused site and to monitor physiological changes in the patient. It displays an operating
range of < .1 percent to > 5 percent on the Rad-57c and Rad-57m and 0.1 percent to 20.0
percent on the Rad-57cm. A percentage greater than 1.00 percent is desired. Extreme
changes in the display number are due to changes in physiology and blood flow.
LOW SIGNAL IQ (LOW SIQ)
The Rad-57 display provides a visual indicator Signal IQ and an alert when the displayed
SpO
2
values are not based on adequate Signal IQ. The Signal IQ indicator is displayed on
the Rad-57 as “Low SIQ”.
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