Rad-67
Chapter 1: Technology Overview
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21
Masimo
General Description for Pulse Rate (PR)
Pulse rate (PR), measured in beats per minute (BPM) is based on the optical detection of
peripheral flow pulse.
General Description for Perfusion Index (Pi)
The Perfusion Index (Pi) is the ratio of the pulsatile blood flow to the non-pulsatile or static
blood in peripheral tissue. Pi thus represents a noninvasive measure of peripheral perfusion
that can be continuously and noninvasively obtained from a pulse oximeter.
Signal IQ
The Signal IQ provides an indicator of the assessment of the confidence in the displayed
SpO
2
value. The SpO
2
SIQ can also be used to identify the occurrence of a patient’s pulse.
With motion, the plethysmographic waveform is often distorted and may be obscured by
noise artifact. Shown as a vertical line, the SpO
2
SIQ coincides with the peak of an arterial
pulsation. Even with a plethysmographic waveform obscured by artifact, the Signal IQ
identifies the timing that the algorithms have determined for the arterial pulsation. The
pulse tone (when enabled) coincides with the vertical line of the SpO
2
SIQ.
The height of the vertical line of the SpO
2
SIQ provides an assessment of the confidence in
the measurement displayed. A high vertical bar indicates higher confidence in the
measurement. A small vertical bar indicates lower confidence in the displayed
measurement. When the Signal IQ is very low, this suggests that the accuracy of the
displayed measurement may be compromised. See
About the Status Bar
on page 34.
rainbow Pulse CO-Oximetry Technology®
rainbow Pulse CO-Oximetry technology is governed by the following principles:
1.
Oxyhemoglobin (oxygenated blood), deoxyhemoglobin (non-oxygenated blood),
carboxyhemoglobin (blood with carbon monoxide content), methemoglobin
(blood with oxidized hemoglobin) and blood plasma constituents differ in their
absorption of visible and infrared light (using spectrophotometry).
2.
The amount of arterial blood in tissue changes with pulse
(photoplethysmography). Therefore, the amount of light absorbed by the varying
quantities of arterial blood changes as well.
