Operator's Manual

Radical-7 Chapter 1: Technology Overview
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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.
General Description for 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%).
The utility of PVI is unknown at this time and requires further clinical
studies. Technical factors that may affect PVI include probe malposition
and patient motion.
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