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Chapter 9: SpO2 & Rainbow Parameters Monitoring
measurement is ml/dL (milliliters of oxygen per deciliter of blood).
SpCO
This parameter indicates the level of carbon monoxide concentration in arterial blood. It is
expressed as a percentage of hemoglobin bound with carbon monoxide.
SpMet
This parameter indicates the level of methemoglobin concentration in arterial blood. The amount
is expressed as percentage (ratio of methemoglobin to total hemoglobin in blood)
Pleth Variability Index
This parameter is to measure dynamic changes in PI during the respiratory cycle which can be
extremely associated with intrathoracic pressure changes.
PVI can be a useful noninvasive monitoring method or an advanced indicator to detect
physiological changes of intrathoracic pressure. During one or two complete respiratory cycle,
PVI is calculated as follows:
PVI can help clinicians predict fluid responsiveness in patients.
■ The %SpO2, PR, PI, PVI, SpOC, %SpMet, %SpCo and SpHb values can be displayed on the
main screen. The Pleth waveform is displayed as normalized waveform and its amplitude does
not comply with real blood volume variations.
■ User can be informed of inadequacy of signal and physiological parameters values by various
messages and alarms in necessary situations.
9-4
User Manual
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