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Radical-7R Pulse CO-Oximeter Operator’s Manual
1
O v e r v i e w
1
the hemoglobin concentration in g/dL times three and dropping the units
1,2
. The hematocrit
measurement is determined mathematically in this monitor as:
%Hct = Hb* g/dL x 2.953
* When Hb concentrations are between 8-17 g/dL.
1
Nijboer JMM, van der Horst ICC, Hendriks HGD, Hendrik-Jan ten Duis; Mijsten MWN. Myth or Reality:
Hematocrit and Hemoglobin Differ in Trauma. Journal of TRAUMA Injury, Infection, and Critical Care 2007;
62:1310-1312
2
MS, Weatherall; KM Sherry. An evaluation of the Spuncrit infr-red analyzer for measurement of Haema-
tocrit: Clin. Lab. Haem. 1997, 19, 183-186
PRINCIPLE OF OPERATION
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).
Carboxyhemoglobin
Oxyhemoglobin
Methemoglobin
Deoxyhemoglobin
Absorption Spectra
Plasma
Absorption (1/mm)
0
0.5
600
800
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1000
1200
1400
1600
Wavelength (nm)
2. The amount of arterial blood in tissue changes with your pulse (photoplethysmography). Therefore,
the amount of light absorbed by the varying quantities of arterial blood changes as well.
The Radical-7R Pulse CO-Oximeter uses a multi-wavelength sensor to distinguish between oxygenated
blood, deoxygenated blood, blood with carbon monoxide, oxidized blood and blood plasma. The Radical-
7R utilizes a sensor with various light-emitting diodes (LEDs) that pass light through the site to a diode
(detector). Signal data is obtained by passing various visible and infrared lights (LEDs, 500 to 1400nm)
through a capillary bed (for example, a fi ngertip, a hand, a foot) and measuring changes in light absorption
during the blood pulsatile cycle. This information may be useful to clinicians. The maximum radiant power
of the strongest light is rated at
≤
25 mW. The detector receives the light, converts it into an electronic
signal and sends it to the Radical-7R for calculation.
Once the Radical-7R receives the signal from the sensor, it utilizes Masimo Rainbow SET
signal extraction technology to calculate the patient’s functional oxygen saturation (SpO2
(%)), blood levels of carboxyhemoglobin (SpCO (%)), methemoglobin (SpMet (%)), Total
Hemoglobin concentration (SpHb (g/dl)) and pulse rate (PR (BPM)). The SpCO, SpMet and
1. Light Emitting Diodes (LEDs)
(7 + wavelengths)
2. Detector
2
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