Cardinal Health Alaris 8000 Series Directions For Use Manual page 275

8210 Series (Continued)
blood is related to hemoglobin oxygen saturation to identify
the oxygen saturation of arterial hemoglobin, the monitor uses
the pulsatile nature of arterial flow. During systole, a new
pulse of arterial blood enters the vascular bed, and blood
volume and light absorption increase. During diastole, blood
volume and light absorption reach their lowest point. The
p Module bases its
S O
2
between maximum and minimum absorption (measurements
at systole and diastole). By doing so, it focuses on light
absorption by pulsatile arterial blood, eliminating the effects of
nonpulsatile absorbers; such as, venous blood, tissue and
bone.
Because light absorption by hemoglobin is wavelength
dependent and the mean wavelength of
oximeter must know the mean wavelength of the sensor's red
to accurately measure
LED
instrument's software selects coefficients that are appropriate
for the wavelength of that individual sensor's red
coefficients are then used to determine
To compensate for differences in tissue thickness, the light
intensity of the sensor's
The p Module measures functional saturation (oxygenated
S O
2
hemoglobin expressed as a percentage of the hemoglobin
that can transport oxygen). It does not detect significant
amounts of dysfunctional hemoglobin; such as,
carboxyhemoglobin or methemoglobin. In contrast,
hemoximeters (such as,
(oxygenated hemoglobin expressed as a percentage of all
measured hemoglobin, including measured dysfunctional
hemoglobin).
To compare functional saturation measurements to those from
an instrument that measures fractional saturation, fractional
measurements must be converted as follows:
functional saturation=
- (
100 %
Alaris System Directions for Use
®
SpO Modules Section
2
Principle of Operation (Continued)
p measurements on the difference
S O
2
LED
p . During monitoring, the
S O
2
p
S
s is adjusted automatically.
LED
) report fractional saturation
IL482
fractional saturation
carboxyhemoglobin
+ %
s varies, an
. Those
LED
.
O
2
x
100
methemoglobin)
(8210)
General Information
4-31