Criticare Systems, Inc.
VitalCare
TM
506N3 Series Service Manual
Page 1-5
Section 1 —Introduction
Heart Rate
Heart rate measurement is determined primarily by the
plethysmographic (SpO
2
) waveform. When the oximeter is not in use,
the heart rate is determined from the blood pressure data using an
oscillometric method that measures during inflation. The unit of
measurement is beats per minute.
Under conditions where the plethysmographic based heart rate and
the oscillometric heart rate are both beyond the detectable limits of
the monitor, no heart rate is reported. Also, no heart rate is reported
where the amplitude of the plethysmographic waveform and
oscillometric waveform are beyond the detectable limits. The monitor
reports error messages if valid measurements cannot be obtained.
The monitor continues to look for valid SpO
2
based heart rate
measurements and attempts a second NIBP measurement if the first
attempt fails.
DOX
TM
Pulse Oximetry
Measurement (SpO
2
)
The 506N3 Series monitor is available with Digital Oximetry (DOX
™
)
technology to measure blood oxygen saturation (SpO
2
).
Definition
Hemoglobin exists in the blood in several forms:
• Oxygenated (Oxyhemoglobin)
• Reduced (Deoxyhemoglobin)
• Dyshemoglobins (carboxyhemoglobin and methemoglobin.)
In the monitor, SpO
2
(pulse arterial oxygen saturation) is the ratio of
oxygenated hemoglobin to the sum of oxygenated hemoglobin plus
hemoglobin which is available for binding to oxygen, as expressed in
the following formula:
Dyshemoglobins, such as carboxyhemoglobin and methemoglobin,
are not directly measured and therefore are not factored into the
measurement.
DOX Digital Oximetry
The monitor does not use analog circuitry for signal processing.
Digital signal processing in the microprocessor results in lower noise
from circuitry components, resulting in a cleaner signal and better
performance under low perfusion conditions. There is also improved
rejection of noise from the patient and environment, due to the
availability of the “true,” unfiltered sensor signal for digital signal
processing.
percent oxygen saturation = x 100
oxyhemoglobin
oxyhemo deoxyhemoglobin
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