Welch Allyn 4200B, Directions For Use Manual, Page: 43 / 74

7
35
Pulse Oximetry (Sp0
2
)
Factors that may degrade the performance of the pulse oximeter:
To take an SpO
2
measurement:
If blood pressure measurement is occurring simultaneously, place the finger sensor on
the limb opposite the one with the blood pressure cuff.
1. Insert the patient’s finger completely into the sensor; the thumb is specifically not
recommended for use with the finger clip sensor.
The pulse signal bar graph illuminates, indicating the patient’s pulse at the sensor site.
The sensor takes approximately 10 seconds to determine the initial SpO
2
% value and
pulse rate. When the initial values are determined, they are shown in the SpO
2
display and the pulse rate display, respectively. If the accuracy of any measurement
does not seem reasonable, first use an alternate means to check the patient’s vital
signs and then check the Spot Vital Signs for proper functioning.
Spot Vital Signs measures a patient’s SpO
2
for up to 10 minutes. After 10 minutes,
Spot Vital Signs displays a C9 error code and beeps twice. This error code means that
the use has exceeded the 10-minute time limit.To clear the error code, disconnect the
sensor from Spot Vital Signs and then re-attach it or press the
Next Patient/Clear/
Cancel button.
2. Check sensor sites periodically to assess circulation, sensor positioning, and skin
sensitivity.
3. Remove the sensor from the patient. The device continues to display the last SpO
2
reading.
• Excessive ambient light • Sensor not at heart level • Excessive motion
• Anemia or low hemoglobin
concentrations • Fingernail polish (if finger sensor
is used) • Arterial catheters, blood pressure,
and infusion lines, etc.
• Moisture in the sensor • Cardiovascular dyes • Improperly attached sensor
• Incorrect sensor for patient • Electrosurgical interference • Poor patient perfusion
• Venous pulsations
WARNING Tissue damage can be caused by incorrect application or duration of
use of an SpO
2
sensor. Inspect the sensor site as directed in the sensor
Directions for Use.
WARNING Do not use a damaged sensor or pulse oximetry cable or a sensor
with exposed optical components.