SpO
2
Monitoring
12-27
12.4.4 Measurement Limitations
If the accuracy of any measurement does not seem reasonable, first check the
patient’s vital signs by an alternate method. Then check the instrument for proper
function.
Inaccurate measurements may be caused by:
îš„ Incorrect sensor application or use;
îš„ Placement of a sensor on the same extremity with a blood pressure cuff, arterial
catheter, or intravascular line;
îš„ Exposure to excessive illumination, such as surgical lamps (especially ones
with a xenon light source), bilirubin lamps, fluorescent lights, infrared heating
lamps, or direct sunlight (exposure to excessive illumination can be corrected
by covering the sensor with a dark material);
îš„ Excessive patient motion;
îš„ Venous pulsations;
îš„ Intravascular dyes such as indocyanine green or methylene blue;
îš„ Defibrillation;
Other physiological conditions or medical procedures that may interfere with the
monitor’s measurements include significant levels of dysfunctional hemoglobin, low
perfusion, and dark pigment.
Loss of pulse signal can occur in the following situations:
îš„ The sensor is too tight;
îš„ A blood pressure cuff is inflated on the same extremity as the one with a SpO2
sensor attached;
îš„ There is arterial occlusion proximal to the sensor.
Select an appropriate sensor, apply it as directed, and observe all warnings and
cautions presented in the directions for use accompanying the sensor. Clean and
remove any substances such as nail polish from the application site. Periodically
check to ensure that the sensor remains properly positioned on the patient.
If patient movement presents a problem, try one or more of the following remedies
to correct the problem.
îš„ Verify that the sensor is properly and securely applied.
îš„ Move the sensor to a less active site.
îš„ Use an adhesive sensor that tolerates some patient motion.
îš„ Use a new sensor with fresh adhesive backing.
To Next Page
Loading...
Need help?
General
