Mindray DPM 1 Manuel de l'opérateur télécharger pdf (Page 154)

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11.3.4 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:

 Incorrect sensor application or use;

 Placement of a sensor on the same extremity with a blood pressure cuff, arterial catheter, or

intravascular line;

 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);

 Excessive patient motion;

 Venous pulsations;

 Intravascular dyes such as indocyanine green or methylene blue;

 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:

 The sensor is too tight;

 A blood pressure cuff is inflated on the same extremity as the one with a SpO2 sensor

attached;

 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.

 Verify that the sensor is properly and securely applied.

 Move the sensor to a less active site.

 Use an adhesive sensor that tolerates some patient motion.

 Use a new sensor with fresh adhesive backing.

If poor perfusion affects performance, consider using the Oxisensor R-15 sensor; it obtains

measurements from the nasal septal anterior ethmoid artery, an artery supplied by the internal

carotid. This sensor may obtain measurements when peripheral perfusion is relatively poor. For

low peripheral perfusion, consider using the Nellcor RS-10 sensor, which is applied to the

forehead or temple. These are sites that may be spared during peripheral vasoconstriction.

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Mindray DPM 1 Manuel de l'opérateur Page 154