During calibration of a transcutaneous monitor the respiratory therapist notices a signal drift. The respiratory therapist should do which of the following?
a. Increase the probe temperature.
b. Replace the monitor and call for repair.
c. Add more electrolyte gel to the patient's skin.
d. Change the electrolyte and sensor's mem-brane.
ANS: D
A signal drift on a transcutaneous monitor should be addressed by changing the electrode and sensor's membrane. The electrode and the sensor's membrane should be changed weekly due to the evaporation of the electrolyte solution caused by the heating of the electrode. Increasing the probe temperature may cause patient burns if it is over 45° C. The signal drift does not necessari-ly mean that the monitor itself needs to be taken out of service. Adding more gel to the patient's skin will help with gas diffusion during measurement only.
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