Which of the following is false about transcutaneous blood gas monitoring?

a. Transcutaneous blood gas monitoring pro-vides a reasonable estimate of PaO2 and PaCO2.
b. Transcutaneous blood gas monitoring is most accurate when used with older adults.
c. Accurate estimates of transcutaneous blood gases are difficult in patients with shock.
d. Transcutaneous blood gas monitors use heated skin electrodes to arterialize the blood.

ANS: B
In terms of age, the younger the patient, the better the agreement between the PaO2 and PtcO2.