Which of the following cause erroneous transcutaneous oxygen (PtcO2) readings? 1. Hypovolemia 2. Hypothermia 3. Septic shock 4. Asthma

a. 1 and 3 c. 1, 2, and 3
b. 1 and 4 d. 2, 3, and 4


ANS: C
Hypovolemia, hypothermia, and septic shock will decrease peripheral perfusion caused by reduc-tions in cardiac output. This can significantly affect the accuracy of PtcO2 measurements. Asth-ma does not necessarily cause a decrease in cardiac output.

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