In which of the following patients would transcutaneous blood gas monitoring most likely pro-vide inaccurate or erroneous results?
a. Newborn infant with respiratory distress syndrome (RDS)
b. Patient with hypoxemia
c. Patient with a hyperpyrexia
d. Patient in hypovolemic shock
ANS: D
This is because accurate transcutaneous measures require adequate skin perfusion. Low cardiac output, shock, and dehydration all cause peripheral vasoconstriction and impair capillary flow, which lowers the PtcO2 level.
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