A transcutaneous PtcO2 reading is most reliable in which patient condition?

A transcutaneous PtcO2 reading is most reliable in which patient condition?

• A. Infant respiratory distress syndrome
• B. Acute respiratory distress syndrome
• C. Bronchopulmonary dysplasia
• D. Neonatal pneumonia

Answer: (A)

Transcutaneous PtcO2 readings depend on good skin perfusion; if perfusion is poor, the sensor no longer reflects arterial oxygen tension reliably. Conditions that cause edema, vascular instability, or vasoconstriction disrupt this relationship, making the reading less accurate. Among the neonatal respiratory conditions listed, infant respiratory distress syndrome tends to have more stable peripheral perfusion after stabilization, with less edema and vascular fluctuation compared with ARDS, bronchopulmonary dysplasia, or pneumonia. That stability makes PtcO2 readings most reliable in this scenario.

Transcutaneous PtcO2 readings depend on good skin perfusion; if perfusion is poor, the sensor no longer reflects arterial oxygen tension reliably. Conditions that cause edema, vascular instability, or vasoconstriction disrupt this relationship, making the reading less accurate. Among the neonatal respiratory conditions listed, infant respiratory distress syndrome tends to have more stable peripheral perfusion after stabilization, with less edema and vascular fluctuation compared with ARDS, bronchopulmonary dysplasia, or pneumonia. That stability makes PtcO2 readings most reliable in this scenario.