Normal PvO2 5.3 kPa — FRCA Primary MCQ

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ModeratePhysiology - CardiovascularNormal PvO2 5.3 kPaFRCA Primary

The normal mixed venous PO2 (PvO2) is approximately:

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Correct answer: D — 5.3 kPa (40 mmHg)

Normal PvO2 from the pulmonary artery (true mixed venous) is approximately 5.3 kPa (40 mmHg) corresponding to SvO2 of approximately 75%. A PvO2 <4 kPa (<30 mmHg / SvO2 <65%) suggests inadequate oxygen delivery relative to consumption (e.g. low CO / anaemia / increased demand).

Reference: Power Kam 2018 Principles of Physiology for the Anaesthetist