Which statement best describes the interpretation when SvO2/ScvO2 is 50-70%?

Which statement best describes the interpretation when SvO2/ScvO2 is 50-70%?

• A. VO2 decreasing or DO2 increasing
• B. VO2 increasing or DO2 decreasing
• C. Lactic acidosis
• D. Cellular death

Answer: (B)

SvO2/ScvO2 shows the balance between oxygen delivery to the tissues (DO2) and oxygen consumption by the tissues (VO2). When this value falls into a lower range like 50–70%, it means the tissues are extracting more oxygen than usual, because either demand has risen or delivery has fallen. The best interpretation is that VO2 is increasing or DO2 is decreasing, which leaves less oxygen in the venous blood returning to the heart. Lactic acidosis or cellular death aren’t the direct readings you infer from this single value. They may occur with prolonged imbalance, but they’re downstream consequences rather than the immediate interpretation of the SvO2/ScvO2 reading.

SvO2/ScvO2 shows the balance between oxygen delivery to the tissues (DO2) and oxygen consumption by the tissues (VO2). When this value falls into a lower range like 50–70%, it means the tissues are extracting more oxygen than usual, because either demand has risen or delivery has fallen. The best interpretation is that VO2 is increasing or DO2 is decreasing, which leaves less oxygen in the venous blood returning to the heart.

Lactic acidosis or cellular death aren’t the direct readings you infer from this single value. They may occur with prolonged imbalance, but they’re downstream consequences rather than the immediate interpretation of the SvO2/ScvO2 reading.