Reflectance oximetry is heavily utilized for monitoring which venous oxygen saturations?

Reflectance oximetry is heavily utilized for monitoring which venous oxygen saturations?

• A. SvO2
• B. SaO2
• C. SpO2
• D. PaO2

Answer: (A)

Reflectance oximetry gauges tissue oxygenation by near-infrared light, and in tissues the non-pulsatile signal comes mainly from venous blood because there’s more venous volume there and it changes more slowly. That makes the readout a reflection of venous oxygen saturation rather than arterial. SvO2 represents the oxygen saturation of mixed venous blood, so reflectance oximetry is most closely aligned with monitoring SvO2. Arterial saturations (SpO2, SaO2) and arterial oxygen tension (PaO2) come from arterial blood and are measured differently, so they aren’t what this method primarily yields.

Reflectance oximetry gauges tissue oxygenation by near-infrared light, and in tissues the non-pulsatile signal comes mainly from venous blood because there’s more venous volume there and it changes more slowly. That makes the readout a reflection of venous oxygen saturation rather than arterial. SvO2 represents the oxygen saturation of mixed venous blood, so reflectance oximetry is most closely aligned with monitoring SvO2. Arterial saturations (SpO2, SaO2) and arterial oxygen tension (PaO2) come from arterial blood and are measured differently, so they aren’t what this method primarily yields.