Correctly Establishing and Interpreting Oxygenation Status in Sickle Cell Disease

Area of Science:

• Hematology
• Pulmonary Medicine
• Clinical Chemistry

Background:

• Hypoxemia and hypoxia are critical to sickle cell disease (SCD) pathophysiology, morbidity, and mortality.
• Optimizing oxygenation is a key clinical management goal in SCD.
• Pulse oximetry is the standard for hypoxemia screening but can be inaccurate in SCD.

Purpose of the Study:

• To highlight the limitations of pulse oximetry in assessing arterial oxygen saturation in SCD.
• To clarify the distinct meanings and interpretations of various oxygenation parameters (O2Sat, SO2, FO2Hb).
• To emphasize the importance of accurate oxygenation assessment for quality, equitable SCD care.

Main Methods:

• Review of parameters determining blood and tissue oxygen concentration.
• Discussion of laboratory method performance characteristics.
• Analysis of literature on noninvasive versus invasive oxygenation measurements in SCD.

Main Results:

• Pulse oximetry may inaccurately reflect arterial saturation in SCD, leading to occult hypoxemia.
• Oxygen saturation measurements (O2Sat, SO2, FO2Hb) are not interchangeable in SCD due to factors like anemia and dyshemoglobins.
• Accurate interpretation requires considering patient-specific factors and appropriate laboratory testing.

Conclusions:

• Correctly establishing and interpreting oxygenation parameters is vital for high-quality SCD care.
• Accurate assessment can help counteract health disparities experienced by individuals with SCD.
• Understanding distinct oxygenation measures prevents misdiagnosis and mismanagement, improving tissue oxygenation.