Point-of-care end-tidal carbon monoxide reflects severity of hemolysis in sickle cell anemia

Area of Science:

• Biochemistry
• Pediatrics
• Medical Diagnostics

Background:

• Heme catabolism generates carbon monoxide (CO).
• Increased hemolysis in sickle cell anemia (SCA) leads to higher CO production.
• End-tidal CO (ETCO) monitoring offers a non-invasive method to assess CO levels.

Purpose of the Study:

• To evaluate the utility of a portable end-tidal CO (ETCO) monitor for detecting sickle cell anemia (SCA) in children.
• To assess the correlation between ETCO levels and markers of hemolysis in SCA patients.
• To explore ETCO as a potential screening tool for SCA.

Main Methods:

• Breath samples were analyzed using a portable ETCO monitor in 16 children with SCA (ages 5-14) and controls.
• ETCO levels were compared between SCA patients and healthy controls.
• Correlation analysis was performed between ETCO levels and reticulocytosis and bilirubin.

Main Results:

• Children with SCA had significantly higher median ETCO levels (4.35 ppm) compared to controls (0.80 ppm) (P < 0.001).
• An ETCO cutoff of >2.1 ppm demonstrated 93.8% sensitivity and specificity for detecting SCA.
• ETCO levels correlated positively with reticulocytosis and bilirubin, and were lower in children receiving hydroxyurea.

Conclusions:

• Point-of-care ETCO analysis is a sensitive and specific non-invasive method for detecting SCA in children.
• ETCO monitoring can serve as a valuable tool for assessing hemolysis in SCA.
• This method shows potential as a screening test for sickle cell anemia.