Endothelial Function and Vascular Properties in Children with Sickle Cell Disease

Area of Science:

• Vascular biology
• Pediatric hematology
• Cardiovascular health

Background:

• Sickle cell disease (SCD) causes vaso-occlusion and pain crises.
• Adults with SCD exhibit increased arterial stiffness and reduced flow-mediated dilation (FMD).
• Endothelial dysfunction, linked to nitric oxide impairment, contributes to vascular issues in SCD.

Purpose of the Study:

• To evaluate carotid and brachial artery vascular properties in children with SCD.
• To compare vascular parameters in pediatric SCD patients with a healthy control group.

Main Methods:

• Prospective enrollment of 30 children with SCD (mean age 12.3 years) and 30 matched healthy controls.
• Assessment of carotid intima-media thickness (IMT), cross-sectional compliance (CSC), cross-sectional distensibility (CSD), diastolic wall stress (DWS), incremental elastic modulus (Einc), and FMD.
• Comparison of vascular measurements between the SCD and control groups.

Main Results:

• No significant difference in FMD between pediatric SCD patients and controls (8.2% vs. 9.3%, P=0.15).
• Significantly elevated CSD in the SCD group (0.96 vs. 0.59, P=0.0002).
• Significantly lower DWS and Einc in the SCD group compared to controls.

Conclusions:

• Children with SCD do not display significant endothelial dysfunction or arterial stiffness.
• These vascular changes may manifest later in life, correlating with disease severity and duration.
• Early vascular alterations in SCD might not be apparent in childhood.