Abnormal Lower Extremity Hemodynamics at Doppler US in Children with Sickle Cell Anemia

Area of Science:

• Pediatric vascular health
• Hematology
• Medical imaging

Background:

• Children with sickle cell anemia (SCA) are prone to leg ulcers.
• The physiological mechanisms behind these ulcers are not fully understood.
• This knowledge gap impedes the development of preventative treatments.

Purpose of the Study:

• To investigate potential occlusive arterial disease in the lower limbs of children with SCA.
• To assess for abnormal hemodynamics in the peripheral arteries of these children.

Main Methods:

• A prospective cross-sectional study compared children with SCA to healthy controls.
• Ultrasound (B-mode, color Doppler, spectral Doppler) evaluated tibial arteries.
• Ankle-brachial index (ABI) was also measured.

Main Results:

• Children with SCA exhibited significantly higher peak systolic velocities, end-diastolic velocities, and blood volume flow in tibial arteries compared to controls.
• Lower resistive and pulsatility index values were noted in SCA patients.
• Monophasic spectral patterns were unique to the SCA group.
• Ankle-brachial index values were within normal ranges for both groups.

Conclusions:

• Children with sickle cell anemia demonstrate altered peripheral hemodynamic characteristics in their lower limbs.
• No evidence of occlusive peripheral artery disease was detected in the studied population.
• Findings suggest a basis for abnormal vascular function contributing to leg ulceration in pediatric SCA.