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Vascular Geometry Drives Stroke Risk in Sickle Cell Disease.

Weiqiang Liu1, Christian Kassasseya2,3, Lazaros Papamanolis1,4

  • 1Inria, Research Center Saclay Île-De-France, Palaiseau, France.

American Journal of Hematology
|January 28, 2026
PubMed
Summary
This summary is machine-generated.

Sickle cell disease (SCD) stroke risk is linked to high blood flow velocity in brain arteries, not just anemia. In silico models show young SCD patients experience dangerous velocities due to vessel shape and flow, promoting cerebral vasculopathy.

Keywords:
cerebral hemodynamicscerebral vasculopathycomputational modelingsickle cell diseasestroke riskvascular geometry

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Area of Science:

  • Neurology
  • Pediatrics
  • Biomedical Engineering

Background:

  • Sickle cell disease (SCD) is a primary cause of stroke in children and young adults.
  • Cerebral vasculopathy (CV), linked to elevated intracranial arterial blood velocity, is a major contributor to SCD-related stroke.
  • Understanding the hemodynamics of CV is crucial for predicting and preventing stroke in SCD patients.

Purpose of the Study:

  • To investigate the relationship between hemoglobin levels and intracranial blood velocities in SCD patients.
  • To identify factors beyond anemia that contribute to elevated blood velocity.
  • To analyze flow anomalies and their role in CV progression.

Main Methods:

  • Analysis of biological and transcranial Doppler data from pediatric and adult SCD patients.
  • Development of an image-based in silico modeling approach to simulate blood flow.
  • Simulation of blood flow in key cerebral arteries (internal carotid, anterior cerebral, middle cerebral) across different age groups.

Main Results:

  • Anemia alone does not fully explain elevated velocities; no significant correlation was found in children under five.
  • In silico models showed young SCD patients reach pathological velocities at physiological flow rates, unlike adults.
  • Pathological velocities and complex flow patterns were observed in distal internal carotid arteries, correlating with stenosis development.

Conclusions:

  • Hemodynamic factors like high flow rates, small arterial diameter, and vessel curvature significantly contribute to pathological velocities in young SCD patients.
  • These hemodynamic forces likely cause endothelial damage, promoting CV progression and stroke risk.
  • Findings support improved predictive models and early interventions for SCD-related stroke prevention.