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Related Experiment Videos

Sickle cell disease: primary stroke prevention.

Mehari Gebreyohanns1, Robert J Adams

  • 1Department of Neurology, Medical College of Georgia, Augusta, 30912, USA.

CNS Spectrums
|May 27, 2004
PubMed
Summary

Stroke is a common complication of sickle cell disease (SCD). Transcranial Doppler ultrasound (TCD) screening and chronic transfusions significantly reduce stroke risk in children with SCD.

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Area of Science:

  • Neurology
  • Hematology
  • Pediatrics

Background:

  • Stroke is a frequent and serious complication of sickle cell disease (SCD), impacting both children and adults.
  • Intracranial artery stenosis or occlusion, leading to moyamoya or infarction, is a common cause of clinically evident stroke in SCD.
  • Silent cerebrovascular disease, though often unrecognized, is linked to cognitive and learning impairments.

Purpose of the Study:

  • To evaluate the effectiveness of transcranial Doppler ultrasound (TCD) screening and chronic blood transfusions for primary stroke prevention in children with SCD.
  • To assess the risk of clinical stroke associated with silent brain lesions detected by magnetic resonance imaging (MRI) in children with SCD.

Main Methods:

  • A randomized clinical trial screened over 2,000 young children with SCD using TCD ultrasound to identify elevated blood flow velocities indicating high stroke risk.
  • Children identified as high-risk were randomized to either standard care or chronic transfusion therapy.
  • Silent brain lesions on MRI were assessed for their association with future clinical stroke risk.

Main Results:

  • Children receiving standard care had a 10% annual stroke risk, which was reduced by over 90% with chronic transfusions.
  • Silent brain lesions on MRI are associated with an approximate 1.5% annual risk of clinical stroke.
  • TCD screening and transfusion represent the only proven primary stroke prevention strategy in SCD tested in a randomized controlled trial.

Conclusions:

  • Chronic blood transfusion therapy, guided by TCD screening, is highly effective in preventing clinical stroke in children with SCD.
  • Further research and broader implementation of TCD screening are crucial for reducing stroke incidence in children with SCD.
  • Ongoing trials are investigating interventions for nocturnal hypoxemia and exploring other potential preventive agents like hydroxyurea.

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