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Lessons From the Stroke Prevention Trial in Sickle Cell Anemia (STOP) Study

Medical College of Georgia, Augusta, GA, rjadams{at}neuro.mcg.edu

Stroke is generally uncommon in children, but sickle cell disease is associated with a high risk of stroke in the early years of childhood. Large cerebral arteries, especially the middle cerebral and intracranial internal carotid, develop stenosis that predisposes to ischemic stroke. Noninvasive prediction of risk using transcranial Doppler ultrasonography made it possible to test primary stroke prevention in a clinical trial comparing chronic blood transfusion with standard care. A consortium of 14 clinical centers conducted a randomized clinical trial (Stroke Prevention in Sickle Cell Anemia—the "STOP" study) to test a strategy to prevent first stroke in children with sickle cell disease. Over 2000 children were screened with transcranial Doppler ultrasonography and of these, 130 with elevated blood velocity indicating high risk were enrolled in the trial. Regular red cell transfusions sufficient to reduce the percentage of Hb S gene product from over 90 to less than 30 of total hemoglobin was associated with a marked reduction in stroke. The untreated risk of 10% per year was reduced over 90% with treatment, an effect sufficient to cause early termination of the trial. Although treatment was unblinded, the design included blinded adjudication of possible stroke by a panel of neurologists remote from the study sites. The study led to a Clinical Alert, issued by the National Heart, Lung, and Blood Institute, recommending screening and consideration of treatment in children with sickle cell disease and 2 to 16 years of age who are at risk based on transcranial Doppler ultrasonography, and who have not had stroke. (J Child Neurol 2000;15:344-349).

Journal of Child Neurology, Vol. 15, No. 5, 344-349 (2000)
DOI: 10.1177/088307380001500511


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