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Blood, 15 May 2004, Vol. 103, No. 10, pp. 3689-3694.
Prepublished online as a Blood First Edition Paper on January 29, 2004; DOI 10.1182/blood-2003-08-2733.

Submitted August 19, 2003
Accepted January 16, 2004
Stroke and Conversion to High Risk in Children Screened with Transcranial Doppler Ultrasound during the STOP Study
Robert J Adams*, Donald J Brambilla, Suzanne Granger, Dianne Gallagher, Elliott Vichinsky, Miguel Abboud, Charles H Pegelow, Gerald Woods, Elizabeth Rohde, Fenwick T Nichols, Anne Jones, Judith P Luden, Latonya Bowman, Susan S Hagner, Knashawn H Morales, and E S Roach
Neurology, Medical College of Georgia, Augusta, GA, USA
New England Research Institutes, Watertown, MA, USA
Hematology/Oncology, Children's Hospital of Oakland, Oakland, CA, USA
Hematology/Oncology, Medical University of South Carolina, Charleston, SC, USA
Sickle Cell, University of Miami School of Medicine, Miami, FL, USA
Hematology/Oncology, Children's Mercy Hospital, Kansas City, MO, USA
Neurology, Wake Forest University School of Medicine, Winston Salem, NC, USA
* Corresponding author; email: rjadams{at}mail.mcg.edu.
The Stroke Prevention Trial in Sickle Cell Anemia (STOP) was a randomized multi-center controlled trial comparing prophylactic blood transfusion to standard care in SCD children aged 2 to 16 years selected for high stroke risk by TCD. Over two thousand children were screened with TCD to identify the 130 high-risk children who entered the randomized trial. A total of 5,613 TCD studies from 2,324 children were evaluated. We also collected information on stroke. We describe the changes in TCD with repeat testing and report the outcome without transfusion in the STOP screened cohort. Risk of stroke was higher with abnormal TCD than with normal or conditional TCD (p<.001) or inadequate TCD (p=.002), and risk with conditional TCD was higher than with normal TCD (p<.001). Repeat TCD in 1215 children showed that 9.4% of children became abnormal during observation. Younger patients and those with higher initial flow velocities were most likely to convert to abnormal. Screening in STOP confirmed the predictive value of TCD for stroke. Substantial differences in probability of conversion to abnormal TCD were observed, with younger children and those with higher velocity more likely to have an abnormal TCD with re-screening.

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