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TCD in sickle cell disease: an important and useful test
1Medical College of Georgia, 1429 Harper St., HF 1154, Augusta, GA 30912-3235, USA. rjadams@mail.mcg.edu
Pediatric Radiology
|February 11, 2005
Summary
Transcranial Doppler (TCD) screening effectively identifies children with sickle cell disease (SCD) at high risk for stroke. Early detection and intervention with blood transfusions significantly reduce stroke incidence in these young patients.
Area of Science:
- Neurology
- Pediatrics
- Hematology
Background:
- Sickle cell disease (SCD) presents a significant risk of childhood stroke.
- Secondary stroke risk is substantially reduced by chronic blood transfusions.
Purpose of the Study:
- To evaluate the efficacy of transcranial Doppler (TCD) ultrasound in primary stroke prevention for children with SCD.
- To establish TCD as a screening tool for identifying high-risk individuals.
Main Methods:
- The Stroke Prevention Trial in Sickle Cell Anemia (STOP) randomized children with SCD.
- Transcranial Doppler (TCD) ultrasound assessed blood flow velocities in cerebral arteries (MCA, ICA).
- Velocity readings classified TCD results as normal, conditional, abnormal, or inadequate to stratify stroke risk.
Main Results:
- Children with abnormal TCD results randomized to monthly blood transfusions experienced significantly fewer strokes (1 vs. 10) compared to the control group.
- Transfused patients also reported fewer medical complications.
- TCD screening is recommended starting at 24 months, repeated every 6-12 months.
Conclusions:
- Transcranial Doppler (TCD) is the current gold standard for primary stroke prevention in pediatric SCD patients.
- Transcranial Doppler imaging (TCDI) offers comparable predictive value with potentially easier application.
- While not predicting all strokes, TCD and TCDI enable timely intervention, reducing first-time strokes in high-risk children.