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Clinical Trial Summary

This study will 1) Evaluate the prevalence of elevated (conditional or abnormal) transcranial Doppler (TCD) velocities in a cross-sectional analysis of children with Sickle Cell Anemia (SCA) living in Tanzania; 2) Obtain longitudinal data on TCD velocities in this population; and 3) Measure the effects of hydroxyurea therapy on TCD velocities and associated primary stroke risk.


Clinical Trial Description

Stroke Prevention with Hydroxyurea Enabled through Research and Education (SPHERE) is a single-center prospective phase 2 pilot study. It will enroll a convenience sample of children with SCA, obtain cross-sectional baseline data at enrolment, and follow them as a prospective cohort for a period of 24 months. The cohort will be divided into two arms based on the initial screening TCD result: 1) those who have a normal (less than 170 cm/sec time averaged mean velocity (TAMV)) initial screening TCD and will be an observation/control cohort; and 2) those who have an elevated initial screening TCD (either conditional (170-199 cm/sec) or abnormal (greater than or equal to 200 cm/sec) TAMV) and will be a treatment cohort that receives open-label hydroxyurea therapy as per the dosing and administration schedule. Those who are found to have a normal TCD at enrolment and are part of the observation/control cohort will undergo repeat TCD 12 months after enrolment. If the TCD at 12 months has changed to an elevated velocity (conditional or abnormal), the study participant can begin study treatment, but will not be included in the primary endpoint analysis. The primary hypothesis is after 12 months of hydroxyurea therapy, children with conditional TCD velocities will achieve a mean decrease of >15cm/sec from their baseline TCD TAMV. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03948867
Study type Interventional
Source Children's Hospital Medical Center, Cincinnati
Contact
Status Enrolling by invitation
Phase Phase 2
Start date April 24, 2019
Completion date December 31, 2025

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