TCD velocities in HbSC disease. TAMMV, timed averaged mean of maximum velocity; mRMCA, mid-right middle cerebral artery; RACA, right anterior cerebral artery, rPCA, right posterior cerebral artery; mLMCA, mid-left middle cerebral artery; LACA, left anterior cerebral artery, LPCA, left posterior cerebral artery; HbSC, hemoglobin SC; TCD, transcranial Doppler ultrasound.