Transcranial Doppler screening in sickle cell disease: The implications of using peak systolic criteria

Figure 1 Example of time averaged mean maximum velocity measurement in the left middle cerebral artery. The green line represents the cutoff for PSV (200 cm/s) which was considered conditional requiring increased surveillance. The blue line represents the cutoff for TAMV (170 cm/s) which was considered conditional requiring increased surveillance. This study did not result in a conditional interpretation by either criteria (TAMV = 126 cm/s and PSV = 185 cm/s). MCA: Middle cerebral artery; TAMV: Time average maximum mean velocity; PSV: Peak systolic velocity.