RT Journal Article SR Electronic T1 Cerebrovascular reactivity assessed by transcranial Doppler ultrasound in sport-related concussion: a systematic review JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 1050 OP 1055 DO 10.1136/bjsports-2014-093901 VO 49 IS 16 A1 Andrew J Gardner A1 Can Ozan Tan A1 Philip N Ainslie A1 Paul van Donkelaar A1 Peter Stanwell A1 Christopher R Levi A1 Grant L Iverson YR 2015 UL http://bjsm.bmj.com/content/49/16/1050.abstract AB Background Traumatic brain injury influences regulation of cerebral blood flow in animal models and in human studies. We reviewed the use of transcranial Doppler ultrasound (US) to monitor cerebrovascular reactivity following sport-related concussion.Review method A narrative and systematic review of articles published in the English language, from December 1982 to October 2013.Data sources Articles were retrieved via numerous databases using relevant key terms. Observational, cohort, correlational, cross-sectional and longitudinal studies were included.Results Three publications met the criteria for inclusion; these provided data from 42 athletes and 33 controls. All three studies reported reductions in cerebrovascular reactivity via transcranial Doppler US.Conclusions These initial results support the use of cerebrovascular reactivity as a research tool for identifying altered neurophysiology and monitoring recovery in adult athletes. Larger cross-sectional, prospective and longitudinal studies are required to understand the sensitivity and prognostic value of cerebrovascular reactivity in sport-related concussion.