“Rik” Kranenburg HA, Tyer R, Schmitt M , et al. - In a systematic review of the 1,453 recognized studies, 31 were involved, including 2,254 individuals in order to examine the impact of craniocervical positions and movements on hemodynamic parameters (blood flow velocity and/or volume) of cervical and craniocervical arteries. During maximal rotation (n = 16), most studies discussed no important hemodynamic variations. A notable reduction in hemodynamics was recognized for the vertebral artery, along with a hemodynamic reduction in the position of maximum rotation (n = 8) and combined movement of maximum extension and maximum rotation (n = 4). For the internal carotid and intracranial arteries, a comparable pattern of reduced hemodynamics was also discovered. Three studies targeted on high-velocity thrust positioning and movement. None of the studies listed hemodynamic variations. The synthesized data propose that in the major proportion of individuals, most positions and movements of the craniocervical region do not impact blood flow. Therefore, the findings of this systematic review infer that craniocervical positioning may not change blood flow as much as formerly anticipated.