Effect of various head and neck positions on vertebral artery blood flow

Manual Therapy and Cervical Arterial Dysfunction, Directions for the Future: A Clinical Perspective

“…Other studies, however, have found no change in blood fl ow [29][30][31][32] . Some authors have used the results of studies demonstrating a reduction in blood fl ow to support the validity of screening tests; i.e., one tests to assess blood fl ow changes, these studies demonstrate that rotation changes blood fl ow; therefore, the test is valid.…”

The effect of end-range cervical rotation on vertebral and internal carotid arterial blood flow and cerebral inflow: A sub analysis of an MRI study

“…Attempts to quantify blood flow changes in the VAs on neck rotation, with the premise that large changes in flow might indicate greater biomechanical stress on the artery, have yielded conflicting findings. Some studies showing reduced flow on contralateral rotation, some with ipsilateral and others no change in either direction, sometimes despite positive VBI tests (Thiel, Wallace et al 1994, Haynes 1996, Rivett, Sharples et al 1999, Haynes and Milne 2001 Sakaguchi, Kitagawa et al 2003, Zaina, Grant et al 2003, Mitchell, Keene et al 2004, Sultan, Hartshorne et al 2009, Bowler, Shamley et al 2011, Quesnele, Triano et al 2014. Of the few studies that have examined blood flow in the ICAs, similarly conflicting findings have emerged (Sultan, Hartshorne et al 2009, Bowler, Shamley et al 2011.…”

Vertebral artery testing and differential diagnosis in dizzy patients

“…Vestibulogenic disorders such as benign paroxysmal positional vertigo (BPPV) frequently cause dizziness; however, other medical conditions such as vertebrobasilar insufficiency (VBI) can also cause dizziness [7][8][9][10][11][12][13][14][15]. VBI is an uncommon but serious medical condition caused by a disruption in the vertebrobasilar arterial system [16][17][18].…”