RETROGRADE VERTEBRAL ARTERY BLOOD FLOW. A NORMAL PHENOMENON.
D000792:Angiography; D002560:Cerebrovascular Circulation; D005853:Geriatrics; D006439:Hemodynamics; D006801:Humans; D007511:Ischemia; D014652:Vascular Diseases; D014711:Vertebral Artery
ANGIOGRAPHY; CEREBROVASCULAR CIRCULATION; GERIATRICS; ISCHEMIA; VASCULAR DISEASES; VERTEBRAL ARTERY