Research Article

Vertebral artery occlusion and oral contraceptives.

Br Med J 1976; 1 doi: (Published 28 February 1976) Cite this as: Br Med J 1976;1:487
  1. E Ask-Upmark,
  2. E R Bickerstaff


    If vertebral artery occlusion occurs in degenerative arterial disease it is almost invariably left-sided, but in vertebral artery deficiency syndromes associated with oral contraceptives a striking preponderance of right-sided involvement has been shown. This observation adds support to the view that causes other than changes in the wall of the vessel at the site of occlusion must be sought as an explanation of the occlusion.