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The introduction of surgical techniques improving blood flow through the extracranial blood vessels supplying the brain has turned attention toward the development of applicable methods of diagnosing disturbed cerebral circulation. There is an urgent need for more precise diagnostic tests, particularly those which may detect early and reversible central nervous systems (CNS) damage. Of equal importance to the surgeon is the need for the development of an objective method for assessing the results of surgical procedures directed towards improvement of central blood flow. Accurate evaluation of symptoms referable to organic disturbance of cerebral circulation may be difficult, because of the similarity to certain functional disorders. Quantitative objective methods of testing along with prolonged follow-up of these patients will permit the assessment of value of vertebral artery surgery. This article reports the results of a new test of the performance of the CNS, as it was used on 55 cases chosen
Creel W, Powers S, Boomsliter PC. Tonal Sensation as a Criterion of Vertebral Artery Insufficiency. Arch Surg. 1969;98(3):309–312. doi:10.1001/archsurg.1969.01340090085013
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