[Transcranial Doppler exploration of the brain stem vascularization in neurological pathology].

The hemodynamic alterations in the vertebrobasilar system arteries of 1051 patients are discussed. The aspects revealed by transcranial Doppler are classified as obstructions, stenoses and atherosclerotic type lesions. Their prevalence compared with the clinical diagnosis or through other investigation methods is commented upon, an etiological classification of such alterations in hemodynamics in the basilar and vertebral arteries being attempted. Multiple defect theory seems to be, in such cases as well, the clinical expression accounting for the pathogenic phenomena and response to drug tests.