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[Analysis using transcranial Doppler of hemodynamic consequences in 58 severe obstructions of the internal carotid artery. Preliminary results].

The authors have analyzed by transcranial pulsed Doppler 50 patients with one or two obstructions of the internal carotid artery, divided in three groups: 19 tight stenoses, 23 obstructions and 8 bilateral tight stenoses. The haemodynamic consequences of these carotid obstructions was evaluated from the results of velocity in the intracerebral arteries, the resistance index and the pulsatility compared to a reference artery (PTI). The PTI seems the most sensitive. Compared with the resistance index, it permits to better define the patients prone to be the victims of a haemodynamic cerebro-vascular accident, and seems indicated before carotid surgery is contemplated.