Vascular Medicine
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Оглавление
Thomas Zeller. Vascular Medicine
Отрывок из книги
Vascular Medicine
Therapy and Practice
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The head of the basilar artery is a site of predilection for arteriosclerotic lesions. There are as yet no validated Doppler or duplex ultrasound criteria for grading stenoses of the basilar artery. The critical velocity from which a > 50% stenosis must be assumed to be present is 140 cm/s (Baumgartner et al. 1999), but suspicion should already be raised at flow velocities of 100–120 cm/s. The criteria mentioned in connection with the middle cerebral artery can also be used as an approximation.
Basilar artery hypoplasia must be assumed when there is extracranial evidence of bilateral vertebral artery hypoplasia, particularly if the total diameter of the two vertebral arteries is less than 5 mm. Occlusion of the basilar artery (basilar thrombosis) must be assumed with:
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