The authors propose two signs for detecting moderate (about 50% reduction of the arterial lumen) stenosis at the origin of the internal carotid (IC) using the Doppler technique: (1) the 'arch-pattern,' drawn on the systolic and diastolic blood flow velocity enveloping curve when slowly translating the probe from the common carotid (CC) to the end of the accessible part of the IC; (2) The 'proximo-distal carotidian ratio,' the latter being pathological if below 1. A large scale confrontation with angiography is still necessary to validate them.
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