A simple Doppler test for haemodynamically significant carotid artery disease

Area of Science:

• Vascular Ultrasound
• Neurology
• Medical Imaging

Background:

• Carotid atherosclerosis is a significant risk factor for cerebrovascular disease.
• Accurate non-invasive assessment of carotid stenosis is crucial for patient management.

Purpose of the Study:

• To evaluate the efficacy of directional Doppler velocimetry in assessing carotid atherosclerosis.
• To compare Doppler-derived arterial waveform pulsatility indices with arteriography in detecting internal carotid artery stenosis.

Main Methods:

• A 10 MHz directional Doppler velocimeter was used in 41 patients with cerebrovascular disease.
• Arterial waveform pulsatility indices of the common carotid (CC), temporal (T), supratrochlear (ST), and central retinal artery (CRA) were measured.
• Doppler findings were compared with triplanar arteriograms to detect internal carotid artery stenosis.

Main Results:

• Doppler signal ratios differentiated between <70% and >70% stenosis, and complete occlusion.
• The ST/CC ratio showed high sensitivity (90%) and specificity (93.5%) for internal carotid artery stenosis.
• The T/CC ratio demonstrated high accuracy (96%) for diagnosing external carotid artery stenosis (>70%).

Conclusions:

• Directional Doppler velocimetry, particularly the ST/CC and T/CC ratios, is a sensitive and specific method for assessing carotid atherosclerosis.
• These Doppler ratios are easy to perform using routinely available equipment.
• Doppler velocimetry offers a reliable non-invasive tool for diagnosing carotid artery stenosis in patients with cerebrovascular disease.