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A simple Doppler test for haemodynamically significant carotid artery disease
Insights
Directional Doppler velocimetry effectively detects carotid atherosclerosis. Specific ratios like supratrochlear/common carotid accurately diagnose internal carotid artery stenosis.
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.
Abstract:
A 10 MHz directional Doppler velocimeter was used to assess carotid atherosclerosis in 41 patients with cerebro-vascular disease. There were 30 men and 11 women with a mean age of 58 years. The arterial waveform pulsatility indices of the common carotid (CC), temporal (T), supratrochlear (ST), and central retinal artery (CRA) were compared with triplanar arteriograms in detecting internal carotid artery stenosis. The results were that Doppler signal ratios were able to differentiate less than 70% from greater than 70% stenosis and complete occlusion. For the diagnosis of internal carotid stenosis the ratio ST/CC had a sensitivity of 90%, a specificity of 93.5% and an accuracy of 93%. The CRA/CC ratio showed a sensitivity of 90% specificity of 72% and accuracy of 76%, and central retinal artery signals were difficult to detect. The T/CC ratio diagnosed external carotid artery stenosis of greater than 70% with a sensitivity of 90%, a specificity of 87% and an accuracy of 96%. The ST/CC and T/CC ratios were easy to perform, and employed routinely available Doppler velocimeters.