Carotid artery velocity patterns in normal and stenotic vessels

Area of Science:

• Vascular Ultrasound
• Doppler Echocardiography
• Cerebrovascular Imaging

Background:

• Carotid artery stenosis is a significant risk factor for stroke.
• Accurate non-invasive assessment of internal carotid artery (ICA) stenosis is crucial for patient management.
• Duplex scanning combines B-mode imaging and Doppler ultrasound for comprehensive carotid evaluation.

Purpose of the Study:

• To evaluate the accuracy of duplex scanning in quantifying internal carotid artery (ICA) stenosis.
• To determine the diagnostic utility of the velocity ratio (VICA/VCCA) in identifying significant carotid artery narrowing.

Main Methods:

• Duplex scanning was performed on 39 patients with prior angiography and 15 healthy controls.
• Real-time B-mode imaging and pulsed Doppler flow velocity measurements were utilized.
• The ratio of mean peak systolic velocity in the ICA to the common carotid artery (CCA) (VICA/VCCA) was calculated.

Main Results:

• A VICA/VCCA ratio below 0.8 indicated normal arteries (36 vessels).
• A VICA/VCCA ratio above 1.5 identified high-grade stenoses (≥60% diameter reduction) in 21 vessels.
• Sixty-one percent of vessels with 10-55% stenosis had a velocity ratio between 0.8 and 1.5, with only 10% of stenotic ICAs misclassified as normal.

Conclusions:

• The VICA/VCCA ratio derived from duplex scanning is a reliable indicator of internal carotid artery (ICA) stenosis severity.
• Duplex scanning offers a valuable non-invasive tool for assessing cerebrovascular disease and guiding treatment decisions.