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Ultrasonic arteriography: implications in patient management
Insights
Noninvasive ultrasonic arteriography accurately estimates carotid artery stenosis. This method correctly categorized 83% of arteries, showing high accuracy for detecting significant 50%-99% diameter reductions.
Area of Science:
- Vascular Surgery
- Diagnostic Imaging
- Cardiovascular Ultrasound
Background:
- Carotid artery stenosis is a significant risk factor for stroke.
- Accurate noninvasive methods are crucial for assessing carotid bifurcations.
- Contrast arteriography is the gold standard but is invasive.
Purpose of the Study:
- To evaluate the accuracy of the Hokanson Ultrasonic Arteriograph in estimating carotid artery stenosis.
- To compare noninvasive ultrasonic measurements with contrast arteriography findings.
Main Methods:
- Forty-six carotid bifurcations were studied using the Hokanson Ultrasonic Arteriograph.
- Internal carotid arteries were categorized based on Doppler signal and oscilloscopic image for percent diameter reduction.
- Results were compared to findings from contrast arteriograms interpreted by a blinded vascular radiologist.
Main Results:
- Overall, 83% of arteries were correctly categorized by the ultrasonic arteriograph.
- Detection of 50%-99% diameter reduction stenosis was 89% accurate.
- Sensitivity and specificity for detecting 50% or greater stenosis were both 96%.
Conclusions:
- The Hokanson Ultrasonic Arteriograph provides an accurate noninvasive estimation of carotid artery stenosis.
- This ultrasound technique demonstrates high sensitivity and specificity for detecting significant carotid stenosis.
- Ultrasonic arteriography is a reliable tool for prescreening and assessing carotid bifurcations.
Abstract:
Forty-six consecutive studies of carotid bifurcations were done with a Hokanson Ultrasonic Arteriograph before contrast arteriography. Based on the Doppler signal and the oscilloscopic image, each internal carotid artery was sorted into one of four categories as an estimation of the percent diameter reduction: less than or equal to 10 percent, 10 percent to 49 percent, 50 percent to 99 percent, and total occlusion. These results were compared with the percent diameter reduction determined from contrast arteriograms by a vascular radiologist unaware of the noninvasive test results. Overall, 83 percent of the arteries were correctly categorized. Detection of stenosis in the 50 percent to 99 percent range was 89 percent accurate. The sensitivity and specificity in detecting a 50 percent or greater stenosis were both 96 percent.