J Korean Surg Soc.  2011 May;80(5):348-354. 10.4174/jkss.2011.80.5.348.

Measurement of carotid artery stenosis: correlation analysis between B-mode ultrasonography and contrast arteriography

• Lee KW
• Park YJ
• Rho YN
• Kim DI
• Kim YW

• KMID: 2212160
• DOI: http://doi.org/10.4174/jkss.2011.80.5.348

Abstract

PURPOSE
To evaluate the efficacy of B-mode ultrasonography (US) in measurement of carotid stenosis% (CS%).
METHODS
One hundred and thirth-three carotid arteries in 96 patients who underwent both carotid US and carotid arteriography (CA) were included in this retrospective study. To measure CS% on US, a cross sectional view of the most stenotic segment of the internal carotid artery was captured and residual diameter and original diameter of that segment were measured with electronic caliper on the same plane and in the same direction. To measure CS% on an angiogram, we used European Carotid Surgery Trial (ECST) and the North American Symptomatic Carotid Endarterectomy Trial (NASCET) methods. Pearson's correlation analysis and linear regression analysis were used to determine the correlation between CS% on an US and angiogram.
RESULTS
Pearson's correlation coefficient (R) between CS% measured in US and CA were 0.853 (ECST method, P < 0.001) and 0.828 (NASCET method, P < 0.001). Accuracies of B-mode US were 93.2%, 88.0%, and 81.2% for estimating CS% by ECST method and 86.5%, 82.7%, and 82% for estimating CS% by NASCET method.
CONCLUSION
CS% measured in B-mode US was simpler and showed a strong positive correlation with that measured on an arteriogram either ECST or NASCET method.

Keyword

Carotid stenosis; Ultrasonography; Accuracy; Arteriography

MeSH Terms

Angiography
Carotid Arteries
Carotid Artery, Internal
Carotid Stenosis
Electronics
Electrons
Endarterectomy, Carotid
Humans
Linear Models
Retrospective Studies

Figure

• 

  Fig. 1 Calculation of carotid stenosis% on a transverse scan color flow ultrasonography image of the internal carotid artery: residual diameter (RD) indicates the shortest diameter of residual lumen of the most stenotic segment of the internal carotid artery and original diameter (OD) indicates a diameter from the outer media-to-outer media in a same plane and a same direction with RD.

• 

  Fig. 2 Scatter diagrams of the carotid stenosis% (CS%) measured ultrasonography (US) in reference to CS% measured on carotid angiogram. (A) Angiographic CS% measured by European Carotid Surgery Trial method. (B) Angiographic CS% measured by North American Symptomatic Carotid Endarterectomy Trial method.

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