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KMID : 1033520120030010025
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Korean Society of Medical Sonographers
2012 Volume.3 No. 1 p.25 ~ p.31
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Internal Blood Flow Visualization According to Stenosis by Calcified Plaque on Carotid Doppler Ultrasonography
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Lee Won-Hong
Lee Mi-Hwa
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Abstract
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Purpose : In case of the calcified plaque, it is hard to examine the internal blood flow. There is no report about the concrete figure whether or not the internal blood flow can be examined at what percentages. Therefore, we investigated the internal blood flow due to the calcified plaque in the carotid can be examined at what percentages, also do that depending on the stenosis at what percentages for each one.
Materials and Methods : We evaluated 187 parts of 145 patients, who were with stenosis more or 30% by calcified plaque at the proximal internal carotid artery and common carotid artery (CCA) bifurcation out of 788 patients; 788 patients had a CCA doppler scan as had been admitted to this hospital and outpatients, from January 2010 to October 2011. We classified five stages according to stenosed degree into type 1(30-39%), type 2(40-49%), type 3(50-59%), type 4(60-69%) and type 5(≥70%). And then we checked the patient"s internal blood flow.
Results : The rate was very high in case the internal blood flow was visualized among the 187 parts; 85.6%(160/187). This study showed the result of internal blood flow rate per stenosis %. Type 1 was 91.9%(68/74), Type 2 90.2%(46/51), Type 3 75.8%(25/33), Type 4 61.1%(11/18) and Type 5 90.9%(10/11). We could visualize the internal blood flow over 90% except Type 3 and 4(p=0.005).
Conclusion : It is difficult to examine the internal blood flow in case of stenosed vessel; calcified plaque disturbs ultrasound signals. As a result of this study, it is possible to examine the internal blood flow by changing probe direction in several ways, even if plaque became calcification.
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KEYWORD
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Calcified plaque, Stenosis, Internal blood flow, Carotid doppler ultrasonography
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