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Validation of intravascular ultrasound in arteriosclerotic peripheral vessels
S Kerber1, C Fechtrup, T Budde
1Hospital of the Westfälische Wilhelms-University of Münster, Department of Cardiology and Angiology, Germany.
Insights
This study validated intravascular ultrasound (IVUS) for detecting irregularities in peripheral arteries. IVUS accurately identified arterial structures and intimal thickening in arteriosclerotic human vessels.
Area of Science:
- Vascular Biology
- Medical Imaging
Background:
- Peripheral arteriosclerosis involves changes in vessel contours, intra-arterial structures, and intimal thickening.
- Accurate detection of these changes is crucial for diagnosis and treatment planning.
Purpose of the Study:
- To validate intravascular ultrasound (IVUS) for detecting irregular luminal contours, intra-arterial structures, and intimal thickening in human peripheral arteriosclerotic arteries.
- To compare sonographic criteria with the morphological composition of arteriosclerotic lesions.
Main Methods:
- In vitro study using 69 post-mortem human peripheral artery segments from 6 patients.
- Segments were fixed, examined with IVUS, and morphologically evaluated.
- Sensitivity, specificity, predictive values, and accuracy were calculated for IVUS detection of various arterial features.
Main Results:
- IVUS demonstrated high accuracy in detecting regular luminal contours (88.4%), intra-arterial structures (96.4%), and arteriosclerotic lesions (86.9%).
- Detection of intimal thickening showed a sensitivity of 85.9% and specificity of 87.8%.
- Ultrasonic features like echogenicity and homogeneity could not reliably differentiate between fibrous, atheromatous, or calcified lesions.
Conclusions:
- Intravascular ultrasound is a validated tool for identifying key features of peripheral arteriosclerosis in vitro.
- While effective for structural detection, IVUS characteristics alone have limitations in predicting the specific composition of arteriosclerotic lesions.
Abstract:
In this in vitro-study, we validated intravascular ultrasound for the detection of irregular luminal contours, intraarterial structures, intimal thickening in peripheral arteriosclerotic human vessel segments and we compared sonographic criteria to the composition of arteriosclerotic lesions. Sixty-nine post-mortem segments of human peripheral arteries (6 patients) were fixed in formalin, examined with intravascular ultrasound and morphologically evaluated. Specificity, sensitivity, both positive and negative predictive value and accuracy of intravascular ultrasound for the detection of irregular luminal contours, intra-arterial structures and intimal thickening were determined for each of four quadrants. Ultrasonic features (echogeneity, homogeneity, shadowing of echoes) were also compared to the composition of lesions. Intravascular ultrasound detected regular (normal) luminal contours with a high specificity of 96.5%, a sensitivity of 65.0% and an accuracy of 88.4%. Intra-arterial structures were detected with a sensitivity of 88.6%, a specificity of 97.8% and an accuracy of 96.4%. Arteriosclerotic lesions could be localized with a sensitivity of 86.1%, a specificity of 99.1% and an accuracy of 86.9%. Intimal thickening was detectable with a sensitivity of 85.9%, a specificity of 87.8% and an accuracy of 86.2%. Meanwhile, fibrous, atheromatous and combined lesions without calcification did not show shadowing of echoes. The majority of fibrous or atheromatous lesions presented with homogeneous echoes showing hypo-, hyper- and normal density echoes. Using a 20-MHz transducer, homogeneity and echogeneity of echo patterns cannot accurately predict the different components of combined arteriosclerotic lesions.