Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study
Background and Purpose: Knowledge of the reproducibility of a diagnostic method is important in order to evaluate its usefulness. Few studies have examined interobserver and intermethod agreement on ultrasound measurements of carotid stenosis. Methods: Intersonographer agreement on ultrasound measur...
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Online Access: | http://dx.doi.org/10.1159/000016058 https://www.karger.com/Article/Pdf/16058 |
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crskarger:10.1159/000016058 2024-10-06T13:53:12+00:00 Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study Mathiesen, Ellisiv B. Joakimsen, Oddmund Bønaa, Kaare H. 2000 http://dx.doi.org/10.1159/000016058 https://www.karger.com/Article/Pdf/16058 en eng S. Karger AG https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses Cerebrovascular Diseases volume 10, issue 3, page 207-213 ISSN 1015-9770 1421-9786 journal-article 2000 crskarger https://doi.org/10.1159/000016058 2024-09-11T04:08:02Z Background and Purpose: Knowledge of the reproducibility of a diagnostic method is important in order to evaluate its usefulness. Few studies have examined interobserver and intermethod agreement on ultrasound measurements of carotid stenosis. Methods: Intersonographer agreement on ultrasound measurements of carotid plaque morphology and the estimated degree of stenosis by three ultrasound methods were assessed in a random sample of 51 participants with stenotic carotid arteries selected from a population health survey. The degree of stenosis was assessed by measurements of velocity, lumen diameter reduction and cross-sectional lumen area. Intermethod agreement on the degree of carotid stenosis was also assessed. Results: Agreement on plaque echogenicity and heterogeneity was moderate (κ = 0.56 and κ = 0.60, respectively). The mean degree of stenosis and median absolute difference between observers of the estimated degree of stenosis by the velocity method were 46.3 and 10.8%, respectively. The corresponding values were 51.0 and 5.8% for the diameter method, and 57.1 and 7.2%, for the cross-sectional lumen method. The limits of agreement for intersonographer reproducibility varied between ±19.7 and 26.5%. For all methods, reproducibility increased with increasing degree of stenosis. Differences between the methods were large in low-grade stenosis but were acceptable in high-grade stenosis. Conclusions: Considerable differences in ultrasound measurement of stenosis, which could lead to different clinical conclusions, were regularly encountered no matter what ultrasound method was used. Article in Journal/Newspaper Tromsø Karger Tromsø Cerebrovascular Diseases 10 3 207 213 |
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description |
Background and Purpose: Knowledge of the reproducibility of a diagnostic method is important in order to evaluate its usefulness. Few studies have examined interobserver and intermethod agreement on ultrasound measurements of carotid stenosis. Methods: Intersonographer agreement on ultrasound measurements of carotid plaque morphology and the estimated degree of stenosis by three ultrasound methods were assessed in a random sample of 51 participants with stenotic carotid arteries selected from a population health survey. The degree of stenosis was assessed by measurements of velocity, lumen diameter reduction and cross-sectional lumen area. Intermethod agreement on the degree of carotid stenosis was also assessed. Results: Agreement on plaque echogenicity and heterogeneity was moderate (κ = 0.56 and κ = 0.60, respectively). The mean degree of stenosis and median absolute difference between observers of the estimated degree of stenosis by the velocity method were 46.3 and 10.8%, respectively. The corresponding values were 51.0 and 5.8% for the diameter method, and 57.1 and 7.2%, for the cross-sectional lumen method. The limits of agreement for intersonographer reproducibility varied between ±19.7 and 26.5%. For all methods, reproducibility increased with increasing degree of stenosis. Differences between the methods were large in low-grade stenosis but were acceptable in high-grade stenosis. Conclusions: Considerable differences in ultrasound measurement of stenosis, which could lead to different clinical conclusions, were regularly encountered no matter what ultrasound method was used. |
format |
Article in Journal/Newspaper |
author |
Mathiesen, Ellisiv B. Joakimsen, Oddmund Bønaa, Kaare H. |
spellingShingle |
Mathiesen, Ellisiv B. Joakimsen, Oddmund Bønaa, Kaare H. Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
author_facet |
Mathiesen, Ellisiv B. Joakimsen, Oddmund Bønaa, Kaare H. |
author_sort |
Mathiesen, Ellisiv B. |
title |
Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
title_short |
Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
title_full |
Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
title_fullStr |
Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
title_full_unstemmed |
Intersonographer Reproducibility and Intermethod Variability of Ultrasound Measurements of Carotid Artery Stenosis: The Tromsø Study |
title_sort |
intersonographer reproducibility and intermethod variability of ultrasound measurements of carotid artery stenosis: the tromsø study |
publisher |
S. Karger AG |
publishDate |
2000 |
url |
http://dx.doi.org/10.1159/000016058 https://www.karger.com/Article/Pdf/16058 |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
Tromsø |
genre_facet |
Tromsø |
op_source |
Cerebrovascular Diseases volume 10, issue 3, page 207-213 ISSN 1015-9770 1421-9786 |
op_rights |
https://www.karger.com/Services/SiteLicenses https://www.karger.com/Services/SiteLicenses |
op_doi |
https://doi.org/10.1159/000016058 |
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Cerebrovascular Diseases |
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