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Maximum Diameter Measurements of Aortic Aneurysms on Axial CT Images After Endovascular Aneurysm Repair: Sufficient for Follow-up?

Baumueller, Stephan ; Nguyen, Thi ; Goetti, Robert ; Lachat, Mario ; Seifert, Burkhardt ; Pfammatter, Thomas ; Frauenfelder, Thomas

In: CardioVascular and Interventional Radiology, 2011, vol. 34, no. 6, p. 1182-1189

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    Title
    • Maximum Diameter Measurements of Aortic Aneurysms on Axial CT Images After Endovascular Aneurysm Repair: Sufficient for Follow-up?
    Author
    • Baumueller, Stephan. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Nguyen, Thi. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Goetti, Robert. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Lachat, Mario. Division of Cardiac and Vascular Surgery, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Seifert, Burkhardt. Biostatistics Unit, Institute of Social and Preventive Medicine, University of Zurich, Hirschengraben 84, 8001, Zurich, Switzerland
    • Pfammatter, Thomas. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    • Frauenfelder, Thomas. Institute of Diagnostic and Interventional Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • CardioVascular and Interventional Radiology, 2011, vol. 34, no. 6, p. 1182-1189. Springer-Verlag
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:322036
    Summary
    Purpose: To assess the accuracy of maximum diameter measurements of aortic aneurysms after endovascular aneurysm repair (EVAR) on axial computed tomographic (CT) images in comparison to maximum diameter measurements perpendicular to the intravascular centerline for follow-up by using three-dimensional (3D) volume measurements as the reference standard. Materials and Methods: Forty-nine consecutive patients (73±7.5years, range 51-88years), who underwent EVAR of an infrarenal aortic aneurysm were retrospectively included. Two blinded readers twice independently measured the maximum aneurysm diameter on axial CT images performed at discharge, and at 1 and 2years after intervention. The maximum diameter perpendicular to the centerline was automatically measured. Volumes of the aortic aneurysms were calculated by dedicated semiautomated 3D segmentation software (3surgery, 3mensio, the Netherlands). Changes in diameter of 0.5cm and in volume of 10% were considered clinically significant. Intra- and interobserver agreements were calculated by intraclass correlations (ICC) in a random effects analysis of variance. The two unidimensional measurement methods were correlated to the reference standard. Results: Intra- and interobserver agreements for maximum aneurysm diameter measurements were excellent (ICC=0.98 and ICC=0.96, respectively). There was an excellent correlation between maximum aneurysm diameters measured on axial CT images and 3D volume measurements (r=0.93, P<0.001) as well as between maximum diameter measurements perpendicular to the centerline and 3D volume measurements (r=0.93, P<0.001). Conclusion: Measurements of maximum aneurysm diameters on axial CT images are an accurate, reliable, and robust method for follow-up after EVAR and can be used in daily routine