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Aortic annulus dimension assessment by computed tomography for transcatheter aortic valve implantation: differences between systole and diastole

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Abstract

Accurate assessment of aortic annular dimensions is essential for successful transcatheter aortic valve implantation (TAVI). Annular dimensions are conventionally measured in mid-systole by multidetector computed tomography (MDCT), echocardiography and angiography. Significant differences in systolic and diastolic aortic annular dimensions have been demonstrated in cohorts without aortic stenosis (AS), but it is unknown whether similar dynamic variation in annular dimensions exists in patients with severe calcific AS in whom aortic compliance is likely to be substantially reduced. We investigated the variation in aortic annular dimensions between systole and diastole in patients with severe calcific AS. Patients with severe calcific AS referred for TAVI were evaluated by 128-slice MDCT. Aortic annular diameter was measured during diastole and systole in the modified coronal, modified sagittal, and basal ring planes (maximal, minimal and mean diameters). Differences between systole and diastole were analysed by paired t test. Fifty-nine patients were included in the analysis. Three of the five aortic dimensions measured increased significantly during systole. The largest change was a 0.75 mm (3.4%) mean increase in the minimal diameter of the basal ring during systole (p = 0.004). This corresponds closely to the modified sagittal view, which also increased by mean 0.42 mm (1.9%) during systole (p = 0.008). There was no significant change in the maximal diameter of the basal ring or the modified coronal view during systole (p > 0.05). There is a small magnitude but statistically significant difference in aortic annulus dimensions of patients with severe AS referred for TAVI when measured in diastole and systole. This small difference is unlikely to alter clinical decisions regarding prosthesis size or suitability for TAVI.

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Authors and Affiliations

  1. Cardiovascular Research Centre, Royal Adelaide Hospital, Adelaide, Australia

    Angela G. Bertaso, Dennis T. L. Wong, Gary Y. H. Liew, Michael S. Cunnington, James D. Richardson, Viji S. Thomson, Matthew I. Worthley & Stephen G. Worthley

  2. Department of Medicine, University of Adelaide, Adelaide, Australia

    Dennis T. L. Wong, James D. Richardson, Matthew I. Worthley & Stephen G. Worthley

  3. Department of Radiology, Royal Adelaide Hospital, Adelaide, Australia

    Brett Lorraine, George Kourlis & Diana Leech

  4. Cardiovascular Investigational Unit, Level 6 Theatre Block, North Terrace, Adelaide, SA, 5000, Australia

    Stephen G. Worthley

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  1. Angela G. Bertaso
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  2. Dennis T. L. Wong
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  3. Gary Y. H. Liew
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  4. Michael S. Cunnington
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  5. James D. Richardson
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  6. Viji S. Thomson
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  7. Brett Lorraine
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  9. Diana Leech
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  10. Matthew I. Worthley
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  11. Stephen G. Worthley
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Correspondence to Stephen G. Worthley.

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Bertaso, A.G., Wong, D.T.L., Liew, G.Y.H. et al. Aortic annulus dimension assessment by computed tomography for transcatheter aortic valve implantation: differences between systole and diastole. Int J Cardiovasc Imaging 28, 2091–2098 (2012). https://doi.org/10.1007/s10554-012-0018-4

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  • DOI: https://doi.org/10.1007/s10554-012-0018-4

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