- Oral presentation
- Open Access
Multimodality imaging in transcatheter aortic valve implantation (TAVI): comparison between cardiovascular magnetic resonance, cardiac computed tomography and echocardiography
© Andrew et al; licensee BioMed Central Ltd. 2011
- Published: 2 February 2011
- Imaging Modality
- Cardiovascular Magnetic Resonance
- Aortic Root
- Transthoracic Echocardiography
- Transcatheter Aortic Valve Implantation
Patients considered for TAVI often undergo several cardiac imaging investigations during assessment. Although each imaging modality has its particular advantages, not all imaging modalities are universally available. This study sought to determine the agreement and variability of cardiovascular magnetic resonance (CMR), electrocardiograph-gated cardiac computed tomography (cardiac CT) and transthoracic echocardiography in the assessment of aortic root size and morphology.
Patients undergoing TAVI assessment with CMR, cardiac CT and echocardiography, were recruited to the study. Agreement and variability between each imaging modality in the measurement of aortic annulus, sinus of valsalva, sinotubular junction and ascending aorta dimensions was assessed by Bland-Altman analysis. Intraobserver and interobserver variability was also assessed and compared.
Of 201 patients undergoing TAVI assessment with both CMR and Echocardiography, 133 also underwent an ECG-gated Cardiac CT scan. Close agreement was observed between CMR and Cardiac CT in the assessment of aortic annulus dimensions (Bias -0.4 mm, SD of Bias 2.7mm, 95% Limits of agreement -5.7mm to 5.0mm), sinus of valsalva dimensions (Bias -0.6 mm, SD of Bias 2.5mm, 95% Limits of agreement -4.3mm to 5.5mm), sinotubular junction dimensions (Bias -0.7 mm, SD of Bias 2.4mm, 95% Limits of agreement -5.3mm to 3.9mm), and ascending aorta dimensions at the level of the right pulmonary artery (Bias -0.1 mm, SD of Bias 2.6mm, 95% Limits of agreement -5.3mm to 5.1mm).
Agreement between echocardiography-derived measures and either CMR or Cardiac CT was less tight. CMR to echocardiography agreement in aortic annulus dimensions (Bias -4.0 mm, SD of Bias 6.5mm, 95% Limits of agreement -16.7mm to 8.8mm), sinus of valsalva dimensions (Bias -0.7 mm, SD of Bias 4.5mm, 95% Limits of agreement -9.6mm to 8.1mm), sinotubular junction dimensions (Bias -2.1 mm, SD of Bias 4.7mm, 95% Limits of agreement -11.2mm to 7.1mm), and ascending aorta dimensions at the level of the right pulmonary artery (Bias -0.0 mm, SD of Bias 4.0mm, 95% Limits of agreement -7.8mm to 7.8mm). Intraobserver and interobserver variability was lowest in CMR-derived measures followed by Cardiac CT then transthoracic echocardiography.
In patients undergoing assessment for TAVI, close agreement exists between CMR and ECG-gated Cardiac CT in the assessment of aortic root dimensions. Low intraobserver and interobserver variability was seen in both modalities, although best with CMR. Lower agreement and higher variability was observed between echocardiography and the other two imaging modalities.
This article is published under license to BioMed Central Ltd. This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.