OBJECTIVES: To evaluate for the first time the degree of compliance between conventionalÂ multisliceÂ computedÂ tomographyÂ (MSCT) andÂ three dimensional rotationalÂ angiographyÂ (3D-RA) in measuring relevant dimensions of theÂ aorticÂ annulus, theÂ aorticÂ rootÂ and the thoracic aorta inÂ patientsÂ undergoing TA-AVI.
METHODS: Twenty-sevenÂ patientsÂ (82Â Â±Â 11Â years) with severeÂ aorticÂ stenosis received contrast enhanced ECG gatedÂ MSCTÂ prior toÂ TA-AVIÂ and intra-proceduralÂ rotationalÂ angiography. TheÂ aorticÂ annulus size, the distance to the coronary ostia and diameters of theÂ aorticÂ rootÂ and the thoracic aorta were measured with both methods by two observers blinded to each other. Linear regression and Bland-Altman analysis were performed to determine the degree of compliance between both methods.
RESULTS: The limits of agreement were within two standard deviations for allÂ measurementsÂ and with high correlation especially for the supra-annular dimensions. Sizing of theÂ aorticÂ annulus revealed lower interobserverÂ variabilityÂ forÂ MSCTÂ than forÂ 3D-RAwith a maximum deviation of 2.1Â Â±Â 2.5 and 1.7Â Â±Â 2.8Â mm for diameterÂ measurementsÂ and for the effective diameter, respectively.
CONCLUSIONS: With current protocols intra-proceduralÂ 3D-RAÂ provides good image quality especially for structures above theÂ aorticÂ annulus. Due to a lower interobservervariabilityÂ in sizing theÂ aorticÂ annulusÂ MSCTÂ remains more suitable forÂ aorticÂ rootÂ assessment prior toÂ TA-AVI. Tom Compton Authentic Jersey