Aortic Valve Adaptation to Aortic Root DilatationCLINICAL PERSPECTIVE

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Presentation transcript:

Aortic Valve Adaptation to Aortic Root DilatationCLINICAL PERSPECTIVE by Dae-Hee Kim, Mark D. Handschumacher, Robert A. Levine, Byung Joo Sun, Jeong Yoon Jang, Dong Hyun Yang, Joon-Won Kang, Jong-Min Song, Duk-Hyun Kang, Tae-Hwan Lim, and Jae-Kwan Song Circ Cardiovasc Imaging Volume 7(5):828-835 September 16, 2014 Copyright © American Heart Association, Inc. All rights reserved.

Representative images showing different aortic regurgitation (AR) severity despite similar aortic root size. Representative images showing different aortic regurgitation (AR) severity despite similar aortic root size. Upper panel shows severe AR (middle) with a huge central coaptation defect (yellow arrow in the right). Lower panel shows no significant AR with markedly dilated aortic root. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Localization of annular reference points (white spheres) at the junctions between the left (red), right (green), and noncoronary (blue) annular segments, shown with a cross-sectional image through the aortic root (left and middle) and alone in 3-dimensional (right). Localization of annular reference points (white spheres) at the junctions between the left (red), right (green), and noncoronary (blue) annular segments, shown with a cross-sectional image through the aortic root (left and middle) and alone in 3-dimensional (right). Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Reconstructed aortic root images for calculation of aortic root and individual cusp sinus volumes. Reconstructed aortic root images for calculation of aortic root and individual cusp sinus volumes. For aortic root volume, the junction of the left ventricular outflow tract (LVOT) with the aortic root and the sinotubular junction (STJ) with the ascending aorta were traced to provide surface boundaries between which the area contained by the sinus surfaces was automatically computed. The individual sinus volume was then computed by summing the internal volumes between the cup-like sinus surface and its umbrella-like capping surface (bottom right). The capping surface was constructed by connecting the centroid of these sinus boundaries to the boundaries themselves. LCA indicates left coronary artery; and RCA, right coronary artery. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Reconstructed aortic cusp images at mid-diastole (closed; left) and mid-systole (open; right) are illustrating calculation of individual cusp surface areas and sinus volumes. Reconstructed aortic cusp images at mid-diastole (closed; left) and mid-systole (open; right) are illustrating calculation of individual cusp surface areas and sinus volumes. The color coding of the cusp surfaces based on proximity to adjacent cusps are illustrated in Figure 5. LCC indicates left coronary cusp; NCC, noncoronary cusp; and RCC, right coronary cusp. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Representative images showing differences in cusp surface areas and coapted surface areas in normals (top) and patients with aortic root dilatation (ARD). Representative images showing differences in cusp surface areas and coapted surface areas in normals (top) and patients with aortic root dilatation (ARD). Cusp enlargement is prominent in ARD patients and greatest in those with aortic regurgitation (AR), but the left coronary cusp remains relatively small. Asymmetry of ARD can also be easily appreciated by measurement of intercommissural distances. The cusp surfaces are color-coded to show differences in the distance of closest approach to neighboring cusp surfaces: red, green, blue, and yellow correspond to surface regions that are <1, 2, 3, and >3 mm of adjacent cusps. For statistical analysis, we considered the red areas <1 mm as coapted. L indicates left; N, noncoronary; and R, right cusp. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Representative images showing measurement of the mid-sinus maximal cross-sectional area (A) and minimal 3-dimensional (3D) annular area (B). Representative images showing measurement of the mid-sinus maximal cross-sectional area (A) and minimal 3-dimensional (3D) annular area (B). A, A volume-rendered 3D aortic root image (left) guides selection of a long-axis plane (middle) to localize the maximal cross-sectional area parallel to the plane of the reference commissural points (not shown). LCA indicates left coronary artery; and RCA, right coronary artery. On the resulting plane (right), the sinus border is traced and area measured. In this example, cross-sections through the cusps are visible allowing identification of the area associated with the left (L), right (R), and noncoronary (N) cusps. B, The top row is an en face view into the reference plane and the bottom is an angulated view. From left to right are the 3D annulus, the 3D minimal annular area of closure with polyhedral vertices used to calculate the surface (white), and the mesh surface is color-coded based on association with the nearest cusp. The 3 white spheres in each panel show the coaptation points of the annulus. The central white sphere in the middle panel is the centroid of the annular coaptation (reference commissural points) used to define the initial polyhedral mesh for surface minimization. CSA indicates cusp surface area; LCC, left coronary cusp; NCC, noncoronary cusp; and RCC, right coronary cusp. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Representative images showing inadequate cusp enlargement in patients with aortic root dilatation (ARD) and aortic regurgitation (AR). Representative images showing inadequate cusp enlargement in patients with aortic root dilatation (ARD) and aortic regurgitation (AR). Compared with normal controls, patients with ARD had markedly increased cusp surface area (CSA). However, the ratio of closed CSA to maximal mid-sinus area, reflecting cusp adaptation, decreased from normal to AR-negative to AR-positive patient (1.22 to 0.97–0.76). CAF indicates coaptation area fraction; L, left; N, noncoronary; and R, right cusp. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.

Geometric changes in the aortic root and cusps by 3-dimensional data analysis. Geometric changes in the aortic root and cusps by 3-dimensional data analysis. Error bars indicate standard deviation. *P<0.05 between normal controls and aortic root dilatation with aortic regurgitation (AR); §P<0.05 between aortic root dilatation with and without AR. CSA indicates cusp surface area. Dae-Hee Kim et al. Circ Cardiovasc Imaging. 2014;7:828-835 Copyright © American Heart Association, Inc. All rights reserved.