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Erschienen in:
23.11.2016 | Original Article
Quantification of motion of the thoracic aorta after ascending aortic repair of type-A dissection
Erschienen in: International Journal of Computer Assisted Radiology and Surgery | Ausgabe 5/2017
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Purpose
To quantify cardiac and respiratory deformations of the thoracic aorta after ascending aortic graft repair.
Methods
Eight patients were scanned with cardiac-resolved computed tomography angiography during inspiratory/expiratory breath-holds. Aortic centerlines and lumen were extracted to compute the arclength, curvature, angulation, and cross-section shape.
Results
From systole to diastole, the angle of graft \(\sim \) arch increased by 2.4\({^{\circ }}\) ± 1.8\({^{\circ }}\) (P < 0.01) and the angle of arch \(\sim \) descending aorta decreased by 2.4\({^{\circ }}\) ± 2.6\({^{\circ }}\) (P < 0.05), while the effective diameter of the proximal arch decreased by 2.4 ± 1.9% (P < 0.01), a greater change than those of the graft or distal arch (P < 0.05). From inspiration to expiration, the angle of graft \(\sim \) arch increased by 2.8\({^{\circ }}\) ± 2.6\({^{\circ }}\) (P < 0.02) with the peak curvature increase (P < 0.05). Shorter graft length was correlated with greater cardiac-induced graft \(\sim \) arch angulation, and longer graft length was correlated with greater respiratory-induced arch \(\sim \) descending aorta angulation (R
\(\ge \) 0.50).
Conclusion
The thoracic aorta changed curvature and angulation with cardiac and respiratory influences, driven by aortic root and arch motion. The thoracic aortic geometry and deformation are correlated with the ascending aortic graft length.