Impact of Aortic Geometry on Vascular Remodeling After Stent Implantation in Coarctation of the Aorta

"Performed before and after stenting using a multidetector CT scanner (device model and parameters to be specified).~Analysis will include:~* Evaluation of aortic arch geometry (normal / gothic / crenel).~* Measurement of residual stenosis at the site of coarctation.~* Aortic diameter measurements at predefined anatomical levels:~Ascending aorta (AA), Proximal descending thoracic aorta (PDA), At the level of the diaphragm (DA), Abdominal aorta (AbAo).~\- Aortic tortuosity. All CT data will be interpreted by two independent observers blinded to clinical outcomes"

"CMR examinations will be performed using a commercially available 1.5 Tesla whole-body scanner (Ingenia, Philips Healthcare, release 4.1.3.0). In pediatric or uncooperative patients, free-breathing sequences were used when breath-holding was not feasible.~Brachial blood pressure was measured in the right arm in the supine position immediately before image acquisition using automated oscillometric devices.~Cine steady-state free precession (SSFP) sequences were obtained in multiple views including the short axis of the ascending aorta (AAO) and descending aorta (DAO), as well as the aortic root to evaluate aortic valve morphology (bicuspid vs tricuspid).~Left ventricular (LV) and left atrial (LA) functional parameters were assessed by standard volumetric analysis. The following CMR-derived parameters were collected:~Left ventricular ejection fraction (LVEF) Left ventricular strain Left ventricular mass index (LVMI) Left atrial volume Left atrial strain LV and LA strain were analyzed usi"