Key result
Ascending aortic diameter fluctuates more than area during the cardiac cycle.
Why the study?
Correct stent-graft sizing for thoracic endovascular repair in zone 0 requires understanding of longitudinal and circumferential aortic changes during the cardiac cycle beyond diameter alone.
Observational (n=92)
Aortic area measurements show smaller pulsatile changes during the cardiac cycle than diameter measurements, suggesting area may be a more reliable metric for sizing in thoracic endovascular repair.
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Area-based aortic sizing may reduce pulsatile variability in TEVAR planning; hypothesis-generating and requires prospective validation before practice change.
Belvroy et al. (2020) conducted an observational in Patients evaluated for transcatheter aortic valve replacement (n=92). Cardiac cycle phase (systole vs diastole) was evaluated on Mean change between systole and diastole of the area, perimeter, and diameter at 3 different locations in the ascending aorta. During the cardiac cycle, changes in ascending aortic diameter are larger than changes in area, with the percentage change being smallest for area at the sinotubular junction (2.6%) compared to diameter (4.7%).
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