Aortic balloon valvuloplasty outcome according to calcium distribution and valve geometry - The ABCD study.

Background: There is little data on the outcome of balloon aortic valvuloplasty (BAV) in relation to valve dimensions and calcification patterns. The procedure is not standardized, particularly the choice of balloon size.

Methods: This retrospective multicenter study focused on BAV efficacy and safety by analyzing the relationship between balloon size, annulus geometry (i.e., diameters, perimeter, and area), and calcification patterns (total burden and calcium distribution over each individual leaflet). From March 2018 to March 2023, all consecutive patients who underwent clinically indicated BAV and ECG-gated multidetector computed tomography of the aorta were included, except those with a bicuspid valve. Calcium score was calculated on contrast-enhanced images based on a luminal attenuation threshold of +100 HU.

Results: One hundred and fifteen patients were included. Procedural success was 82.6 %. The balloon-to-annulus ratio (BAR) relative to diameter, perimeter, and area was higher in patients with successful BAV. Patients with unsuccessful BAV had a significantly higher aortic valve calcium burden. The complication rate was 4.3 % and there was no association with valve geometry or calcium burden. A trend towards a reduced complication rate was found as calcium asymmetry increased. BAR minimum annulus diameter was the best parameter in predicting procedural success, with a cut-off at 0.85.

Conclusions: BAV efficacy is correlated directly with balloon size in relation to annulus dimension and inversely with total calcium burden. The minimum diameter of the valve may be adopted as a reference for balloon sizing.