Keywords:
Technical aspects, Surgery, Ablation procedures, CT-Angiography, CT, Cardiovascular system, Cardiac, Embolism / Thrombosis
Authors:
A. Rizvi1, N. M. Weber2, S. P. Arunachalam2, E. N. Sheedy2, S. Leng1, E. E. Williamson2; 1Rochester, MN/US, 2Rochester/US
DOI:
10.26044/ecr2019/C-2958
Methods and materials
Patients were retrospectively identified who underwent multiphase ECG-gated cardiac CT for A.Fib catheter ablation or LAA occlusion device planning.
All CT were performed on dual-source SOMATOM Definition scanners (Siemens Healthcare).
Reconstructions were performed throughout the cardiac cycle (0-95%) at 5% increments.
Quantitative measurements were performed utilizing TeraRecon Aquarius workstation (iNtuition,
Ver.4.4.13) (Fig.
1).
The LAA ostium was defined as the plane connecting the pulmonary vein ridge superiorly to the inferior junction of the left atrium or LAA at the left circumflex artery.
Maximal and minimal effective LAA diameters were measured at largest (diastole) and smallest (systole) atrial phases,
respectively.
Variability of LA/LAA dynamics was calculated by the difference between maximal and minimal effective diameters and compared between patients with paroxysmal versus persistent A.Fib.
P-value of ≤0.05 was considered statistically significant.