Study patients:
Consecutive patients with symptomatic, drug-refractory paroxysmal or
persistent AF referred for ablation were studied. A CTA of the left
atrium was performed before the ablation to assess the left atrial size,
PV anatomy and to exclude the presence of a left atrial appendage
thrombi. The CTA obtained was used as the gold standard to assess the LA
anatomy of the patients enrolled in the study.