RESUMO
Objective Using CT three-dimensional image technique to observe the pulmonary vein stenosis of circumferential pulmonary vein ablation (CPVA) for atrial ifbrillation (AF) on the structure of pulmonary vein before and after radiofrequency ablation. Methods 28 patients with AF who underwent CPVA were followed-up for a mean (6.5±3.9) months.The results of Pulmonary vein morphology study was compared with analysis of preablation, after following up radiofrequency catheter alation (6.5±3.9) months. Pulmonary vein diameters, cross-sectional area and left atrial volume were measured before and after CPVA using 64-slice multidector computed tomography (CT). Results Mild stenosis of pulmonary vein maximum diameter and pulmonary minimum diameter were 61.6%and 56.3%after CPVA. Moderate stenosis of pulmonary vein maximum diameter and pulmonary minimum diameter were 3.6%and 5.4%. All patients does not present symptoms of pulmonary vein stenosis at rest on during excercise during follow up. Conclusions Mild and moderate asymptomatic pulmonary vein stenosis may present in some patients after CPVA.