Background and Objective The purpose of this research is to reconstruct 3-dimensional (3D) structure of the pulmonary veins and the left atrium through multislice computed tomography (MSCT), and then compare the variation of ostia, the antrum volume of pulmonary veins and the left atrium volume in AF patients with and without recurrence.
Methods We consecutively enrolled sixty-five AF patients who accept RFCA therapy from June 2008 to January 2009, patients were followed up for one year from the day of RFCA. All patients were injected with intravenous constrast medium before being evaluated by 16-slice computed tomography (MSCT). The 3D reconstruction of PVs and left atrium was transformed into AW4.2 system, and we calculated the variation of pulmonary veins by Cardiac IQ software. Diameters of PVs ostia were measured by virtual endoscopy. The antrum volume of PVs and the left atrium volume were calculated by software volume rendering (VR).
Results Pulmonary vein anatomical variations type in two groups showed no significant differences. The antrum volume of the bilateral PVs in the patients with recurrence was significantly larger than that in the patients without recurrence, left (3.84 ± 0.75 vs. 3.24 ± 0.49cm3, P < 0.05), right (4.95 ± 1.48 vs. 4.54 ± 1.11cm3, P < 0.01). The left atrium volume in the patients with recurrence group was also significantly larger than in the patients without recurrence group (99.85 ± 22.67 vs. 91.23 ± 17.31, P < 0.05), The antrum volume of bilateral PVs justified with left atrial volume had no significant difference between the two groups.
Conclusions The maximum and minimum diameter of PVs ostia, the left atrium volume of bilateral PVs and left atrium in patients with recurrence group were significantly larger than no recurrence group. But it had no relationship with the atrium volume of bilateral PVs justified by left atrium volume.