AI Article Synopsis
- During catheter ablation for pulmonary vein isolation, fluoroscopic angiography can lead to misleading estimates of the ostia size since it only measures projected diameters.
- A study involving 42 patients with idiopathic atrial fibrillation used 3D magnetic resonance angiography to analyze both minimal and maximal diameters of pulmonary vein (PV) ostia, revealing that the left PV ostia were notably more oval-shaped, resulting in a significant discrepancy between the actual and projected measurements.
- The findings suggest that while PV ostia may appear normal on angiograms, they can be narrower than expected, particularly on the left side, which could impact the effectiveness of the ablation procedure.
Article Abstract
Background: During a catheter ablation procedure for selective electrical isolation of pulmonary vein (PV) ostia, the size of these ostia is usually estimated using fluoroscopic angiography. This measurement may be misleading, however, because only the projected supero/inferior ostium diameters can be measured. In this study, we analyzed 3-dimensional magnetic resonance angiographic (MRA) images to measure the minimal and maximal cross-sectional diameter of PV ostia in relation to the diameter that would have been projected on fluoroscopic angiograms during a catheter ablation procedure.
Methods And Results: In 42 patients with idiopathic atrial fibrillation who were scheduled for selective electrical isolation of PV ostia, the minimal and maximal diameters of these ostia were measured from 3-dimensional MRA images. Thereafter, these images were oriented in a 45 degrees right or left anterior oblique direction and the projected diameter of the PV ostia were measured again. The average ratio between maximal and minimal diameter was 1.5+/-0.4 for the left and 1.2+/-0.1 for the right pulmonary vein ostia. Because of the orientation and oval shape of especially the left pulmonary vein ostia, their minimal diameters were significantly smaller than the projected diameters.
Conclusion: Pulmonary vein ostia, especially those at the left, are oval with the short axis oriented approximately in the antero/posterior direction. Consequently, PV ostia may sometimes be very narrow despite a rather normal appearance on angiographic images obtained during a catheter ablation procedure.
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| http://dx.doi.org/10.1161/01.cir.0000047065.49852.8f | DOI Listing |
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