磁共振成像在房颤导管射频消融术中的应用

Applications of magnetic resonance imaging in radiofrequency ablation therapy for atrial fibrillation

导管射频消融术是公认的症状性、药物难治性房颤的首选治疗方法。术前对肺静脉及左房解剖情况的准确评估至关重要,但却受限于传统的影像学方法。随着无创影像三维重建技术的日趋完善,尤其是核磁共振成像(MRI)技术,使得术前评估肺静脉及左房纤维化情况已成为现实。此外,MRI还可对术后左房损伤及瘢痕组织情况作出准确评估,可用于预测房颤的预后,亦可用于确定二次消融位点,达到彻底电隔离肺静脉。

Radiofrequency catheter ablation is an established therapy for symptomatic, drug refractory atrial fibrillation（AF）. Accurate delineation the anatomy of the pulmonary vein（PV） and the left atrium（LA） prior to ablation is critical but often challenging and limited in traditional imaging methods. There has been an increased interest in non-invasive three-dimensional imaging technologies, especially magnetic resonance imaging（MRI）, as useful tools for evaluating patients＇ anatomy of the PV and LA fibrosis pre-ablation. In addition, MRI can accurately assess the LA lesion and scar in post-ablation which can not only predict the clinical outcomes but also determine the secondary ablation sites for complete isolation of PV.