The Study Of Morphologic Haracteristics Of The Left Atrium And Pulmonary Vein With 64-slice Multidector Computedtomography

OBJECTIVES: The purpose of this study was to evaluate the morphologic haracteristics of left atrium and pulmonary vein with multislice computed tomography to guide radiofrequency catheter ablation of atrium fibrillation .METHODS: Between February 2006 and February 2007, We studied morphologic haracteristics of the left atrium and pulmonary vein of 88 patients underwent 3D imaging and virtual endoscopy using a 64-slice MSCT scanner,AF group 46 person and 42 control subjects without a history of AF.RESULTS:1.PV:Most people have four PVs,a few people have five PVs. In the AF group,the area of the orifice were not significantly larger than those in the control group.The variation of PV orientation were clearly described in 3D image. 2. The LAA orifice was asymmetrical and oval-shaped in all subjects.In the AF group,the area of the orifice were not significantly larger than those in the control group. The LAA ridge interposed between the LAA and LSPV orifices was evident in all control and AF patients.3. A variety of LA roof morphologies were shown,Typeâ… ,convex; Typeâ…¡,flat; Typeâ…¢, concave.LA roof pouches were demonstrated in 11(12.5%) subjects. CONCLUSION: 1. MSCT of the pulmonary veins can be used to guide the electrophysiologist by providing anatomic details noninvasively before the procedure, including the number, location, and size of pulmonary veins and pulmonary vein branching anomalies.2. This study showed that the LAA ofrice size was not larger in the AF patients than in the control subjects. The LAA ridge interposed between the LAA and LSPV orifices was evident in all control and AF patients.3.It is suggested to inspection with MSCT before RFCA.