Left Artial CTA Applied To The Evaluation Of Research Before Radiofrequency Ablation Of Atrial Fibrillation

Objective: Dual-source CT were left atrial CTA imaging of theanatomy and morphology of the left atrium and pulmonary veins wereanalyzed, shape and volume of the left atrium, left atrium and leftatrial appendage relations,explore the relationship between theleft atrium and pulmonary veins and atrial fibrillation, atrialfibrillation before radiofrequency ablation technique is preparedto provide clinical reference value, the left housing CTA may GFpreoperative examination and clinical application of atrialfibrillation.Materials and Methods: patients in Jilin hospital in July2013hasbeen divided into two groups were compared with the control groupof atrial fibrillation, the same as the left atrium and coronaryCTA CTA scan mode and parameters, atrial fibrillation surgery groupfront row left atrial CTA, the control group, after the exclusionof hypertension, coronary heart disease, diabetes, hyperthyroidismand other diseases routine coronary CTA, sinus rhythm control group,more control in60to75times/min, and a check coronary CTA resultswere normal. After treatment by the three-dimensional imaging and MPR, etc., the left atrium and pulmonary veins in relatively clearanalysis applications like image quality of the conduct.Observation of morphology top left atrium, left atrial appendageand the positional relationship between the left atrium, the leftatrium volume calculation, the number of branches of the pulmonaryvein and the horizontal angle between the pulmonary vein and otherdata, then the corresponding statistical analysis, the statisticalsignificance in conclusion.The results:1. Comparison of the left atrium top form: by observingthe coronal reconstruction and post VR image processing images, canclear observation of the form at the top of the left atrium, dividedinto flat type, uplift type, depressed type categories. In thisstudy, two groups of patients were40cases, including15cases ofatrial fibrillation group ridges, flat type25cases; the controlgroup uplift in5cases,30cases flat, depressed five cases.Comprehensive data analysis,2patients in the left atrium top formwith flattened mostly left atrial fibrillation group protruded topmorphological variation is more common.2. The number of pulmonaryvein:80patients were able to be clearly displayed around thepulmonary vein branch. Wherein the left and right pulmonary veinswere two normal group had56cases, accounting for70%(30patientswith atrial fibrillation,26cases in the control group);24cases of variation exists, the left pulmonary vein three five cases,accounting for6.2%(AF group2cases,3cases in the control group);the right of three pulmonary veins in16cases,20%(AF group2patients in the control group, n=1); the right of multiplepulmonary veins (≥4)3cases, accounting for3.7%(room Shake group2patients in the control group1case). The above data shows thatspecies variation in pulmonary vein, the right three high mutationrate.3. The maximum diameter of the pulmonary vein opening: openingmaximum diameter of the pulmonary vein according to sagittal andcoronal reconstruction process gain. Double the pulmonary vein wassignificantly higher than double lung vein crude (P <0.05). AF groupof left pulmonary vein, left pulmonary vein, right superiorpulmonary vein, right pulmonary vein than in the control group werestatistically significant differences (P values were<0.001,0.025,0.036,0.020).4. Comparison of left atrial volume:through the three-dimensional image reconstruction processmeasured left atrium anatomical data of each group, resulting inthe left atrial volume, by VR image, three-dimensional image showingthe left atrial volume. AF group of left atrial diameter, left atrialdiameter from top to bottom, left atrial anteroposterior diameterand volume of the left atrium were statistically significant (Pvalues were <0.001,0.006,0.001<0.001). CONCLUSION: Left atrial CTA imaging and post-processing imagereconstruction, can be observed in the left atrium and pulmonaryveins morphology and structure, has important clinical value,radiofrequency ablation for atrial fibrillation patients beforesurgery to provide a reference value.