Ensite3000 Measuring The Distance Between Left Atrium And Esophagus And Its Application Study On Catheter Ablation Of Atrial Fibrillation

ObjectivesTo investigate the reliability and feasibility of the Ensite3000 mapping system on measuring the distance between left atrium and esophagus with multi-slice CT as a control, and to guide catheter ablation of atrial fibrillation.MethodsSelected 20 cases of patients with paroxysmal atrial fibrillation from July 2008 to January 2009 at our hospital, measured the distance between the left atrium and the esophagus under multi-slice CT before radiofrequency catheter ablation,measured the distance between left atrium and esophagus under Ensite3000 mapping system during ablation,then compared the relevance. Marked the shortest distance left atrium and esophagus,and operated radiofrequency catheter ablation of atrial fibrillation far away from the left atrial posterior wall or with exclusion of areas adjacent to the esophagus and observed the effect of the strategy.ResultsThe shortest distance between the left atrium and the esophagus measured under multi-slice CT was(3.98±0.56)mm, that measured under Ensite3000 mapping system was(3.15±0.86)mm, Pearson correlation analysis showed that the left atrium the shortest distance between the esophagus was a positive correlation under the both methods of measurement(r = 0.83, P <0.05). The shortest distance between the left atrium and esophagus measured by multi-slice spiral CT was negatively correlated with age (r =- 0.84, P <0.05), history of atrial fibrillation (r =- 0.91, P <0.05), left atrial diameter (r =- 0.94, P <0.05); the shortest distance between the left atrium and esophagus measured by Ensite3000 mapping system was negatively correlated with age (r =- 0.84, P <0.05), atrial fibrillation history (r =- 0.80, P <0.05), left atrial diameter (r =- 0.83, P <0.05); multiple linear regression analysis showed that: history of atrial fibrillation extension, age augment, left atrial diameter increment were the independent predictors of the shorter distance between the left atrium and esophagus. The total operation time of operating radiofrequency catheter ablation of atrial fibrillation far away from the left atrial posterior wall or with exclusion of areas adjacent to the esophagus was shorter [(80.32±12.65) min] compared with the total operation time of other wide range of left atrial catheter ablation [(102.83±34.61) min] and statistically significant (P <0.05), when the ablation cardioversion rate (70%) compared with other ablation strategies (80%) showed no statistical significance (P> 0.05).Conclusion1. Ensite3000 mapping system was feasible and reliable to measure the distance between left atrial esophagus,it confirmed from the side that integration of multi-slice spiral CT image into Ensite3000 was viable and reliable,also demonstrated that operating radiofrequency catheter ablation of atrial fibrillation far away from the left atrial posterior wall or with exclusion of areas adjacent to the esophagus was a viable and reliable strategy in clinic.2. History of atrial fibrillation extension, age augment, left atrial diameter increment were the independent predictors of the shorter distance between the left atrium and esophagus, the shortest distance between the left atrium and the esophagus was prone to be shorter with history of atrial fibrillation extension, age augment, left atrial diameter increment.