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| The role of multi-detector row CT before radiofrequency catheter ablation of atrial fibrillation |
| JIN Biao, WANG Qun-shan, XUE Jian-ping, ZHU Li-hua, ZHANG Yong-ping, LI Yu-hua, ZHU Ming |
| Department of Radiology, Xinhua Hospital, Medical College of Shanghai Jiaotong University, Shanghai 200092, China |
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Abstract Objective: To evaluate the role of multi-detector row computed tomography(MDCT) in the treatment of atrial fibrillation by radiofrequency catheter ablation. Methods: The MDCT materials of 52 patients[27 men, 25 women; mean age, (68±11)years] with atrial fibrillation underwent radiofrequency ablation were analyzed retrospectively. MDCT was done before radiofrequency catheter ablation surgery. The variation of the pulmonary veins, the shape and the diameter of the ostia of the pulmonary veins were depicted and calculated. Results: Thirty-nine(75%) had two ostia on the right side. Nine(17%) had three to four ostia on the right side due to separate middle lobe vein. Four(8%) had a single ostium(common ostia). Forty-two(80%) had two ostia on the left side. Eight(15%) had a single ostium(common ostia). Mean pulmonary vein diameters at the ostia were variable: right superior, (12.5±2.4)mm; left superior，(11.6±2.1)mm; right inferior, (13.2±2.0)mm; left inferior, (10.6±2.1)mm. Caliber of the left inferior pulmonary vein decreased as it entered the left atrium. Ostia of the right pulmonary veins were more round than were ostia of the left pulmonary veins(pulmonary vein ostium index, 0.89±0.20 vs 0.74±0.16, P<0.05). Conclusion: Multi-detector row CT provides a valuable road map for pulmonary vein anatomy prior to radiofrequency catheter ablation. Pulmonary venous drainage pattern, shape and diameter vary.
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Received: 15 June 2007
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2008, Vol. 19 
