Restoration of sinus rhythm and atrial transport function after the maze procedure: U lesion set versus box lesion set Takashi Nitta, MD, PhD, Yosuke.

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Date of download: 9/18/2016 Copyright © The American College of Cardiology. All rights reserved. From: Comparison of Radiofrequency Catheter Ablation of.

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Restoration of sinus rhythm and atrial transport function after the maze procedure: U lesion set versus box lesion set Takashi Nitta, MD, PhD, Yosuke Ishii, MD, PhD, Masahiro Fujii, MD, PhD, Yasuo Miyagi, MD, PhD, Shun-Ichiro Sakamoto, MD, PhD, Atsushi Hiromoto, MD, Hajime Imura, MD, PhD The Journal of Thoracic and Cardiovascular Surgery Volume 151, Issue 4, Pages 1062-1069 (April 2016) DOI: 10.1016/j.jtcvs.2015.10.108 Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

Figure 1 The schemas represent the anterior and posterior views of the atria, along with the right atrial septum at the bottom. While the bilateral PV isolation and ablation lines at the LA roof and bottom forms the Box-lesion set and isolates the entire posterior LA, the LA roof between the right and left superior pulmonary veins is not ablated to allow the activation to propagate into the posterior LA and to recruit this segment as a contractile atrial component in the U-lesion set. MV, Mitral valve; TV, tricuspid valve; LAA, left atrial appendage; RAA, right atrial appendage; CS, coronary sinus; SVC, superior vena cava; IVC, inferior vena cava; STL, septal tricuspid leaflet; FO, fossa ovalis; RF, radiofrequency. The Journal of Thoracic and Cardiovascular Surgery 2016 151, 1062-1069DOI: (10.1016/j.jtcvs.2015.10.108) Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

Figure 2 Kaplan-Meier curves of postoperative freedom from AF after the maze procedure with U-lesion and Box-lesion set in LSP AF patients. The confidence limits are shown as shaded areas in the graph and the number of patients at risk at the bottom. AF, Atrial fibrillation. The Journal of Thoracic and Cardiovascular Surgery 2016 151, 1062-1069DOI: (10.1016/j.jtcvs.2015.10.108) Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

Figure 3 Kaplan-Meier curves of postoperative freedom from AF after the maze procedure with U-lesion and Box-lesion set in PAF patients. The confidence limits are shown as shaded areas in the graph and the number of patients at risk at the bottom. AF, Atrial fibrillation. The Journal of Thoracic and Cardiovascular Surgery 2016 151, 1062-1069DOI: (10.1016/j.jtcvs.2015.10.108) Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

Figure 4 The peak A/E after the maze procedure with U-lesion and Box-lesion set was plotted in association with preoperative LAD. A/E, Ratio of velocity of the A wave to the E wave; LAD, left atrial diameter. The Journal of Thoracic and Cardiovascular Surgery 2016 151, 1062-1069DOI: (10.1016/j.jtcvs.2015.10.108) Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions

Schemas of the U lesion set and box lesion set. The Journal of Thoracic and Cardiovascular Surgery 2016 151, 1062-1069DOI: (10.1016/j.jtcvs.2015.10.108) Copyright © 2016 The American Association for Thoracic Surgery Terms and Conditions