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Ann Thorac Surg 2001;71:1485-1490
© 2001 The Society of Thoracic Surgeons
a Department of Cardiovascular Surgery, Kumamoto Central Hospital, Kumamoto City, Japan
b Department of Cardiology, Kumamoto Central Hospital, Kumamoto City, Japan
c Department of Pathology, Kumamoto Central Hospital, Kumamoto City, Japan
Accepted for publication January 15, 2001.
Address reprint requests to Dr Ura, Department of Cardiothoracic Surgery, St. George Hospital, Gray St, Kogarah, NSW 2217, Australia
e-mail: masashiura{at}hotmail.com
Background. Little is known about the anatomic limitations of in situ right internal thoracic artery (RITA) grafting to the circumflex artery.
Methods. To evaluate the technical aspects and outcome of revascularization of the proximal and distal major branches of the circumflex artery (obtuse marginal [OM] branch and posterolateral [PL] branch), a total of 145 patients who possessed a graftable branch of the circumflex artery were enrolled into the prospective project. There were 73 patients who had the PL branch as a primary target and 72 patients with OM branches, which were allocated by a blinded observer who reviewed the preoperative angiography.
Results. Changes of primary target vessels were required in 9 patients (6.2%), yielding an overall success rate of RITA grafting of 93.8%. The success rates of RITA grafting to the OM branch and the PL branch were 95.8% (69/72; CI 88.3% to 99.1%) and 91.7% (67/73; CI 83.0% to 96.9%), respectively. The univariate analysis identified grafting under hypothermic ventricular fibrillation as predictors of inability to use in situ RITA grafting for revascularization of the circumflex artery. RITA grafting to the PL branch is not identified as a predictor. Postoperative angiography in 136 patients revealed only one occlusion (0.75%) of the RITA graft anastomosed to the marginal artery. There were no significant differences in patency rates between left and right ITA grafts.
Conclusions. This prospective study showed that in situ RITA was, in most cases, able to reach most branches of the major circumflex artery and demonstrated an excellent patency rate.
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