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Myocardial revascularization with the left internal thoracic artery Y graft configuration
1Department of Cardiothoracic Surgery, Westmead Hospital, Sydney, Australia.
Background:
The proved long-term patency of the left internal thoracic artery (LITA) has made it the conduit of choice for myocardial revascularization. Maximal utilizable LITA length can be achieved by using a semiskeletonizing harvest technique. Expanded LITA use with sequential and Y graft techniques allows for a wider territory of myocardial revascularization.
Methods:
A retrospective analysis of 30 patients undergoing coronary artery bypass surgery with a LITA-Y graft between December 1994 and November 1996 was performed. In selected patients the LITA was cut to length and anastomosed to the left anterior descending artery (LAD), with the redundant length of LITA used as a free graft to the lateral circumflex and diagonal systems. The proximal end of the free LITA was anastomosed to the in situ LITA to form the Y graft. Selection criteria included: a) minimal distal disease in the LAD and circumflex systems; and b) graftable circumflex branches proximal to the mid free wall of the left ventricle, allowing total revascularization of the left coronary system with the Y graft.
Results:
Thirty patients (22 male, 8 female) underwent the LITA-Y graft procedure. There were no deaths or episodes of myocardial infarction. One patient required inotropic and intraaortic balloon pump support. Two patients with isolated coronary ostial stenosis developed recurrence of angina due to occlusion of the free limb of the LITA.
Conclusions:
In patients with suitable coronary artery anatomy, the LITA-Y graft can be successfully performed with good short-term outcome, but may be contraindicated in the management of isolated coronary ostial stenosis.