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Assessment of left internal mammary artery to left anterior descending flow in composite arterial bypass grafting

Objectives The aim of the study was to achieve arterial myocardial revascularization using the ′Y-graft or T-graft′ techniques and to measure intraoperative graft flow by transit-time flowmetry. Background Composite grafting techniques for coronary artery bypass grafts have been widely used. However, it remains unclear whether this technique provides similar blood flow to the left coronary artery. In this study, we evaluated composite grafting techniques by intraoperative measurement graft flow by transit-time flowmetry. Materials and methods Fifty patients who underwent coronary artery bypass grafting during a time period of 24 months were enrolled in this prospective study. All patients received sequential grafting using both internal thoracic arteries and left radial artery joined as a composite Y or T graft. Intraoperative left internal mammary artery (LIMA) flow was measured by transit-time flowmetry. Results This study provided evidence that the LIMA limb of a composite Y or T graft had intraoperative increase in mean flow, and there was statistical significance (P < 0.01) between mean flow with clamping Y or T graft (41.72 ± 15.59 ml/min) and with patent Y or T graft (78.60 ± 29.58 ml/min). Conclusion LIMA has the potential to provide sufficient blood flow to revascularize left coronary system.