A fundamental aim of coronary surgery is to fashion a perfect anastomosis to deliver blood flow to the ischaemic territories of the myocardium with durable graft patency. However, the ideal designing of coronary revascularization is uncertain, especially in cases with multivessel disease because the competitive flow between the graft and the native vessels, which is closely related to long-term graft patency, is difficult to predict.
The present study was based on CFD models with basic idealized geometry to examine the details of the haemodynamics in patients with coronary artery disease before and after bypass graft procedures.
The result that the simulation of quantitative and systematic haemodynamics based on computational models was feasible and useful for evaluation of the competitive flow and reverse flow of coronary arteries and bypass grafts.

Sachi Koyama, Keiichi Itatani, Tadashi Yamamoto, Shohei Miyazaki, Tadashi Kitamura, Tuyoshi Taketani, Minoru Ono, Kagami Miyaji, "Optimal bypass graft design for left anterior descending and diagonal territory in multivessel coronary disease", Interactive CardioVascular and Thoracic Surgery, 19 (2014) 406–413.