Chronic totally occluded right coronary artery (CTO-RCA) often poses a problem in decision making for/against bypass grafting due to the lack of standardized indication criteria. The aim of the study was to investigate whether qualitative angiograms can be useful in decision making for/against surgical revascularization of CTO-RCA. A retrospective cohort study was conducted with 69 patients who underwent elective CABG procedure, including single graft to the RCA. The distal run-off of the bypassed RCA was measured intraoperatively using the ultrasonic transit-time method. As a primary endpoint of the study, the flow values were analysed in regard to diameter of the recipient artery. As a secondary endpoint, the correlations between the regional and global LV function, Rentrop grading, type of collateral pathway, number of donor sources, comorbidity, and the graft flow and the diameter of the recipient artery were investigated using uni- and multi-variate regression analyses. In general, the flow values correlated significantly with the diameter of the recipient artery. Significantly lower flow (p
