Intraoperative transit time flow measurement to predict clinical outcomes in patient undergoing on pump coronary artery bypass graft

Background: Transit time flow measurement (TTFM) is used for intraoperative graft measurement to estimate graft failure. PI≤3 was suggested because it shows lower incidence of early graft failure. Objective of the study was to compare myocardial function and clinical outcomes of patients who underwent coronary artery bypass graft (CABG) surgery, between PI≤3 in all grafts (optimal group) and PI >3 in one or more grafts (suboptimal group) by Transit time flow measurement (TTFM).Methods: 90 patients who underwent CABG since June 2012 to December 2014 were included. Patients were classified into 2 groups: Optimal group (n=32) and Suboptimal group (n=58). CABG with intraoperative TTFM was performed as standard. Postoperative outcomes of both groups were compared.Results: Patients whose postoperative EF was increased were found in optimal group more than suboptimal group (62.1% vs 25%, p<0.001). The patients whose postoperative EF increased equal or more than 5% was found in optimal group more than suboptimal group (73.2% vs 25%, p=0.002). Suboptimal group found one patient with myocardial infarction but optimal group found none (3.13% and 0%). Postoperative atrial fibrillation and prolong ventilator more than 48 hours were found in suboptimal group more than optimal group (43.75% vs 37.93%, 62.50% vs 37.93%). In midterm, postoperative follow-up, all-cause mortality in suboptimal group was higher than optimal group (3.13% vs 1.72).Conclusions: Optimal group had patients whose postoperative EF significantly increased more than suboptimal group. Tendency of finding postoperative complications in suboptimal group was more than in optimal group.