Effects of coronary occlusion on blood flows of grafts in patients with right coronary and left anterior descending coronary artery bypass grafting

Abstract

Objective To study the effects of coronary occlusion on blood flows of grafts in patients with right coronary and left anterior descending (LAD) coronary artery bypass grafting(CABGs). Methods Two-hundred and twelve patients with CABGs were sellected from May 2015 to May 2016, 48 patients with occlusion of right coronary and 74 patients without occlusion of right coronary, 50 patients with occlusion of left anterior descending and 162 patients without occlusion of left anterior descending were involved in this study. Transit-time flowmeter(TTFM) was utilized to measure and record the blood flows of grafts, pulsatility index (PI) and diastolic flow (DF). Results The mean blood flows of grafts in patients with or without occlusion of right coronary were (25.81±19.44) and (30.82±23.98) ml/min respectively, and the values of PI were 3.26±2.50 and 2.74±4.17, there were no significant differences between the two groups(P=0.228, P=0.441). The mean blood flows of grafts in patients with or without occlusion of LAD were (33.21±30.81) and (24.70±20.45)ml/min respectively, and the values of PI were 2.62±1.31 and 2.93±3.31, there was no significant difference between the two groups (P=0.067, P=0.441). The percentage of DF in patients with occlusion of right coronary [(61.97±10.61)%] was significant lower than patients without occlusion of right coronary [(66.86±7.85)%, P=0.004], however, there was no significant difference between patients with [(73.34±10.21)%] and without [(75.39±8.09)%] occlusion of LAD(P=0.143). Conclusions There are no effects of coronary occlusion on blood flows of grafts in patients with right coronary and left anterior descending CABGs, and CABGs is an optimal measure for these two kinds of patients. Key words: Blood flows of graft; Occlusion of right coronary; Occlusion of right coronary