Results
General data-related indicators are shown in Table
1.
These indicators were found to have no significant effect on the flow of
vascular grafts.
In this study, all patients clearly showed the IMA lumen and flow
spectrum (100%) at the fourth intercostal space next to the sternum.
The preoperative IMA flow spectrum showed systolic dominance, and the RI
was high (Fig. 1a). Luminal diameter of postoperative IMA was wider than
that of preoperative IMA. The postoperative PSV and PDV of IMA were
significantly increased. The postoperative RI of IMA was reduced. The
postoperative dVIT and dVITF of IMA were significantly increased (Table
2). Indicators of left ventricular function (such as EDV and SV) and
blood flow between patients on- and off-pump during CABG have no
significant difference (P > 0.05, Table 3).
Logistic regression analysis showed that the angle of the IMA and left
subclavian artery was negatively correlated with the intraoperative
vascular graft flow (= −1.88 × Angle + 344.13, P = 0.00,
R2 = 0.23, Fig. 2). The vascular graft flow in at 1
week after surgery was significantly higher than the intraoperative
vascular graft flow (P = 0.00, Table 4). All patients showed
clinical improvement after surgery, but there was no significant
difference in left ventricular function indicators.