High-quality studies
The overall quality of studies is summarized in supplementary table 1.
Of 11 included studies, 6 were rated as high-quality (≥ 10 points).
Subgroup analysis of the high-quality studies revealed no significant
between-group difference in terms of the primary outcomes late mortality
and recurrence (IRR: 0.47 [95% CI: 0.07–3.07], p = 0.43; IRR:
1.47 [95% CI: 0.09-25.5], p=0.78, respectively) (supplementary
figure 1,2); CPB and CC time were significantly longer in the MI group
yet no effect on post-operative outcome was noted (supplementary table
2).