Early results (≤ 30 days)
primary outcome
Mortality at 30-days was observed in 15 (3.9%) cases: it was not different among enrolling centers (3.8% vs . 3.0% vs . 5.7%, p = 0.632) and quartile of study (3.9% vs . 0.0%vs . 5.5% vs . 2.8%, P = 0.431). Five covariates were associated with the primary outcome as reported in Table 2 : however, binary logistic regression analysis identified that 30-days mortality was associated with preoperative left heart insufficiency (OR: 5.44, 95%CI: 1.63-18.17, p = 0.006), and postoperative stroke (OR: 197.11, 95%CI: 18.28-2124.93, p < 0.001). The ROC analysis (AUROC: 0.77, 95%CI: 0.64-0.91) had reasonably good discrimination for the obtained multivariate model (Figure 1 ).