3.1 Intergroup Comparison of Patient Characteristics and Operative Data
Of the 128 patients, PPM was noted in 34 patients (26.6%) at discharge. The baseline preoperative patient characteristics per group are shown in Table 1. Compared with the non-PPM group, the PPM group showed a higher proportion of males (PPM: 70.6%, non-PPM: 46.8%, p = .027), larger BSA (PPM: 1.60 ± 0.18, non-PPM: 1.48 ± 0.17, p < .001), a higher prevalence of cerebrovascular disease (PPM: 41.2%, non-PPM: 22.3%, p = .044), but a lower prevalence of endocarditis/PVE (PPM: 0%, non-PPM: 17.0%, p = .006). The operative data are shown in Table 2. There was no significant difference between the PPM and non-PPM patients regarding operative status and valve size distribution (Table 2). Implanted valve types were similar between the PPM and non-PPM patients (St Jude Medical Epic, 64.7% vs. 53.2%, p = .31, Magna Mitral, 20.6% vs. 29.8%, p = .37, Mosaic Mitral, 14.7% vs.17.0%, p = 1.000). Everting mattress suture was used in 17 patients with PPM and 48 patients with non-PPM, whereas the non-everting mattress procedure was used in 17 patients with PPM and 46 patients with non-PPM (p = 1.000).