Baseline patient characteristics
A total of 823 consecutive patients with HCM were included in this study (500 male patients, 60.8%; mean age, 45.2±13.8 years). In the cohort, 203 patients (24.7%) had MB, and 620 (75.3%) patients had no MB. The baseline characteristics of the entire population and subgroups based on the presence or absence of MB are described in Table 1. The non-MB group contained more females and the patients were older. The MB group had a higher prevalence of chest pain than the non-MB group (23.4% vs 36.9%, p<0.001). Detailed information is presented in Table 1.
Perioperative data among the different groups
Patients with MB were divided into three groups, namely, CABG group (n=90), myocardial unroofing group (n=52), and untreated group (n=61). The perioperative period was defined as within 30 days after the operation. Compared with other groups, the myocardial unroofing group had a longer cardiopulmonary bypass time and aortic cross-clamping time. In addition, the degree of arterial compression was higher in the myocardial unroofing group than in the CABG and untreated groups. However, there was no difference between the CABG and untreated groups. The length of MB was longer in the CABG group than in the unroofing and untreated groups, and 3 patients died of heart failure during the perioperative period. There was no difference between the unroofing and untreated groups. The postoperative hospital stays and postoperative ventilation time did not differ among the different groups. Most importantly, no difference was found between the three groups regarding perioperative death and the concomitant procedure (Table 2).