Cardiac surgery
The septal myectomy procedure has been described in detail in our previous publication.8 Indications for MB intervention mainly include chest pain and the degree and length of compression of MB. In addition, the operative procedure is mainly determined by the degree and length of compression. For patients with relatively shallow and short MB, myocardial unroofing was performed. However, for those with deep and extensive MB, CABG was conducted. Moreover, MB was not treated for patients with no symptoms of chest pain and with shallow and short MB. After septal myectomy and aortic incision suturing, we performed myocardial unroofing under the circumstance of cardiac arrest. First, we determined the position of the MB and then cut the epicardium right above the coronary artery and maintained its integrity (Figure 2). After this unroofing, 6-0 Prolene was used to continuously suture the adipose tissue on the surface of the heart. CABG was performed according to previous studies, and other related operations performed according to preoperative evaluation and intraoperative exploration. Two grafts, namely, LIMA and SVG, were used in all CABG procedures.