Study parameters
To investigate the influence of pre- and intraoperative variables on
30-day mortality, various parameters deemed relevant were tested in the
statistical analysis (tables 1-2). Preoperative
parameters covered demographics,
echocardiographic measurements, vessel involvement and laboratory
results, while operative parameters included procedure type and duration
of procedure. The 30-day mortality included any death occurring from the
intraoperative period through the 30th postoperative day. The study was
approved by the institutional ethics board of Union Hospital Tongji
Medical College, Huazhong University of Science and Technology.