Data extraction and analysis
All data were collected independently by two investigators (WMH and QL)
from eligible studies using a standardised form. The following
information was extracted: (1) study identification, including author
name and publication year; (2) country where the study was conducted;
(3) study subjects, number of participants and male to female ratio; (4)
settings of trial arms; (5) Main indicators: complications, blood
transfusion rate, 30-day mortality; mitral regurgitation and
paravalvular leakage; secondary indicators: operation time, mechanical
ventilation time, chest drainage, physiological score, psychological
score, recovery time, hospitalization Total cost. (The ”complication”
here refers to postoperative wound infection, pneumonia, liver and
kidney insufficiency, myocardial infarction, postoperative atrial
fibrillation, stroke, secondary thoracotomy, etc., ”Physiological score
or Psychological score” is a score determined according to the quality
of life questionnaire (SF-12/SF-36) provided in the literature. The
higher the score, the better the effect.)