Based on a review of about 10,000 patients undergoing cardiac surgery under CPB in West China Hospital of Sichuan University and the Second Affiliated Hospital of Zhejiang University, we try to evalute the effect of blood transfusion on outcomes in cardiac surgery.

Based on a review of about 10,000 patients undergoing cardiac surgery under CPB in West China Hospital of Sichuan University and the Second Affiliated Hospital of Zhejiang University, the following results were obtained:

1. Perioperative risk factors of death and complications of different organ systems after cardiac surgery, providing evidence for early prevention and intervention;
2. Risk factors of blood transfusion risk were analyzed to provide ideas for reducing intraoperative blood transfusion;
3. The relationship between hemoglobin and complications after heart surgery was explored to provide a factual basis for the development of blood transfusion indications for such patients

Inclusion Criteria:

• The patients in the west China hospital of sichuan university (July 01, 2011, solstice during June 30, 2017) and the second affiliated hospital of zhejiang university (September 01, 2013, solstice, June 30, 2017) have cardiac surgery under Cardiopulmonary bypass (CPB)

Exclusion Criteria:

• No

The patients in the west China hospital of sichuan university (July 01, 2011, solstice during June 30, 2017) and the second affiliated hospital of zhejiang university (September 01, 2013, solstice, June 30, 2017) have cardiac surgery under Cardiopulmonary bypass (CPB)