Intraoperative hypotension is common in non cardiac surgery. longer duration of intraoperative hypotension is related with postoperative morbidity and mortality. however, with the change of hypotension criteria, the duration threshold also change. the relationship of different hypotension criteria and its duration is unclear. This study is to explore the their relationship.

Intraoperative hypotension is common in non cardiac surgery. longer duration of intraoperative hypotension is related with postoperative morbidity and mortality. however, with the change of hypotension criteria, the duration threshold also change. the relationship of different hypotension criteria and its duration is unclear. This study is to explore the relationship between continous difference mean blood pressure criteria and its duration thresholds for postoperative major adverse events, which include acute cardiac infarction, heart failure, cardiac death, stroke and acute kidney injury.

Inclusion Criteria:

adults underwent elective non-cardiac surgery

Exclusion Criteria:

cardiac surgeries; kidney surgeries; obstetric surgeries; local infiltration anesthesia; surgeries without arterial pressure monitoring; perioperative data missing; patients with more than one operation within a year

The analysis set of this study was adults (age ≥ 18 years old) who underwent elective non-cardiac surgery from January 1, 2012, to December 31, 2017.