The decision to operate and surgical timing on multi-trauma patients remains controversial, inappropriate surgical timing may cause more complications which lead to poor prognosis. We hope to find out the connection between lactate and prognosis in multi-trauma patients, and the optimal timing of definitive treatment.

The decision to operate and surgical timing on multi-trauma patients remains controversial, inappropriate surgical timing may cause more complications which lead to poor prognosis.

The aim of our study is to analyze if serum lactate a predictive factor of optimal surgical timing in multi-trauma patients. In order to obtain more accurate data, we choose to utilize ili database and trauma database instead of National Health Insurance Research Database.

Multi-trauma patients from 2002 through 2022 were included to our study. We hope to find out the connection between lactate and prognosis in multi-trauma patients, and the optimal timing of definitive treatment.

Inclusion Criteria:

• (1) Injury severity score(ISS) > 16 with pelvicfracture or long bone fracture requiring surgical fixation (2) Patient age ≥ 20. Pathologic fracture was excluded. Our primary endpoint si mortality rate, secondary endpoints include ICU stay, ICU complications (Sepsis, Pneumonia, Multiple organ failure)

Exclusion Criteria:

• death before into undergoing surgery

pelvic fracture patients