The purpose of this study is to observe the relationship between the level of lipid peroxidation products in serum of patients with traumatic brain injury and secondary coagulation disorders.

Uncontrolled hemorrhage after trauma is the leading cause of death. The mechanism of secondary coagulation dysfunction after trauma is special and complex, which has not been fully explained, leading to limited treatment and prevention methods. Coagulation disorders caused by traumatic brain injury is a systemic manifestation of local injury, which can activate platelets and promote platelet aggregation, activate thrombin, and promote the production of fibrin, leading to the formation of thrombosis. However, in non-injured areas, pro-coagulant molecules from damaged brain tissue reach the body through the broken blood-brain barrier, and also activate platelets and thrombin, promoting the formation of blood clots. Lipid peroxidation products are closely related to the occurrence of coagulation dysfunction. The effects lipid peroxidation products on platelets, thrombin and anticoagulant pathways may be a novel mechanism of secondary coagulation dysfunction in traumatic brain injury.

Inclusion Criteria:

1. The interval between injury and admission is less than 24 hours
2. Age>18yrs and age<80yrs
3. Non-head abbreviated injury score < 3
4. Did not undertake treatment before enrollment
5. Informed consent to participate in the study

Exclusion Criteria:

1. Take anticoagulants or antiplatelet drugs
2. Smoking history
3. Hemorrhagic or ischemic cerebrovascular disease occurred within six months
4. Other systemic diseases: uremia, cirrhosis, malignant tumor, etc
5. Patients with severe mental illness who are unable to communicate when diagnosed
6. Patients who refused follow-up

All of the traumatic brain injury patients receiving treatment in Tangdu Hospital during 2019-2020