Objective: The relevance of circMETTL9 to the degree of injury, disturbance of consciousness, cognitive function and prognosis in patients with moderate to severe traumatic brain injury (TBI) remains unknown. The purpose of this study was to investigate the effect of circMETTL9 on the degree of injury, disturbance of consciousness, cognitive function and prognosis after TBI.

1. Collect blood samples from patients with moderate to severe TBI and healthy people, and detect the expression of circMETTL9 by Real-time Quantitative PCR Detecting System(qPCR).Receiver operating characteristic curve (ROC) was used to analyze the sensitivity and specificity of circMETTL9 in TBI patients.
2. Using the Glasgow coma scale (GCS) and the coma recovery scale-revised (CRS-R) to assess the patient's disturbance of consciousness at 1, 3, 7, 14, and 21 days after TBI, respectively, The cognitive function of patients was assessed with the revised Rachel los amigos scale-revised (RLAS-R), and the correlation of circMETTL9 with disturbance of consciousness and cognitive function in TBI patients was analyzed.
3. Six months after TBI, the disability rating scale (DRS) and Glasgow outcome scale-extended (GOSE) were used to evaluate the prognosis of patients six months after discharge, and the correlation between circMETTL9 and prognosis was analyzed. sex.

Inclusion Criteria:

1. Age from 18 to 80 years old, gender is not limited;
2. Have a clear history of TBI and be diagnosed by head CT, and it is the first episode;
3. Glasgow Coma Scale (GCS) score less than or equal to 12;
4. The condition is relatively stable, and there is no serious chronic disease;
5. Obtain informed consent from patients and (or) their families.

Exclusion Criteria:

1 Combined with severe underlying diseases such as respiratory failure, heart failure, liver and kidney insufficiency; previous stroke, intracranial tumor, intracranial infection, dementia, Alzheimer's disease, Parkinson's disease, endocrine disease, immune and blood system diseases.

2. Patients with pelvic fractures, substantial organ damage, etc., which may seriously affect the treatment effect at the time of injury;

TBI patients