Abstract:Objective To investigate and analyze the clinical characters and prognostic values of miR-374a-5p in the patients with mixed DVT. Methods The median of miR-374a-5p expression level before treatment was used as the critical value to divide patients into high expression group and low expression group, with 40 cases in each group. At the same time, the expression levels of miR-374a-5p in 60 healthy subjects were used as control group. Both groups of patients were treated with anterior tibial vein thrombolysis, the general information and degree of swelling of the affected limb, thrombus clearance, venous patency, complications during treatment, and the incidence of long-term follow-up PTS were compared between the two groups. Results The expression level of miR-374a-5p in patients with DVT was significantly higher than the healthy controls (P?0.05). The age, first symptom to treatment time of the high expression group was significantly greater than those of the low expression group, and the proportion of patients with orthopedic diseases in the high expression group was significantly higher than that in the low expression group (P?0.05). After treatment, the difference of the diameter between the healthy side and the leg was reduced in both groups, but the rate of apocatastasis and the venous patency scores of the affected leg and the rate of thrombus removal were not statistically significant (P?>?0.05). The incidence of complications was 15.0% and 17.5%, respectively (P?> 0.05). After two years of follow-up, the incidence of PTS in the high expression group was 55.0% (22/40), which was significantly higher than that in the low expression group 32.5% (13/40), and the severity of PTS in the high expression group was significantly greater than that in the low expression group (P?< 0.05). Conclusion miR-374a-5p is highly expressed in patients with mixed DVT, and its expression is different in age, first symptom to treatment time and surgical history of orthopedic diseases. High expression of miR-374a-5p will increase the incidence of long-term PTS rate and severity in patients.