Abstract:Objective To explore the effect of Metformin combined with subcutaneous injection of insulin pump on serum YKL-40 protein and irisin in treatment of gestational diabetes mellitus (GDM). Methods Totally 140 cases of GDM patients admitted from July 2015 to January 2017 were randomly divided into an observation group (70 cases) and a control group (70 cases). The patients in the observation group were treated with Metformin combined with subcutaneous injection of insulin pump, while the patients in the control group were treated with Metformin combined with subcutaneous injection of insulin. After 12 weeks, the clinical efficacy and changes of serum YKL-40 protein and irisin levels were compared. Results The total effective rate of the observation group was higher than that of the control group (P < 0.05). The blood glucose compliance time in the observation group was shorter than that in the control group (P < 0.05). And the insulin dosage, blood glucose-related indicators (TC, TG, LDL-C, FPG, FBG and HbAlc) and serum YKL-40 protein level after treatment in the observation group were lower than those in the control group (P < 0.05). The serum irisin after treatment in the observation group was higher than that in the control group (P < 0.05). The incidence of abnormal pregnancy rate in the observation group was lower than that in the control group (P < 0.05), and the incidence of abnormal neonatal outcome rate in the observation group was lower than that in the control group (P < 0.05). Conclusions For the treatment of gestational diabetes, Metformin combined with subcutaneous injection of insulin pump is superior to Metformin combined with subcutaneous injection of insulin with significant effect in the control of blood sugar level and reduction of complications. It can reduce serum YKL-40 protein level, increase the level of irisin, improve insulin resistance and islet β-cell function,. and is of great value for the treatment of GDM.