A Long-Term Retrospective Real-World Evidence to Understand the Pattern of Insulin Prescription in Patients with Type 2 Diabetes Mellitus: Evaluating the Role of Insulin Initiation

Abstract Aims and Objective: To evaluate the prescription pattern of insulin and oral antidiabetic drugs (OADs) and the trend of glycemic control in people with diabetes (PwD) with type 2 diabetes mellitus attending a tertiary care center in India. Materials and Methods: This retrospective, cross-sectional observational study included clinic records of 647 PwD collected at three different time points (2011, 2015, and 2019). Population characteristics, patterns of glycemic parameters, and trends of antidiabetic medication were analyzed. Results: PwD population was similar in terms of anthropometric and clinical variables. Dysglycemia was observably higher in the 2015 population (mean HbA1C = 8.37 ± 1.8%) compared with the 2011 population (6.4 ± 0.4%) and stabilized in the 2019 population (8.35 ± 1.9%) compared with the 2015 population. This correlated with the trend of increase in basal and bolus insulin prescriptions as more subjects were initiated on insulin to address the higher dysglycemia in 2015 than in 2011 and were later titrated in 2019. The proportion of subjects with uncontrolled diabetes increased marginally in 2015 (50.9%) compared with 2011 (45.6%) and decreased significantly in 2019 (34.1%) compared with 2015. This correlated with the additive increases of premix insulin, sodium-glucose transport protein 2 inhibitors (SGLT2i), and dipeptidyl peptidase 4 inhibitors (DPP4i) prescriptions. Conclusion: We observed a judicious usage of insulin prescriptions correlating with the higher need for PwD to be initiated with basal insulin to counter the increasing trend of dysglycemia, followed by more premix insulin prescriptions to address stabilized dysglycemia. Optimal diabetes control can be partly attributed to dysglycemia stabilization by insulin initiation and usage of newer OADs, such as SGLT2i and DPP4i.