Comparison of A1c Reduction, Weight Loss, and Changes in Insulin Requirements With Addition of GLP-1 Agonists vs SGLT-2 Inhibitors in Patients Using Multiple Daily Insulin Injections

Objective: To determine whether Glucagon-Like Peptide 1 (GLP-1) agonists or Sodium Glucose Transporter 2 (SGLT-2) inhibitors result in greater A1c reduction, weight loss, and reduction of insulin requirements in veterans using multiple daily doses of insulin. Methods: This retrospective, single-site, cohort study included patients of VA Eastern Kansas Health Care System with a diagnosis of Type II Diabetes utilizing multiple daily dose insulin and an SGLT-2 inhibitor or GLP-1 agonist. SAS Enterprise Guide was utilized to complete a multivariate analysis of variance to evaluate all outcomes. Key Findings: 150 patients met selection criteria. The GLP-1 group averaged a .65% reduction in A1c compared to a 1.05% reduction in the SGLT-2 group (P = .1397). The Basal insulin dose was reduced by 5.5 units in the GLP-1 group vs 2.45 units in the SGLT-2 group (P = .3132), and 7.12 units vs 8.14 units respectively for short-acting insulin (P = .8170). The resulting weight reduction was 4.1 Kg in the GLP-1 group compared to 3.6 Kg in the SGLT-2 group (P = .6993). Conclusion: The results suggest there is not a statistically significant difference in changes to A1c, insulin requirements, or weight after 1 year of treatment with an SGLT-2 vs GLP-1 in patients using multiple daily insulin injections.