THE IMPACT OF GLP-1 RECEPTOR AGONISTS ON PATIENTS WITH DIABETES ON INSULIN THERAPY.

Abstract Objective: The clinical benefit of adding a glucagon-like peptide receptor agonist (GLP-1RA) to basal bolus or very high dose insulin regimens is unclear. This study investigated the impact of adding a GLP-1RA to a spectrum of insulin regimens (basal, basal-bolus, U500) to determine the impact on hemoglobin A1c (HbA1c), weight loss, and total daily insulin dose (TDD) over the course of 12 months. Methods: A retrospective chart review was conducted on 113 participants with Type 2 diabetes mellitus using insulin therapy. Each participant's HbA1c, body weight, and TDD were recorded prior to initiation of GLP-1 RA therapy and at the 3, 6, and 12-month time points while on combination therapy. Results: Across all participants the HbA1c values decreased significantly from baseline of 8.9% (74 mmol/mol) ± 0.14 to 8.2% (66 mmol/mol) ± 0.14 (p<0.01) in the first 3 months, 8.0% (64 mmol/mol) ± 0.12 (p<0.01) at 6 months, to 8.3% (67 mmol/mol) ± 0.14 (p<0.01) at 12 months. There was no significant decrease in weight or TDD with the addition of a GLP-1 RA overall or in different insulin groups. However, there was a clinically significant decrease in weight over the study duration. Conclusion : The results of this study suggest that adding a GLP-1 RA agonist to various insulins regimens may help to achieve glycemic goals while avoiding the less desirable side effects of weight gain and increasing insulin regimens. However, the expected weight loss and decrease in TDD may not be as sizable in the clinical setting.