Outcomes of “Real-World” Insulin Strategies in the Management of Hospital Hyperglycemia

Abstract

Abstract Context Guidelines recommend scheduled long-acting basal and short-acting bolus insulin several times daily to manage inpatient hyperglycemia. In the “real world,” insulin therapy is complicated, with limited data on the comparative effectiveness of different insulin strategies. Objective This work aimed to evaluate the association of different insulin strategies with glucose control and hospital outcomes after adjustment for patient and physician factors that influence choice of therapy. Methods This retrospective, observational study took place at an academic hospital. Participants included noncritically ill hospitalized medical/surgical patients (n = 4558) receiving subcutaneous insulin for 75% or longer during admission. Insulin therapy was grouped into 3 strategies within the first 48 hours: basal bolus (BB: scheduled long and short/rapid n = 2358), sliding scale (SS: short/rapid acting n = 1855), or basal only (BO: long only: n = 345). Main outcome measures included glucose control: hypoglycemic days, hyperglycemic days, euglycemic days, mean glucose; and hospitalization: in-hospital mortality, length of stay (LOS), and readmissions. Results Initial therapy with BB was associated with more hypoglycemic (2.40; CI, 2.04 to 2.82) (P < .001) and fewer euglycemic days (0.90; CI, 0.85 to 0.97) (P = .003) than SS, whereas BO was associated with fewer hyperglycemic days (0.70; CI, 0.62 to 0.79) (P < .001), lower mean glucose (–18.03; CI, –22.46 to –12.61) (P < .001), and more euglycemic days (1.22; CI, 1.09 to 1.37) (P < .001) compared to SS. No difference in mortality, LOS, and readmissions was found. However, decreased LOS was observed in the BB subgroup with a medical diagnostic related group (0.93; CI, 0.89 to 0.97) (P < .001). Conclusion BO had a more favorable hyperglycemia profile than SS. BB, on the other hand, showed worse glycemic control as compared to SS. In the real-world hospital, BO may be a simpler and more effective insulin strategy.