Insulin for Hospitalized Patients With Well-Controlled Type 2 Diabetes Mellitus: A Quality Improvement Initiative

Inpatient management of diabetes mellitus (DM) often involves substituting oral medications with insulin which can result in unnecessary insulin use. Attempting to address unnecessary insulin use, a quality improvement initiative implemented a newly developed evidence-based care pathway for inpatient diabetes management focused on patients with recent hemoglobin A1c values < 8% and no prescription of outpatient insulin. This retrospective observational preintervention and postintervention and interrupted time series analysis evaluates this intervention. Over a 21-month time period, there was a significant decrease in mean units of insulin administered per day of hospitalization from 2.7 (2.2-3.3) in the preintervention group to 1.7 (1.2-2.3) in the postintervention group ( p = .017). During the initial 72 hours after admission, a significant downward trend in mean glucose values and mean insulin units per day was seen after the intervention. There was no significant change in hypoglycemic or hyperglycemic events between the two groups. The proportion of patients who received zero units of insulin during their admission increased from 27.7% to 52.5% after the intervention ( p < .001). An evidence-based pathway for inpatient management of DM was associated with decreased insulin use without significant changes in hypoglycemic or hyperglycemic events.