In-Hospital Diabetes Management by a Diabetes Team and Insulin Titration Algorithms Based on Continuous Glucose Monitoring or Point-of-Care Glucose Testing in Patients With Type 2 Diabetes (DIATEC): A Randomized Controlled Trial

OBJECTIVE The DIATEC trial investigates the glycemic and clinical effects of inpatient continuous glucose monitoring (CGM)–guided insulin titration by diabetes teams. RESEARCH DESIGN AND METHODS This two-center trial randomized 166 non–intensive care unit patients with type 2 diabetes. Diabetes management was performed by regular staff, guided by diabetes teams using insulin titration algorithms based on either point-of-care glucose testing or CGM. The primary outcome was the difference in time in range (TIR) (3.9–10.0 mmol/L) between the two arms. Outcomes were assessed during hospitalization. RESULTS The CGM arm achieved a higher median (interquartile range [IQR]) TIR of 77.6% (24.4%) vs. 62.7% (31.5%) in the POC arm (P < 0.001). Median (IQR) time above range (TAR) >10.0 mmol/L was lower in the CGM arm at 21.1% (24.8%) vs. 36.5% (30.3%) in the POC arm (P = 0.001), and time below range (TBR) <3.9 mmol/L was reduced by CGM, with a relative difference to POC of 0.57 (95% CI 0.34–0.97; P = 0.042). Prolonged hypoglycemic events decreased (incidence rate ratio [IRR] 0.13; 95% CI 0.04–0.46; P = 0.001), and the mean (SD) coefficient of variation was lower in the CGM arm at 25.4% (6.3%) vs. 28.0% (8.2%) in the POC arm (P = 0.024). Mean (SD) total insulin doses were reduced in the CGM arm at 24.1 (13.9) vs. 29.3 (13.9) IU/day in the POC arm (P = 0.049). A composite of complications was lower in the CGM arm (IRR 0.76; 95% CI 0.59–0.98; P = 0.032). CONCLUSIONS In-hospital CGM increased TIR by 15 percentage points, mainly by reducing TAR. CGM also lowered TBR, glycemic variability, prolonged hypoglycemic events, insulin usage, and in-hospital complications.