National trends in utilization of glucose lowering medicines by older people with diabetes in long-term care facilities

Aims To examine national trends in glucose lowering medicine (GLM) use among older people with diabetes in long-term care facilities (LTCFs) during 2009–2019. Methods A repeated cross-sectional study of individuals ≥65 years with diabetes in Australian LTCFs (n = 140,322) was conducted. Annual age-sex standardised prevalence of GLM use and number of defined daily doses (DDDs)/1000 resident-days were estimated. Multivariable Poisson or Negative binomial regression models were used to estimate adjusted rate ratios (aRRs) and 95 % confidence intervals (CIs). Results Prevalence of GLM use remained steady between 2009 (63.9%, 95 %CI 63.3–64.4) and 2019 (64.3%, 95 %CI 63.9–64.8) (aRR 1.00, 95 %CI 1.00–1.00). The percentage of residents receiving metformin increased from 36.0% (95 %CI 35.3–36.7) to 43.5% (95 %CI 42.9–44.1) (aRR 1.01, 95 %CI 1.01–1.01). Insulin use also increased from 21.5% (95 %CI 21.0–22.0) to 27.0% (95 %CI 26.5–27.5) (aRR 1.02, 95 %CI 1.02–1.02). Dipeptidyl peptidase-4 inhibitor use increased from 1.0% (95 %CI 0.9–1.1) to 21.1% (95 %CI 20.7–21.5) (aRR 1.24, 95 %CI 1.24–1.25), while sulfonylurea use decreased from 34.4% (95 %CI 33.8–35.1) to 19.3% (95 %CI 18.9–19.7) (aRR 0.93, 95 %CI 0.93–0.94). Similar trends were observed in DDDs/1000 resident days. Conclusions The increasing use of insulin and ongoing use of sulfonylureas suggests a need to implement evidence-based strategies to optimise diabetes care in LTCFs.