Long-term clinical and cost-effectiveness of collaborative care in people with uncontrolled type 2 diabetes mellitus and polypharmacy: A multicenter randomized controlled trial

Clinical activities that contributed to the effectiveness of a cardiologist-pharmacist collaborative care model in managing diabetes

OBJECTIVES

The primary objectives of this study were to evaluate the change in glycated haemoglobin (HbA1c) and its association to clinical activities. The secondary objective was to elucidate moderators of the relationship between pharmacist-involved collaborative care (PCC) and change in HbA1c.

METHODS

This study was a retrospective cohort study conducted in a tertiary hospital over 12 months. Individuals with Type 2 diabetes, aged ≥21 years with established cardiovascular diseases were included while individuals with incomplete care documentation or missing data related to cardiovascular diseases were excluded. Individuals under the care of PCC were matched 1:1 based on baseline HbA1c with an eligible person who received care from the cardiologists (CC). Changes in mean HbA1c were analysed using linear mixed model. Linear regression was used to determine clinical activities that associated with improvement in HbA1c. Moderation analyses were conducted using the MacArthur framework.

KEY FINDINGS

A total of 420 participants (PCC:210, CC:210) were analysed. The mean age of the participants was 65.6 ± 11.1 years, with the majority being male and Chinese. The mean HbA1c among participants in the PCC group decreased significantly after 6 months (PCC: -0.4% versus CC: -0.1%, P = 0.016), with maintenance of improvement at 12 months (PCC: -0.4% versus CC: -0.2%, P < 0.001). Frequencies of lifestyle counselling, reinforcement of visits to healthcare providers, health education, resolution of drug-related problems, emphasis on medication adherence, dose adjustments and advice on self-care techniques were significantly higher in the intervention group (P < 0.001).

CONCLUSION

Improvements in HbA1c were associated with the provision of health education and medication adjustments.

Prevalence and impact of polypharmacy in older patients with type 2 diabetes

BACKGROUND

Polypharmacy is a prevalent condition in older adults, especially those with multiple chronic diseases, and has been largely associated with adverse outcomes, including disability, hospitalizations, and death.

AIMS

This systematic review focused on diabetes and aimed to investigate the prevalence and impact of polypharmacy in older adults affected by such disease.

METHODS

Observational (either cross-sectional or longitudinal) or experimental studies investigating the frequency and impact of polypharmacy in older adults with diabetes were identified from scientific databases and grey literature until August 2021. The prevalence and the 95% Confidence Interval (95% CI) of polypharmacy in older people with diabetes were summarized by a random-effects meta-analysis.

RESULTS

From a total of 1465 records, 9 were selected for the qualitative synthesis, and 8 for the quantitative synthesis. Most studies defined polypharmacy using a cut-off for the minimum number of medications ranging from 4 to 6 drugs/day. The pooled prevalence of polypharmacy in older people with diabetes was 64% (95% CI 45-80%). Considering studies that used the same definition of polypharmacy (i.e. ≥ 5 drugs/day), the pooled prevalence was 50% (95% CI 37-63%). The between-studies heterogeneity was high. Across the selected studies, polypharmacy seemed to negatively influence both diabetes-specific (poor glycemic control and risk of hypoglycemia) and health-related (risk of incident falls, syncope, hospitalization, and death) outcomes.

CONCLUSION

This systematic review confirms the high prevalence of polypharmacy in older people with diabetes and its strong impact on several health-related outcomes, including mortality. These results strengthen the need to improve care strategies for management of these patients.