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