Key result
Intensification with PCSK9i in combination with other lipid-lowering therapies in acute myocardial infarction patients reduced median LDL-C to 0.9 mmol/l, outperforming statins or ezetimibe alone.
Why the study?
A high proportion of Canadian AMI patients do not achieve 2021 Canadian Cardiovascular Society guideline LDL-C thresholds, increasing ASCVD risk.
Does treatment intensification with PCSK9i improve LDL-C threshold achievement in patients post-AMI compared to statins or ezetimibe alone?
Cohort (n=15,283)
Does treatment intensification with PCSK9i improve LDL-C threshold achievement in patients post-AMI compared to statins or ezetimibe alone?
Absolute Event Rate: 0.9% vs 1.4%
Intensification with PCSK9i in post-AMI patients significantly increases the proportion of patients achieving recommended LDL-C thresholds compared to statins or ezetimibe alone.
Persistent LDL-C nonachievement post-AMI signals need for optimized LLT; leaves open which regimens best close the gap in Canadian practice.
INTRODUCTION: A high proportion of Canadian patients with acute myocardial infarction (AMI) do not achieve the threshold low-density lipoprotein cholesterol (LDL-C) levels recommended by the Canadian Cardiovascular Society in 2021. This increases the risk of subsequent atherosclerotic cardiovascular disease (ASCVD) events. Here, we assess LDL-C levels and threshold achievement among patients by lipid-lowering therapies (LLT) received post-AMI. METHODS: A retrospective cohort study of patients identified with AMI between 2015 and 2019 was conducted using administrative health databases in Alberta, Canada. Patients were grouped by their highest-intensity LLT post-AMI (proprotein convertase subtilisin/kexin type 9 inhibitors (PCSK9i) + another LLT; PCSK9i alone; ezetimibe + statin; statins (high, moderate, low intensity); or ezetimibe alone), and available LDL-C levels were examined in the year before and after LLT dispense date. RESULTS: The cohort included 15,283 patients. In patients on PCSK9i + LLT, the median [95% confidence interval (CI)] LDL-C levels decreased from 2.7 (2.3-3.4) before to 0.9 (0.5-1.2) mmol/l after treatment, the largest decrease among treatment groups. In the ezetimibe + statin and high-intensity statin groups, median (95% CI) values after treatment were 1.5 (1.5-1.6) and 1.4 (1.4-1.4) mmol/l, respectively. The proportion of patients below the 1.8 mmol/l threshold increased by 77.7% in the PSCK9i + LLT group after treatment, compared to 45.4 and 32.4% in the ezetimibe + statin and high-intensity statin groups, respectively. CONCLUSIONS: Intensification with PCSK9i in AMI patients results in a greater proportion of patients achieving below the recommended LDL-C threshold versus statins and or ezetimibe alone. Increased focus on achieving below the LDL-C thresholds with additional LLT as required may benefit patient cardiovascular outcomes.
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Mackinnon et al. (2023) conducted a cohort in Acute Myocardial Infarction (n=15,283). PCSK9i in combination with other lipid-lowering therapies vs. Statins and/or ezetimibe alone was evaluated on Median LDL-C level (mmol/l) after treatment (95% CI 0.5-1.2). Intensification with PCSK9i in combination with other lipid-lowering therapies in acute myocardial infarction patients reduced median LDL-C to 0.9 mmol/l, outperforming statins or ezetimibe alone.
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