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Lipoprotein(a) and Calcific Aortic Valve Stenosis Progression: A Systematic Review and Meta-Analysis
Benoit J Arsenault1,2, Krithika Loganath3, Arnaud Girard1
1Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie de Québec, Université Laval, Québec, Canada.
Insights
Higher plasma lipoprotein(a) levels accelerate aortic stenosis progression. This finding suggests that targeting lipoprotein(a) may offer a new treatment strategy for aortic stenosis patients.
Area of Science:
- Cardiovascular Medicine
- Clinical Research
- Biomarkers
Background:
- Aortic stenosis (AS) lacks pharmacological treatments to slow hemodynamic progression.
- Plasma lipoprotein(a) [Lp(a)] predicts AS incidence, but its role in AS progression is debated.
Purpose of the Study:
- To investigate the association between plasma Lp(a) concentrations and the rate of hemodynamic progression in patients with AS.
Main Methods:
- Analysis of data from 710 patients with AS across 5 longitudinal studies in Canada and the UK (2001-2023).
- Assessment of hemodynamic progression via echocardiography, measuring annualized changes in peak aortic jet velocity, mean transvalvular gradient, and aortic valve area.
- Stratification of patients into Lp(a) concentration tertiles for comparative analysis.
Main Results:
- Patients in the highest Lp(a) tertile showed significantly faster progression in peak aortic jet velocity (41% faster) and mean transvalvular gradient (57% faster) compared to the lowest tertile.
- No significant difference in aortic valve area progression was observed between Lp(a) groups.
- Results remained consistent when Lp(a) was analyzed as a continuous variable.
Conclusions:
- Elevated plasma Lp(a) concentrations are associated with accelerated hemodynamic progression of aortic stenosis.
- Targeting Lp(a) may represent a potential therapeutic avenue for preventing or slowing AS progression, warranting further investigation.
Importance:
There are currently no pharmacological treatments available to slow hemodynamic progression of aortic stenosis. Plasma lipoprotein(a) concentrations predict incident aortic stenosis but its association with hemodynamic progression is controversial.
Objective:
To determine the association between plasma lipoprotein(a) concentrations and hemodynamic progression in patients with aortic stenosis.
Design, Settings And Participants:
The study included patients with aortic stenosis from 5 longitudinal clinical studies conducted from March 2001 to March 2023 in Canada and the UK. Of 757 total patients, data on plasma lipoprotein(a) concentrations and rates of hemodynamic progression assessed by echocardiography were available for 710, who were included in this analysis. Data were analyzed from March 2023 to April 2024.
Exposure:
Cohort-specific plasma lipoprotein(a) concentration tertiles.
Main Outcomes And Measures:
Hemodynamic aortic stenosis progression on echocardiography as assessed by annualized change in peak aortic jet velocity, mean transvalvular gradient, and aortic valve area.
Results:
Among the included patients, 497 (70%) were male and 213 (30%) were female. The mean (SD) age was 65.2 (13.1) years. Patients in the top lipoprotein(a) tertile demonstrated 41% (estimate, 1.41; 95% CI, 1.13-1.75) faster progression of peak aortic jet velocity and 57% (estimate, 1.57; 95% CI, 1.18-2.10) faster progression of mean transvalvular gradient than patients in the bottom tertile. There was no evidence of heterogeneity across the individual cohorts. Progression of aortic valve area was comparable between groups (estimate, 1.23; 95% CI, 0.71-2.12). Similar results were observed when plasma lipoprotein(a) concentrations were treated as a continuous variable.
Conclusions And Relevance:
In this study, higher plasma lipoprotein(a) concentrations were associated with faster rates of hemodynamic progression in patients with aortic stenosis. Lowering plasma lipoprotein(a) concentrations warrants further investigation in the prevention and treatment of aortic stenosis.
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