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Published on: November 10, 2017
Classification, prevalence and cardiovascular risk of different types of hypercholesterolemia
Fernando Civeira1, Estíbaliz Jarauta1, Victoria Marco-Benedí1
1Unidad de Lípidos, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain; Centro de Investigación Biomédica en Red de Enfermedades Cardiovasculares (CIBERCV), Instituto de Salud Carlos III, Madrid, Spain; Departamento de Medicina, Psiquiatría y Dermatología, Universidad de Zaragoza, Zaragoza, Spain.
Insights
Genetic hypercholesterolemia, particularly with elevated lipoprotein(a), leads to a worse atherosclerotic cardiovascular disease (ASCVD) prognosis. Treatment effectiveness for low-density lipoprotein cholesterol may be reduced in hyperlipoproteinemia(a).
Area of Science:
- Cardiology
- Genetics
- Metabolic Disorders
Background:
- The clinical characteristics and atherosclerotic cardiovascular disease (ASCVD) risk associated with different types of hypercholesterolemia are not fully understood.
- Determining the cause of hypercholesterolemia is crucial for assessing ASCVD prognosis.
Purpose of the Study:
- To investigate the frequency, clinical features, and ASCVD risk across various hypercholesterolemia types.
- To ascertain if the underlying cause of hypercholesterolemia influences ASCVD outcomes.
Main Methods:
- Analysis of 3474 probands with primary hypercholesterolemia, followed for ASCVD.
- Classification of hypercholesterolemia using genetic analysis (familial hypercholesterolemia genes), polygenic risk scores, and lipid levels (including lipoprotein(a)).
Main Results:
- Heterozygous familial hypercholesterolemia (FH) showed higher baseline low-density lipoprotein cholesterol; hyperlipoproteinemia(a) had a higher ASCVD prevalence.
- Participants with hyperlipoproteinemia(a) had a significantly lower survival rate compared to other groups.
- ASCVD events were independently associated with age, male sex, baseline ASCVD/diabetes/hypertension, smoking, lipoprotein(a), and high-density lipoprotein cholesterol.
Conclusions:
- Genetic hypercholesterolemia confers a poorer ASCVD prognosis than non-genetic forms.
- Elevated lipoprotein(a) in genetic hypercholesterolemia is linked to the worst ASCVD prognosis.
- Standard lipid-lowering therapies may be less effective for hyperlipoproteinemia(a)-associated hypercholesterolemia.
Introduction And Objectives:
The frequency, clinical characteristics and risk of atherosclerotic cardiovascular disease (ASCVD) of the different types of hypercholesterolemia are not well established. The primary and secondary objectives of this study were to determine the cause of hypercholesterolemia and whether the cause confers a different ASCVD prognosis.
Methods:
The analysis included 3474 probands with primary hypercholesterolemia, of whom 3283 (94.8%) were followed up for 9.33± 5.8 years for ASCVD. Genetic analysis of familial hypercholesterolemia (FH) genes, polygenic risk score for hypercholesterolemia, and lipid concentrations, including lipoprotein(a), were used to classify hypercholesterolemia.
Results:
The diagnoses were heterozygous FH, n=400 (11.5%); hyperlipoproteinemia(a), n=181 (5.2%); polygenic hypercholesterolemia, n=434 (12.5%); hyperlipoproteinemia(a) plus polygenic hypercholesterolemia, n=128 (3.7%); multifactorial, n=1562 (45.0%); and idiopathic, n=769 (22.1%). At baseline, low-density lipoprotein cholesterol levels were higher in heterozygous FH, and the prevalence of ASCVD was higher in hyperlipoproteinemia(a). Other clinical and biochemical characteristics did not differ among hypercholesterolemia subgroups. The survival rate was lower in participants with hyperlipoproteinemia(a) than in the other hypercholesterolemia groups (P=.001). Variables independently associated with ASCVD events during follow-up were age, male sex, the presence of ASCVD, diabetes or hypertension at baseline, current smoking, lipoprotein(a) concentration, and high-density lipoprotein cholesterol concentration, the latter being inversely associated with ASCVD events. Total mortality was independent of the type of hypercholesterolemia.
Conclusions:
Genetic hypercholesterolemia has a worse prognosis for ASCVD than nongenetic hypercholesterolemia. Among individuals with genetic hypercholesterolemia, those with elevated lipoprotein(a) have the worst prognosis. Conventional lipid-lowering treatment for low-density lipoprotein cholesterol appears to be less effective in hypercholesterolemia due to hyperlipoproteinemia(a) than in other forms of hypercholesterolemia.
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