Increased Aortic Valve Calcification in Familial Hypercholesterolemia: Prevalence, Extent, and Associated Risk Factors.

Abstract

BACKGROUND:

Familial hypercholesterolemia is typically caused by LDL receptor (LDLR) mutations that result in elevated levels of LDL cholesterol (LDL-C). In homozygous FH, the prevalence of aortic valve calcification (AoVC) reaches 100% and is often symptomatic.

OBJECTIVES:

The objective of this study was to investigate the prevalence, extent, and risk-modifiers of AoVC in heterozygous FH (he-FH) that are presently unknown.

METHODS:

Asymptomatic patients with he-FH and 131 non-familial hypercholesterolemia controls underwent CT computed tomography calcium scoring. AoVC was defined as the presence of calcium at the aortic valve leaflets. The extent of AoVC was expressed in Agatston units, as the AoVC-score. We compared the prevalence and extent of AoVC between cases and controls. In addition, we investigated risk modifiers of AoVC, including the presence of LDLR mutations without residual function (LDLR-negative mutations), maximum untreated LDL-cholesterol (maxLDL), LDL-C, blood pressure, and coronary artery calcification (CAC).

RESULTS:

We included 145 asymptomatic patients with he-FH (93 men; mean age 52 ± 8 years) and 131 non-familial hypercholesterolemia controls. The prevalence (%) and AoVC-score (median, IQR) were higher in he-FH patients than in controls: 41%, 51 (9-117); and 21%, 21 (3-49) (p < 0.001 and p = 0.007). Age, untreated maxLDL, CAC, and diastolic blood pressure were independently associated with AoVC. LDLR-negative mutational he-FH was the strongest predictor of the AoVC-score (OR: 4.81; 95% CI: 2.22 to 10.40; p = <0.001).

CONCLUSIONS:

Compared to controls, he-FH is associated with a high prevalence and a large extent of subclinical AoVC, especially in patients with LDLR-negative mutations, highlighting the critical role of LDL-C metabolism in AoVC etiology.

• Authors: Gert-Jan R Ten Kate, Sven Bos, Admir Dedic, Lisan A Neefjes, Akira Kurata, Janneke G Langendonk, Anho Liem, Adriaan Moelker, Gabriel P Krestin, Pim J de Feyter, Jeanine E Roeters van Lennep, Koen Nieman, Eric J Sijbrands
• Journal: Journal of the American College of Cardiology (J Am Coll Cardiol) Vol. 66 Issue 24 Pg. 2687-2695 (Dec 22 2015) ISSN: 1558-3597 [Electronic] United States
• PMID: 26700830 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2015 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.

Chemical References

• Lipoproteins
• DNA
• Calcium

Topics

• Aortic Valve (diagnostic imaging, metabolism, pathology)
• Aortic Valve Stenosis (diagnosis, epidemiology, etiology)
• Calcinosis (diagnosis, epidemiology, etiology)
• Calcium (metabolism)
• DNA (genetics)
• Echocardiography
• Female
• Humans
• Hyperlipoproteinemia Type II (blood, complications, genetics)
• Lipoproteins (blood, genetics)
• Male
• Middle Aged
• Mutation
• Netherlands (epidemiology)
• Prevalence
• Retrospective Studies
• Risk Factors
• Tomography, X-Ray Computed