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Published in: Orphanet Journal of Rare Diseases 1/2016

Open Access 01-12-2016 | Research

Lipid profile status and other related factors in patients with Hyperphenylalaninaemia

Authors: María L. Couce, Isidro Vitoria, Luís Aldámiz-Echevarría, Ana Fernández-Marmiesse, Iria Roca, Marta Llarena, Paula Sánchez-Pintos, Rosaura Leis, Alvaro Hermida

Published in: Orphanet Journal of Rare Diseases | Issue 1/2016

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Abstract

Background

The mainstay of treating patients with phenylketonuria (PKU) is based on a Phe-restricted diet, restrictive in natural protein combined with Phe-free L-amino acid supplements and low protein foods. This PKU diet seems to reduce atherogenesis and confer protection against cardiovascular diseases but the results from the few published studies have been inconclusive. The aim of our study was to evaluate the relationship between the lipid profile and several treatment-related risk factors in patients with hyperphenylalaninaemia (HPA) in order to optimize their monitoring.

Methods

We conducted a cross-sectional multicentre study. A total of 141 patients with HPA were classified according to age, phenotype, type of treatment and dietary adherence. Annual median blood phenylalanine (Phe) levels, Phe tolerance, anthropometric measurements, blood pressure (BP) and biochemical parameters [(triglycerides, total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low density lipoprotein-cholesterol (LDL-C), apolipoprotein A (ApoA), apolipoprotein B (ApoB), vitamin B12, total homocysteine (tHcy), Methionine (Met), high sensitivity C-Reactive Protein (hsCRP)] were collected for each patient.

Results

Plasma TC levels were lower in patients with PKU than in the mild-HPA group (150 ± 31 vs. 164 ± 22 mg/dL), and there was a weak inverse correlation between plasma TC and Phe levels. HDL-C, LDL-C, ApoA and ApoB levels were lower in the PKU group than in mild-HPA. Patients with PKU had higher systolic BP than the mild-HPA group and there was found a quadratic correlation between median Phe levels and systolic BP (p = 6.42e-5) and a linear correlation between median Phe levels and diastolic BP (p = 5.65e-4). In overweight or obese PKU patients (24.11 %), biochemical parameters such as TC, triglycerides, LDL-C, tHcy, hsCRP and BP were higher. By contrast, HDL-C was lower in these patients.

Conclusion

Our data show a direct correlation between lipid profile parameters and good adherence to the diet in PKU patients. However, lipid profile in overweight or obese patients displayed an atherogenic profile, in addition to higher hsCRP concentrations and BP. Our study contributes to a better understanding of the relationship between phenotype and treatment in patients with HPA, which could be useful in improving follow-up strategies and clinical outcome.

Trial registration

Research Ethics Committee of Santiago-Lugo 2015/393. Registered 22 September 2015, retrospectively registered.
Appendix
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Metadata
Title
Lipid profile status and other related factors in patients with Hyperphenylalaninaemia
Authors
María L. Couce
Isidro Vitoria
Luís Aldámiz-Echevarría
Ana Fernández-Marmiesse
Iria Roca
Marta Llarena
Paula Sánchez-Pintos
Rosaura Leis
Alvaro Hermida
Publication date
01-12-2016
Publisher
BioMed Central
Published in
Orphanet Journal of Rare Diseases / Issue 1/2016
Electronic ISSN: 1750-1172
DOI
https://doi.org/10.1186/s13023-016-0508-x

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