Erna Van Hoeyveld
Katholieke Universiteit Leuven
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Featured researches published by Erna Van Hoeyveld.
The Journal of Allergy and Clinical Immunology | 1985
Erna Van Hoeyveld; Erik Stevens
The effect of epsilon-aminocaproic acid (EACA) on the degradation of an aqueous Lolium perenne extract was studied by intracutaneous tests and by RAST inhibition. Extracts for skin testing stored at 4 degrees C for 12 months and at 37 degrees C for 6 weeks were significantly protected from degradation by addition of 0.1 mol/L of EACA before storage. Extracts were stored for RAST inhibition at 4 degrees C for 6 months and at 37 degrees C for 7 days. Shelf life was twofold to threefold increased when 0.1 mol/L of EACA was added to the dilution medium. EACA also protected the extracts from the effect of freezing and thawing. Comparison with the effect of human serum albumin indicated a rather short activity of human serum albumin, whereas the effect of EACA lasted longer. It is suggested that EACA can be used to increase the stability of aqueous allergen extracts for skin testing and for hyposensitization therapy.
Clinical Chemistry and Laboratory Medicine | 2018
Philippe Willems; Ellen De Langhe; Jolien Claessens; Rene Westhovens; Erna Van Hoeyveld; Koen Poesen; Steven Vanderschueren; Daniel Engelbert Blockmans; Xavier Bossuyt
Abstract Background: Antinuclear antibodies (ANAs) are useful for the diagnosis of ANA-associated systemic rheumatic disease (AASRD). The objective of this study was the evaluation of an immunoassay that detects antibodies to a mixture of 17 antigens as an alternative to indirect immunofluorescence (IIF). Methods: Nine thousand eight hundred and fifty-six consecutive patients tested for ANAs were tested by IIF and EliA connective tissue disease screen (Thermo-Fisher). Medical records were reviewed for 2475 patients, including all patients that tested positive/equivocal by either test and a selection of 500 patients that tested negative. Results: Concordance between IIF and EliA was 83.1%. AASRD was found in 12.8% of IIF-positive patients, 30.2% of EliA-positive patients and 0.4%, 46.6%, 5.8% and 3.0% of patients that tested, respectively, double negative, double positive, single positive for EliA and single positive for IIF. The association with AASRD increased with increasing antibody level. IIF and EliA were positive in, respectively, 90.4% and 69.9% of systemic lupus erythematosus (n=83), 100% and 84.1% of systemic sclerosis (n=63), 86.7% and 93.3% of Sjögren’s syndrome (n=45), 88.2% and 52.9% of polymyositis/dermatomyositis (n=17), and in all cases of mixed connective tissue disease (n=8). The specificity was projected to be 94%–96% for EliA and 86% for IIF. When all AASRDs were taken together, the areas under the curve of receiver operator curves were similar between IIF and EliA. Conclusions: The positive predictive value for AASRD was higher for EliA than for IIF, but, depending on the disease, EliA might fail to detect antibodies that are detected by IIF. Combining immunoassay with IIF adds value.
The Journal of Allergy and Clinical Immunology | 1989
Erna Van Hoeyveld; Monique Lejoly; Michel J.F. Walravens; Erik Stevens
The effect of epsilon-aminocaproic acid (EACA) on the degradation of aqueous pollen extracts was studied by isoelectric focusing, sodium dodecyl sulfate-polyacrylamide gel electrophoresis, and immunoblotting. The extracts were stored at 4 degrees C for 7 days and at 37 degrees C for 1, 4, and 7 days. Addition of 0.1 mol/L of EACA before storage partly protected the extract from degradation. The protective effect of EACA could be demonstrated most clearly by immunoblotting, suggesting that more epitopes were preserved in an antigenic configuration. The stabilizing effect increased with higher EACA concentrations.
International Journal of Chronic Obstructive Pulmonary Disease | 2017
Stephanie Everaerts; Katrien Lagrou; Adriana Dubbeldam; Natalie Lorent; Kristina Vermeersch; Erna Van Hoeyveld; Xavier Bossuyt; Lieven Dupont; Bart Vanaudenaerde; Wim Janssens
Background Bronchiectasis–chronic obstructive pulmonary disease (COPD) overlap presents a possible clinical phenotype of COPD, but it is unclear why it develops in a subset of patients. We hypothesized that sensitization to Aspergillus fumigatus (A fum) is associated with bronchiectasis in COPD and occurs more frequently in vitamin D-deficient patients. Methods This observational study investigated sensitization to A fum in an outpatient clinical cohort of 300 COPD patients and 50 (ex-) smoking controls. Total IgE, A fum-specific IgE against the crude extract and against the recombinant antigens and A fum IgG were measured using ImmunoCAP fluoroenzyme immunoassay. Vitamin D was measured by radioimmunoassay, and computed tomography images of the lungs were scored using the modified Reiff score. Results Sensitization to A fum occurred in 18% of COPD patients compared to 4% of controls (P=0.0110). In all, 31 COPD patients (10%) were sensitized to the crude extract and 24 patients (8%) had only IgE against recombinant antigens. A fum IgG levels were significantly higher in the COPD group (P=0.0473). Within COPD, A fum-sensitized patients were more often male (P=0.0293) and more often had bronchiectasis (P=0.0297). Pseudomonas aeruginosa and Serratia marcescens were more prevalent in historical sputum samples of A fum-sensitized COPD patients compared to A fum-non-sensitized COPD patients (P=0.0436). Vitamin D levels were comparable (P=0.2057). Multivariate analysis demonstrated that sensitization to recombinant f1 or f3 had a 2.8-fold increased risk for bronchiectasis (P=0.0030). Conclusion These results highlight a potential role for sensitization to A fum in COPD-related bronchiectasis.
Journal of The American Academy of Dermatology | 1993
Marie-Anne Morren; Veronique Janssens; A. Dooms-Goossens; Erna Van Hoeyveld; Ann Cornelis; Annie Heremans
Diagnostic Microbiology and Infectious Disease | 2018
Iain Page; Caroline G. Baxter; Christophe Hennequin; Malcolm D. Richardson; Erna Van Hoeyveld; Albert W. van Toorenenbergen; David W. Denning
Iranian Journal of Allergy Asthma and Immunology | 2018
Mohammad Shahrooei; Abbas Fayezi; Raheleh Shokouhi Shoormasti; Faramarz Zakavi; Leila Golpasand Hagh; Johan Van Eldere; Xavier Bossuyt; Erna Van Hoeyveld
European Respiratory Journal | 2017
Stephanie Everaerts; Katrien Lagrou; Adriana Dubbeldam; Natalie Lorent; Kristina Vermeersch; Xavier Bossuyt; Erna Van Hoeyveld; Lieven Dupont; Bart Vanaudenaerde; Wim Janssens
European Respiratory Journal | 2015
Stephanie Everaerts; Erna Van Hoeyveld; Kristina Vermeersch; Lieven Dupont; Bart Vanaudenaerde; Xavier Bossuyt; Katrien Lagrou; Wim Janssens
Archive | 2004
Erna Van Hoeyveld; Frans Houtmeyers; Caroline Massonet; Leen Moens; Marc Van Ranst; Norbert Blanckaert; Xavier Bossuyt