- Meeting abstracts
- Open Access
Abstracts from the Food Allergy and Anaphylaxis Meeting 2016
Clinical and Translational Allergy volume 7, Article number: 10 (2017)
ORAL ABSTRACT SESSION 1: Food allergens • Anaphylaxis
OP01 Fatal anaphylaxis is decreasing in France: analysis of national data, 1979–2011
Guillaume Pouessel1,2,3, Claire Claverie4, Julien Labreuche5, Jean-Marie Renaudin3,6, Aimée Dorkenoo4, Mireille Eb7, Anne Moneret-Vautrin6, Antoine Deschildre2,3, Stephane Leteurtre4
1Department of Pediatrics, Children’s Hospital, Roubaix, France; 2Division of Pulmonology and Allergology, Department of Pediatrics, Faculty of Medicine and Children’s Hospital, Lille, France; 3Allergy Vigilance Network, Vandoeuvre les Nancy, France; 4Université Lille 2, CHU Lille, EA 2694 - Santé Publique: épidémiologie et qualité des soins, Lille, France; 5Biostatistic Unit, Maison Régionale de la Recherche Clinique, CHRU Lille, Lille, France; 6Department of Allergology, Emile Durkheim Hospital, Epinal, France; 7Centre d’Epidémiologie sur les Causes Médicales de Décès INSERM, CHU de Bicêtre, Le Kremlin-Bicêtre, France
Correspondence: Guillaume Pouessel - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP01
Introduction: Incidence of anaphylaxis is increasing. Data regarding anaphylaxis mortality are limited, but conflicting. Our objective was to document anaphylaxis mortality rate (deaths per million population), time trends and specificities according to triggers (iatrogenic, venom, food, unknown), age groups, sex and geographical regions (North and South) in France, between 1979 and 2011.
Methods: Data were obtained (1) from database of the National Mortality Center (CEPIDC) to collect cases in which anaphylaxis was included as a cause of death, sex, age, and geographic region of death, (2) from the database of the National Institute for Economical and Statistical studies (INSEE) to define the referent populations. We used a multivariable log-linear Poisson regression model to assess the impact of time period, age, sex and geographic region on anaphylaxis deaths.
Results: During the period study, 1603 deaths were collected: 1564 in adults and 39 in children (age <18 year). The overall prevalence of anaphylaxis fatalities was 0.84 per million population (95% IC 0.80–0.88), ranging from 0.08 per million (95% IC 0.05–0.10) in pediatric population to 1.12 per million (95% CI 1.06 to 1.17) in adult population. Annual percentage change for case fatality rate was −2.0% (95% CI −2.5 to −1.5; p < 10−4) indicating a decrease in case fatality rate during the study period. Anaphylaxis fatality rate was higher in men (1.08 per million [95% IC 1.00 1.16] than women (0.86 per million [95% IC 0.80–0.92]) (p < 10−4). Triggers of anaphylaxis fatalities were iatrogenic (63%), mostly drugs, venom (14%) and food (0.6%). Unspecified anaphylaxis was frequent (23%). The highest rate was in persons aged >70 years (3.50 per million population per year [95% IC 3.25–3.76]) and the lowest in the pediatric population (p < 10−4). Only venom-induced mortality rate was higher in South of France (0.16 per million [95% IC 0.13–0.19]) compared with the North (0.11 per million [95% IC 0.09–0.13]) (p = 0.004). Only 8 food-induced fatalities were recorded (age <35 years in 7 cases).
Conclusion: Overall anaphylaxis mortality rate is decreasing over the three last decades in France. We confirm that iatrogenic causes are the most frequent causes. Older age and male sex are risk factors of fatal anaphylaxis of any cause except for food-induced anaphylaxis.
OP02 Diagnostic workup after severe anaphylaxis
Linus Grabenhenrich1, Margitta Worm1, Sabine Dölle1, Kathrin Scherer2, Isidor Hutteger3
1Charité - Universitätsmedizin Berlin, Berlin, Germany; 2University Hospital Basel, Basel, Switzerland; 3Universitätsklinikum Salzburg, Salzburg, Austria
Correspondence: Linus Grabenhenrich - firstname.lastname@example.org
Clinical and Translational Allergy 2017, 7(Suppl 1):OP02
Introduction: After a severe anaphylactic reaction, a diagnostic workup is recommended to confirm or rule out the elicitor(s) in question. The type of diagnostic chosen is usually based on the elicitor and severity of the reaction and might follow local experiences. We aimed to describe elicitor-specific diagnostic habits in the workup of severe anaphylaxis, comparing European countries.
Methods: The Network for Online Registration of Anaphylaxis (NORA) collected details about elicitors, symptoms and severity, treatment and the diagnostic workup of patients who experienced at least one episode of severe anaphylaxis, as documented within medical records of participating tertiary referral centres.
Results: Between June 2011 and April 2016, the registry collected data for 6465 cases of severe anaphylaxis, 74% of which reported to know the elicitor, with a remaining 20% having only a suspicion and 6% cases of idiopathic anaphylaxis. The allergen was known and confirmed by a diagnostic test in 4410 (92% of known elicitors). Of these, 68% had a reaction to this allergen for the first time, and 32% reported at least one earlier reaction to the same allergen. In first-time reactors (n = 3001) 7% reported that the allergen was confirming by a diagnostic test already before this reaction, for food 14%, insects 3%, drugs 2%, and 80% for SIT-induced anaphylaxis. Of cases with recurrent anaphylaxis (n = 1409), 30% had a test confirming the allergen before the reported reaction, for food 44%, insects 16%, drugs 18%, and 91% for SIT-induced anaphylaxis. Of all diagnostically confirmed cases of food-induced anaphylaxis (n = 1555), 78% were assessed by a skin test (SPT, positive in 93%), 90% by specific IgE (sIgE, 94% positive), 27% tryptase (7% positive), and 13% underwent an oral food challenge (positive in 88%). Patients with anaphylaxis caused by drugs had the following tests (positives of these): SPT 88% (49%), sIgE 31% (46%), tryptase 48% (11%), and provocation 19% (68%). For reactions against insect venom: SPT 79% (84%), sIgE 98% (97%), and tryptase 93 (8%). Irrespective of the elicitor, SPTs were performed more often in Austria, Ireland and Greece (92, 96, and 99%, respectively), and less often in Italy (64%). Tryptase was almost never measured in Ireland, Greece and France, whereas determination of specific IgE was carried out similarly between European countries.
Conclusion: The choice of diagnostic measure depended on the elicitor and varied by country. Especially the assessment of tryptase is handled very differently between allergens in question and countries. These differences may indicate aspects of the diagnostic workup with a certain degree of ambiguity, which might benefit from further harmonization.
OP03 Primary sensitisation versus co-sensitisation to hydrolysed wheat protein
Morten Christensen, Carsten Bindslev-Jensen, Charlotte Mortz
Department of Dermatology and Allergy Centre, Odense Research Center for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark
Correspondence: Morten J. Christensen - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP03
Introduction: Wheat protein is responsible for various phenotypes of allergic diseases. More recently an increased number of immediate type 1 allergic reactions to hydrolyzed wheat proteins (HWP) have been reported.
The aim of this study was to characterize the clinical profile and evaluate patients with a case-history of anaphylaxis related to ingestion of a product containing HWP. Furthermore, to describe patients with other types of wheat allergy co-sensitized for HWP.
Methods: From May 2010 to August 2015 we investigated 56 patients (31 female, 25 male, mean age 39.0 years [1.5–77.2]) sensitized to commercialized HWP, either by specific immunoglobulin E (sIgE) (ThermoFischer, Uppsala, Sweden) and/or skin prick test (SPT). Based upon case-history patients were divided into 3 groups: (1) allergic reaction to ingestion of a HWP containing product (n = 9) (2) ingestion of a wheat product; WIA (n = 19), (3) ingestion of a wheat product in combination with exercise; WDEIA (n = 28). All patients were orally challenged with the incriminated food.
Results: The total positive rate of sIgE to HWP was 47/56 (83.9%), SPT 35/42 (83.3%) and BHR 22/42 (52.3%). Fourteen patients were triple positive to commercialized HWP of whom 7/9 patients in the HWP group. In total 9 (16%) patients were identified with a case-history of anaphylaxis related to a HWP containing product. Seven of 9 had a case-history to the same hydrolyzed wheat product (AMO Letbagt®). The average serum level of HWP-sIgE and the SPT were higher in patients with a case-history of HWP, respectively (median 5.3 kU/L ±6.8) (p < 0.05) and (median 6.0 mm ±4.1) (p < 0.05) compared to the WIA and WDEIA groups. A complete negative pattern was determined with specific wheat proteins normally associated with other phenotypes of wheat allergy, omega-5 gliadin (f416), gliadin (f98), High Molecular Weight (Tri a 26) and α-amylase trypsin inhibitor (Tri a 30). Basophil histamine release (BHR) for HWP was extremely positive in 8/9 HWP patients with activity retained to dilutions up to 10−12. The most striking finding was the ultrahigh sensitivity of BHR in diagnosing allergy to HWP. It is, however, interesting, that the HWP patient tolerates ingestion of unmodified wheat.
Conclusion: Reactivity to HWP seems to be confined to patients specifically sensitized to this heterogeneous group of products without concomitant allergy to normal wheat. Irrelevant co-sensitization is also seen in classical wheat allergy.
OP04 Actual adrenalin treatment in a specialised clinical setting, compared to administration as recommended by a built-in algorithm in a severity scoring instrument in food allergy
Esben Eller, Henrik Fomsgaard Kjaer, Charlotte Mortz, Carsten Bindslev-Jensen
Odense University Hospital, Odense, Denmark
Correspondence: Esben Eller - firstname.lastname@example.org
Clinical and Translational Allergy 2017, 7(Suppl 1):OP04
Introduction: One of the most used severity scoring instruments, the Sampson 1–5, includes a built-in algorithm indicating symptoms which necessitate adrenalin administration. These include grade 5 anaphylactic symptoms, but also grade 3 and 4 such as laryngeal “puritus, tightness, or dysphagia” and lower respiratory symptoms such as “wheezing, dyspnea or cyanosis”. Our aim was to compare the recommended adrenalin administration with the actual administration in our clinic in relation to the underlying eliciting symptom.
Methods: Data from 2382 positive food challenges (mean age 11.6 years [range: 0.5–74.1y]) performed between Jan. 2000 and Dec. 2015 at the Allergy Centre, Odense, Denmark were included, and severity of reactions was assessed using the Sampson 1–5 severity instrument. All patients were evaluated by experienced specialists during challenge. Actual medications administered during the challenges, i.e. adrenalin, β2-agonist, corticosteroid, or antihistamine were compared with recommended adrenalin treatment according to the algorithm in Sampson 1–5.
Results: Out of 346 challenges scored as grade 4 anaphylaxis, 296 were terminated due to respiratory symptoms requiring adrenalin according to Sampson 1–5, i.e. “barky cough, hoarseness, difficulty swallowing” (laryngeal, n = 79), “wheezing, dyspnea, cyanosis” (lower resp. n = 181) or both (n = 36). Nine of the 115 patients with laryngeal symptoms were treated with adrenalin, all due to inspiratory stridor. No patients with lower respiratory symptoms received adrenalin, but the majority were treated with β2 agonists (188/217), whereas in 30 challenges, symptoms disappeared without treatment or only antihistamine for concomitant urticaria were used. Patients solely with laryngeal symptoms received β2-agonists in 16 challenges, but the majority of them (54/79) received no treatment or only antihistamine. The 36 patients with both laryngeal and lower respiratory symptoms were treated in same manner as patients with only lower respiratory symptoms, i.e. β2 agonist for their bronchial wheeze or asthma. Grade 5 anaphylaxis was seen in 11 challenges, 1 caused by non-adrenalin recommended “loss of bowel control”. In the remaining 10 cases, 7 patients were treated with adrenalin, either due to “hypotension < 90 mm Hg” (n = 3) or “unconsciousness” (n = 4). Three children fainted, but regained consciousness without administration of adrenalin. Grade 5 anaphylaxis should almost always be treated with adrenalin, whereas adrenalin only was administrated to inspiratory stridor and not to bronchial expiratory wheeze or asthma in grade 4 anaphylaxis. Respiratory signs were instead medicated according to symptoms, i.e. with β2-agonist to relieve bronchoconstriction. All patients were evaluated by experienced specialists, and therefore this practice should be addressed with care in less experienced settings.
Conclusion: Inspiratory stridor was the main cause of adrenalin treatment in grade 4 anaphylaxis, whereas the majority of lower respiratory symptoms were treated with inhalant β2 agonists, thereby overcoming the need for adrenalin. This needs to be considered in future treatment recommendations.
OP05 Do patients know how to use adrenaline auto-injectors?
Leonor Carneiro-Leão†, Jenny Badas†, Luís Amaral, Alice Coimbra
Serviço de Imunoalergologia, Centro Hospitalar de São João, Porto, Portugal
†The first two authors have equal contribution.
Correspondence: Leonor Carneiro-Leão - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP05
Introduction: Adrenaline auto-injectors (AAI) are the first line treatment for anaphylaxis in community settings. Two are currently available in Portugal (Anapen® and Epipen®).
Our aim was to evaluate patient’s ability to properly use AAIs; impact of device switching and patients’ preferences.
Methods: Patients who had been prescribed an AAI in our department were invited to demonstrate correct technique of AAI by simulating adrenaline administration using training devices. First, simulation with their prescribed AAI; second, evaluation of device switching, without any previous training, by simulating injection with a different AAI (Epipen® or Anapen®, as well as Emerade®-currently unavailable in Portugal). Finally, they were asked which device they liked the best.
Results: Thirty-two patients were enrolled, 16 (50%) females, with a mean (SD) age of 42.9 (±15.8) years; 18 (56%) with hymenoptera venom allergy and 14 (44%) food allergy. Anapen® was prescribed to 15 (47%) and Epipen® to 17 (53%). Six did not acquire any AAI; 21 (66%) admitted carrying it on a daily basis. Eleven (34%) could not demonstrate successful adrenaline administration with their prescribed AAI, 5 with Anapen® and 6 with Epipen®. Nine (60%) of the 15 patients who were prescribed an Anapen® could not administer adrenaline with an Epipen®; 11 (65%) of the 17 with a prescribed Epipen® were unable to use an Anapen®. Only 2 (6%) were incapable of properly managing an Emerade®. The most common error in patients switching from Epipen® to Anapen® was not removing the needle cap (9 patients). In the group switching Anapen® to Epipen®, the most common misuse was not massaging the injection site (10 patients); 6 tried to remove the orange tip as if it was a cap. The preferred AAI was Emerade® in 20 (63%) and Epipen® in 12 (37%).
Conclusions: Patients at-risk for anaphylaxis are provided with portable auto-injectors, educated and trained on their use. One-third of the patients did not always carry them. More than one-third was unable to successfully demonstrate adrenaline administration with their prescribed AAI. Almost two-thirds failed to simulate injection when switched to the alternative one available in Portugal without any training. Design appears to play a role in a successful switch since 94% of the patients changing from either Anapen® or Epipen® to Emerade® were able to correctly use it. It was also the overall preferred auto-injector. These emergency medical devices should be patient friendly.
OP06 Incidence, clinical features, triggers and management of anaphylaxis in the Pediatric Emergency Department of the Tel Aviv Medical Center
Dikla Pivko Levy1, Moshe Ben-Shoshan2, Ayelet Rimon1, Shira Benor1
1Tel Aviv Sourasky Medical Center, Tel Aviv, Israel; 2Montreal Children’s Hospital, Montreal QC, Canada
Correspondence: Dikla Pivko Levy - firstname.lastname@example.org
Clinical and Translational Allergy 2017, 7(Suppl 1):OP06
Introduction: Anaphylaxis is a severe, life threatening systemic hypersensitivity reaction. The diagnosis of anaphylaxis is not always easy to make in the pediatric emergency department (ED) setting. Therefore, children are often dangerously underdiagnosed and undertreated. There is sparse information on the incidence and triggers of anaphylaxis in Israel.
Our objective was to assess the true incidence of anaphylaxis treated in the Pediatric ED, to identify triggers associated with anaphylaxis, to describe the management of anaphylactic reactions and identify potential gaps in diagnosis and treatment.
Methods: A retrospective chart review of cases presenting to the Pediatric ED of the Dana-Dweck Children’s hospital, at the Tel Aviv Sourasky Medical Center between January 1st 2013 to December 31th 2014, with a diagnosis of anaphylaxis or allergic reaction. The clinical features, causative agents, treatment administered and recommendations at discharge were recorded.
Results: During the study period, there were a total of 56,596 visits to the ED. 437 patients were diagnosed with an allergic or anaphylactic reaction. Of these 59 (13.5%) met the diagnostic criteria for anaphylaxis, but only 22 were given the correct diagnosis. The mean age of presentation was 6.9 years, with a male predominance of 66%. Food was the most common causative agent (78%). Specifically, exposure to treenuts (28% (and cow milk (24%) were responsible for a majority of the cases. The majority of children (78% (had known food allergies and presented with breathing difficulties (64%), followed by urticaria (62%). Twenty children (37.7%) were treated with IM adrenaline prior to ED arrival and only fifteen (26%) were treated with IM adrenaline in the ED. Most of the children (86%) were discharged home. Almost 30% were discharged without a prescription to an automated Adrenaline injector.
Conclusion: The rate of anaphylaxis in the study period was 0.1% of all visits to the pediatric ED. Most cases of anaphylaxis were underdiagnosed. As a result, treatment guidelines regarding the use of IM Adrenalin were not always followed and many children were discharged without a prescription for an adrenaline auto-injector.
ORAL ABSTRACT SESSION 2: Clinical aspects • Diagnosis and treatment
OP07 Almond allergy in a cohort of Dutch atopic children: results from 189 oral food challenges with almond
Nicolette J. T. Arends1, Nikki Edelbroek1, Hans de Groot2, Joyce A. M. Emons1, H. Kim A. Brand1, Dirk Verhoeven2, Leonieke N. van Veen2, Nicolette W. de Jong1
1Erasmus MC Sophia Children’s Hospital - Kinderhaven, Rotterdam, the Netherlands; 2Pediatric Department, Reinier de Graaf Groep, Delft, the Netherlands
Correspondence: Nicolette J. T. Arends - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP07
Introduction: Tree nut allergies are common in children, whereas most reported allergic reactions are caused by hazelnut and cashew nut [1,2]. Reactions to these nuts may vary from mild oral allergy symptoms to anaphylaxis. Not much is known about the frequency and severity of almond allergy in children. We therefore evaluated the results of oral food challenges with almond in a large group of Dutch atopic children.
Methods: All open and double-blind placebo-controlled food challenges (DBPCFC) with almond, performed between 2009 and 2015 in two Dutch outpatient clinics were evaluated retrospectively. Skin prick tests (SPT) with almond were performed in most children. Information about previous reactions, reasons for avoidance of almond and presence of atopic diseases (eczema, asthma, allergic rhinitis) were taken from the medical records.
Results: A total of 189 almond challenges were analyzed. Median age of the children was 7.5 years (range 2.0–17.8 years). Almond was removed from the diet for the following reasons: a previous reaction to almond (3.7%), previous reaction to another nut (30.7%), previous reaction to peanut (22.2%), other food allergies (23.8%), a positive test (sensitization) to almond (12.2%), eczema (3.7%), allergic parents (1.1%) and unknown (2.6%). A positive SPT almond was found in 148 children (78.3%). SPT was negative in 28 children (14.8%) and not performed in 13 children (6.9%). 97/101 DBPCFC’s were negative, 2/101 children had a mild reaction and 2/101 children had a doubtful reaction. 86/88 open challenges were negative, 1 child had a mild reaction and 1 child had a doubtful reaction. Reactions were treated with antihistamine. No correlation was found between the outcome of the challenge and SPT results. Sensitization to birch pollen was found in 109 children (57.7%). Sensitization to almond is frequently found in Dutch atopic children. This study shows that most of these sensitizations appear to be clinically irrelevant. Only 6/189 children (3.2%) had a mild reaction and no anaphylaxis was seen. Sensitization might be explained partly by cross-sensitization with birch pollen.
Conclusion: In a large cohort of Dutch atopic children, almond allergy is extremely rare and allergic reactions are only mild.
McWilliam V, Koplin J, LodgeC, Tang M, Dharmage S, Allen K. The prevalence of tree nut allergy: a systematic review. Curr Allergy Asthma Rep. 2015;15:54.
Grabenhenrich L, et al. Anaphylaxis in children and adolescents: The European Anaphylaxis Registry. J Allergy Clin Immunol 2016;137:1128–37.
OP08 Oral tolerance induction using IFN-gamma in patients with anaphylactic food allergy (AFA), non-IgE-mediated food allergy (NFA) in atopic dermatitis (AD) and both AFA and NFA in AD
Geunwoong Noh1, Eun Ha Jang2
1Department of Allergy, Jeju Halla General Hospital, Jeju, Korea Republic; 2Department of Respiratory Medicine, Hanmaeum General Hospital, Jeju, Korea Republic
Correspondence: Geunwoong Noh - firstname.lastname@example.org
Clinical and Translational Allergy 2017, 7(Suppl 1):OP08
Introduction: Food allergy is assessed generally by IgE-mediated laboratory tests. For NFA, gastrointestinal allergy is mainly considered. However, NFA which appears as eczema in atopic dermatitis is also frequent. In this report, typical three groups for food allergy was presented, patients with anaphylactic food allergy (AFA) as a representative IgE-mediated food allergy, patients with NFA which are presented as eczema in AD and patients who had both AFA and NFA in AD. Oral immunotherapy (OIT) using IFN-gamma was conducted successfully in these three groups. The different diagnostic and therapeutic approaches according to the type of food allergy and the clinical and immunological significance are presented.
Case report: Two patients had AFA. Specific IgE for causative foods like milk or eggs are very high and skin prick test for causative foods is also strong positive. AFA was confirmed by oral food challenges. Patients received OIT using IFN-gamma according to the protocol and finally they got the tolerance for causative foods completely. Five patients had food allergy which symptoms is appearing as eczema as AD. Specific IgE and skin prick test for causative foods were negative. Oral food challenges were performed and the appearance of the symptoms and signs of AD is confirmed and the diagnosis was made as NFA as causes of AD. Patients received OIT using IFN-gamma according to the relevant protocol, successfully. Two patients had NFA in AD and AFA. The some foods caused AD by showing eczematous reaction and the other different food provoked anaphylactic reactions, together. The specific IgE and skin prick test for the causative foods is very high for the food allergens of AFA and those for the foods were negative for NFA in AD. OFC was done for the causative foods of AFA and NFA. Patients received OIT using IFN-gamma by the compatible protocol according to the types of food allergy successfully.
Conclusion: Food allergy may be assessed by differentiation as food allergies of IgE- and non-IgE-mediated type. The diagnostic and therapeutic approaches are different according to the types of food allergy. The immunopathogenesis and clinical approach should be done according to the differential diagnosis.
Consent to publish: Written consent provided for publication of this abstract.
OP09 Predicting fish allergy outcome and assessing tolerance at home in a children’s population
Mariona Pascal1, Olga Dominguez2, Mònica Piquer2, Montserrat Alvaro2, Rosa Jimenez-Feijoo2, Jaime Lozano2, Adriana Machinena2, Maria del Mar Folqué2, Maria Teresa Giner2, Ana María Plaza2
1Immunology Department, CDB Hospital Clinic de Barcelona, Barcelona, Spain; 2Department of Allergy and Clinical Immunology, Hospital Sant Joan de Déu, Esplugues de Llobregat, Spain
Correspondence: Mariona Pascal - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP09
Introduction: Fish allergy is relevant in our pediatric population on a Mediterranean diet. Specific IgE (sIgE) tests aid in diagnosis, but oral food challenge is the gold standard. We sought to: (1) analyze the efficiency of sIgE to Gad c 1 and fish whole extracts to avoid challenge and (2) to evaluate maintenance of tolerance of challenged patients at home.
Methods: Children sensitized to fish and/or Gad c 1 reporting or not clinical history of fish allergy were challenged (masked single blind, 16 g protein for ≤12 year-old children and 22 g for older ones). Clinical history was reviewed and sIgE to Gad c 1, fish extracts (ImmunoCAP, ThermoFisher) and challenge test outcomes were analyzed. Tolerance at home was investigated.
Results: 83 patients (67.5% male, median [range] age at OFC: 8[2–15] years-old) were analyzed. 9.6% were only sensitized. Among those reporting symptoms, 26% were anaphylaxis, 43.4% urticaria, 4.8% atopic dermatitis, 8.4% gastrointestinal symptoms, 2.4% dyspnea. All patients were challenged. A total of 221 challenges were done: 71 canned tuna (CT), 72 fresh tuna (FT), 48 hake and 30 sole. Challenge was positive (OFC+) in 2.2% of patients for CT, 12.5% FT, 47.9% hake and 40% for sole. Gad c 1 sIgE was significantly higher in OFC+ patients for FT, hake and sole (p = .0031, <.0001, .0003, respectively) comparing with OFC-ones. Similarly occurred with sIgE to the corresponding extracts in the case of hake and sole (p = .0014 and .0015, respectively). ROC-curve analysis of Gad c 1 and whole extracts tests provided sIgE cut-offs to predict OFC+: Gad c 1: >37.5 kU/L for OFC with FT (AUC:0.80, LH:6.9), >4.7 kU/L for OFC with sole (AUC:0.91, LH:6.6), >3.5 kU/L for OFC with hake (AUC:0.88, LH:7.1). Tuna extract sIgE >15.5 kU/L for OFC with FT (AUC:0.78, LH:6.4), hake extract sIgE >23.5 kU/L for OFC with hake (AUC:0.83, LH:6.6), sole extract sIgE >1.1 kU/L for OFC with sole (AUC:0.89, LH:7).The follow up of tolerance at home showed that 64 (77.1%) patients were not eating the challenged food at home, 25 (39%) mainly for fear or refusal. A total of 49 reactions, of which 17 (34.7%) anaphylaxis, occurred in 39 patients (7 children with several fish species).
Conclusion: Certain sIgE cut-offs for Gad c 1, tuna, hake and sole extracts may aid in fish allergy diagnosis and predicting OFC outcome in our pediatric population. A significant proportion of children that tolerate fish at challenge, suffer allergic reactions when eating fish at home, some of them severe.
OP10 Development and validation of an app to monitor reactions during Oral ImmunoTherapy (OIT)
Paul Turner1, Nandinee Patel1, Marta Vazquez-Ortiz1, Sarah Lindsley1, Lucy Walker2, Simon Rosenberg2
1Imperial College London, London, United Kingdom; 2Illuminatis Ltd, London, United Kingdom
Correspondence: Nandinee Patel - firstname.lastname@example.org
Clinical and Translational Allergy 2017, 7(Suppl 1):OP10
Introduction: Until recently, food allergy management involved complete allergen avoidance, however, data now implies that this may not be required - for example, with regard to extensively heated egg or cow’s milk e.g. in cakes/biscuits. In many countries, oral immunotherapy (OIT) is used as a treatment modality for food allergy, particularly to cow’s milk and increasingly, peanut. However, adverse events are common (occurring in up to 80% of patients). There is a need to develop systems to facilitate safe OIT and allow real-time communication between patients and their treating allergist. Almost 90% of patients/parents now own a smartphone, which can be used to facilitate communication between patients and the clinical team.
Methods: We adapted a digital App called “Tell the Doctor” to allow real-time reporting of symptoms (adverse events, AEs) occurring outside the hospital environment. The App is being tested in an OIT trial in 46 peanut-allergic children. Focus groups were held to collect feedback from study participants, their parents, and members of the study team.
Results: The app was welcomed by both study participants and their families. Feedback was obtained relating to the following areas:
AE reporting was modified to allow rapid and instant alerts to the study team of any significant reactions occurring at home.
Neurological/behavioural changes were separated from cardiovascular symptoms, as there was no evidence that the former are related to the latter.
Study participants were asked to confirm OIT doses taken on a daily basis, thus confirming adherence to study protocol. Patients could also opt-in to a reminder service to prompt them to take both their OIT dose and any asthma preventer medicines by a time of their choosing.
Conclusion: The app facilitates real-time reporting of AEs during OIT studies and was preferred by participants and study team compared to delayed manual paper reporting. We expect electronic reporting to improve the data integrity of OIT-related AEs, and simplify AE reporting, thus improving safety. The advantages of using contemporary/popular communication modalities such as smartphone apps should be considered in the performance of OIT, whether in research or in clinical practice.
Acknowledgements: “Tell the Doctor” App funded by the Nominet Trust.
Trial registration: ClinicalTrials.gov Identifier: NCT02149719
Consent to publish: Informed consent was obtained, NHS HRA approval 15/LO/0287.
OP11 Introducing FABER test for allergy diagnosis: food molecule- and extract-based allergenic preparations in the newest and broadest nanotechnology IgE test
Adriano Mari1, Claudia Alessandri1, Ivana Giangrieco2, Lisa Tuppo2, Chiara Rafaiani1, Georg Mitterer3, Michela Ciancamerla1, Rosetta Ferrara1, Maria Livia Bernardi1, Danila Zennaro1, Maurizio Tamburrini2, Maria Antonetta Ciardiello2, Christian Harwanegg3
1Centri Associati di Allergologia Molecolare (CAAM), Rome, Italy; 2Istituto di Bioscienze e Biorisorse, Consiglio Nazionale delle Ricerche, Naples, Italy; 3MacroarrayDx, Vienna, Austria
Correspondence: Adriano Mari - email@example.com
Clinical and Translational Allergy 2017, 7(Suppl 1):OP11
Introduction: Multiplex tests allow to detect specific IgE to several different preparations at once. They allow patient’s profiling tailoring decisions for interventions. The last ten years have seen the availability of new technologies and when combined can lead to increase diagnostic information from allergy tests.
Our aim was to report about the FABER nanotechnology-based test in food allergy diagnosis.
Methods: FABER 244 IgE test is a new multiplexed in vitro test for specific IgE measurement having 122 molecular allergens and 122 allergenic extracts. Allergenic molecules and extracts, produced in house or obtained from top quality providers in the field, are coupled to chemically activated nanoparticles. Coupling is individually optimized to achieve maximum test performance providing high diagnostic accuracy for each spotted allergenic item. Once coupled they are arrayed to a solid phase matrix to form a one-step comprehensive array based testing solution, using 100 ul of patient serum or plasma.
Results: Extracts from 91 food-borne allergenic sources (fruits, vegetables, eggs, milks, meats, fishes, crustacean, mollusks, snails, mushrooms, anisakis) are arrayed together with 66 allergenic proteins obtained from the same sources. CCD-bearing proteins are included as markers to support test result interpretation, as well as allergenic molecular groups which cross-sectionally belong to food and inhalant sources. Extracts on FABER244 expand the panel overcoming missing of any not yet identified or available allergenic molecule, increasing diagnostic accuracy and comprehensiveness. Test interpretation is supported by CAAM Digital Reporting System (CDRS), a unique online tool available worldwide, allowing visualization on mobile devices of FABER test results. CDRS has been developed for patients to familiarize with the new extended molecule-based results. To be patient-friendly it uses local languages taking advantage of the Allergome platform as the multi-language source. Data on CDRS are shown with tables, graphs, images; comments are generated real time by experts using the Allergome and its external modules, InterAll and ReTiME.
Conclusion: FABER 244 is the most advanced in vitro test for specific IgE detection, including molecules and extracts. It makes available to the molecular allergist an unprecedented quantity of data. The inclusion of allergenic extracts is strategic to confirm or complement results obtained with the single allergenic molecules.