Abstracts from the Food Allergy and Anaphylaxis Meeting 2016 Rome, Italy
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Clin Transl Allergy 2017, 7(Suppl 1):10 DOI 10.1186/s13601-017-0142-2 Clinical and Translational Allergy MEETING ABSTRACTS Open Access Abstracts from the Food Allergy and Anaphylaxis Meeting 2016 Rome, Italy. 13–15 October 2016 Published: 30 March 2017 ORAL ABSTRACT SESSION 1: Food allergens • Anaphylaxis most frequent causes. Older age and male sex are risk factors of fatal anaphylaxis of any cause except for food-induced anaphylaxis. OP01 Fatal anaphylaxis is decreasing in France: analysis of national OP02 data, 1979–2011 Diagnostic workup after severe anaphylaxis Guillaume Pouessel1,2,3, Claire Claverie4, Julien Labreuche5, Jean‑Marie Linus Grabenhenrich1, Margitta Worm1, Sabine Dölle1, Kathrin Scherer2, Renaudin3,6, Aimée Dorkenoo4, Mireille Eb7, Anne Moneret‑Vautrin6, Isidor Hutteger3 Antoine Deschildre2,3, Stephane Leteurtre4 1Charité ‑ Universitätsmedizin Berlin, Berlin, Germany; 2University Hospital 1Department of Pediatrics, Children’s Hospital, Roubaix, France; 2Division Basel, Basel, Switzerland; 3Universitätsklinikum Salzburg, Salzburg, Austria of Pulmonology and Allergology, Department of Pediatrics, Faculty Correspondence: Linus Grabenhenrich - [email protected] of Medicine and Children’s Hospital, Lille, France; 3Allergy Vigilance Clinical and Translational Allergy 2017, 7(Suppl 1):OP02 Network, Vandoeuvre les Nancy, France; 4Université Lille 2, CHU Lille, EA 2694 ‑ Santé Publique: épidémiologie et qualité des soins, Lille, France; Introduction: After a severe anaphylactic reaction, a diagnostic 5Biostatistic Unit, Maison Régionale de la Recherche Clinique, CHRU Lille, workup is recommended to confirm or rule out the elicitor(s) in ques- Lille, France; 6Department of Allergology, Emile Durkheim Hospital, Epi‑ tion. The type of diagnostic chosen is usually based on the elicitor and nal, France; 7Centre d’Epidémiologie sur les Causes Médicales de Décès severity of the reaction and might follow local experiences. We aimed INSERM, CHU de Bicêtre, Le Kremlin‑Bicêtre, France to describe elicitor-specific diagnostic habits in the workup of severe Correspondence: Guillaume Pouessel - [email protected] anaphylaxis, comparing European countries. Clinical and Translational Allergy 2017, 7(Suppl 1):OP01 Methods: The Network for Online Registration of Anaphylaxis (NORA) collected details about elicitors, symptoms and severity, treatment Introduction: Incidence of anaphylaxis is increasing. Data regarding and the diagnostic workup of patients who experienced at least one anaphylaxis mortality are limited, but conflicting. Our objective was to episode of severe anaphylaxis, as documented within medical records document anaphylaxis mortality rate (deaths per million population), of participating tertiary referral centres. time trends and specificities according to triggers (iatrogenic, venom, Results: Between June 2011 and April 2016, the registry collected food, unknown), age groups, sex and geographical regions (North and data for 6465 cases of severe anaphylaxis, 74% of which reported South) in France, between 1979 and 2011. to know the elicitor, with a remaining 20% having only a suspicion Methods: Data were obtained (1) from database of the National and 6% cases of idiopathic anaphylaxis. The allergen was known Mortality Center (CEPIDC) to collect cases in which anaphylaxis was and confirmed by a diagnostic test in 4410 (92% of known elici- included as a cause of death, sex, age, and geographic region of death, tors). Of these, 68% had a reaction to this allergen for the first time, (2) from the database of the National Institute for Economical and Sta- and 32% reported at least one earlier reaction to the same allergen. tistical studies (INSEE) to define the referent populations. We used a In first-time reactors (n 3001) 7% reported that the allergen was multivariable log-linear Poisson regression model to assess the impact confirming by a diagnostic= test already before this reaction, for food of time period, age, sex and geographic region on anaphylaxis deaths. 14%, insects 3%, drugs 2%, and 80% for SIT-induced anaphylaxis. Of Results: During the period study, 1603 deaths were collected: 1564 in cases with recurrent anaphylaxis (n 1409), 30% had a test confirm- adults and 39 in children (age <18 year). The overall prevalence of ana- ing the allergen before the reported= reaction, for food 44%, insects phylaxis fatalities was 0.84 per million population (95% IC 0.80–0.88), 16%, drugs 18%, and 91% for SIT-induced anaphylaxis. Of all diagnos- ranging from 0.08 per million (95% IC 0.05–0.10) in pediatric popu- tically confirmed cases of food-induced anaphylaxis (n 1555), 78% lation to 1.12 per million (95% CI 1.06 to 1.17) in adult population. were assessed by a skin test (SPT, positive in 93%), 90%= by specific Annual percentage change for case fatality rate was 2.0% (95% CI IgE (sIgE, 94% positive), 27% tryptase (7% positive), and 13% under- 4 − 2.5 to 1.5; p < 10− ) indicating a decrease in case fatality rate dur- went an oral food challenge (positive in 88%). Patients with anaphy- ing− the study− period. Anaphylaxis fatality rate was higher in men (1.08 laxis caused by drugs had the following tests (positives of these): SPT per million [95% IC 1.00 1.16] than women (0.86 per million [95% IC 88% (49%), sIgE 31% (46%), tryptase 48% (11%), and provocation 19% 4 0.80–0.92]) (p < 10− ). Triggers of anaphylaxis fatalities were iatrogenic (68%). For reactions against insect venom: SPT 79% (84%), sIgE 98% (63%), mostly drugs, venom (14%) and food (0.6%). Unspecified ana- (97%), and tryptase 93 (8%). Irrespective of the elicitor, SPTs were per- phylaxis was frequent (23%). The highest rate was in persons aged formed more often in Austria, Ireland and Greece (92, 96, and 99%, >70 years (3.50 per million population per year [95% IC 3.25–3.76]) and respectively), and less often in Italy (64%). Tryptase was almost never 4 the lowest in the pediatric population (p < 10− ). Only venom-induced measured in Ireland, Greece and France, whereas determination of mortality rate was higher in South of France (0.16 per million [95% IC specific IgE was carried out similarly between European countries. 0.13–0.19]) compared with the North (0.11 per million [95% IC 0.09– Conclusion: The choice of diagnostic measure depended on the elicitor 0.13]) (p 0.004). Only 8 food-induced fatalities were recorded (age and varied by country. Especially the assessment of tryptase is handled <35 years= in 7 cases). very differently between allergens in question and countries. These dif- Conclusion: Overall anaphylaxis mortality rate is decreasing over the ferences may indicate aspects of the diagnostic workup with a certain three last decades in France. We confirm that iatrogenic causes are the degree of ambiguity, which might benefit from further harmonization. © The Author(s) 2017. 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Clin Transl Allergy 2017, 7(Suppl 1):10 Page 2 of 79 OP03 corticosteroid, or antihistamine were compared with recommended Primary sensitisation versus co‑sensitisation to hydrolysed wheat adrenalin treatment according to the algorithm in Sampson 1–5. protein Results: Out of 346 challenges scored as grade 4 anaphylaxis, 296 were Morten Christensen, Carsten Bindslev‑Jensen, Charlotte Mortz terminated due to respiratory symptoms requiring adrenalin according Department of Dermatology and Allergy Centre, Odense Research Center to Sampson 1–5, i.e. “barky cough, hoarseness, difficulty swallowing” for Anaphylaxis (ORCA), Odense University Hospital, Odense, Denmark (laryngeal, n 79), “wheezing, dyspnea, cyanosis” (lower resp. n 181) Correspondence: Morten J. Christensen ‑ [email protected] or both (n 36).= Nine of the 115 patients with laryngeal symptoms= were Clinical and Translational Allergy 2017, 7(Suppl 1):OP03 treated with= adrenalin, all due to inspiratory stridor. No patients with lower respiratory symptoms received adrenalin, but the majority were Introduction: Wheat protein is responsible for various phenotypes of aller- treated with β2 agonists (188/217), whereas in 30 challenges, symptoms gic diseases. More recently an increased number of immediate type 1 aller- disappeared without treatment or only antihistamine for concomitant gic reactions to hydrolyzed wheat proteins (HWP) have been reported. urticaria were used. Patients solely with laryngeal symptoms received The aim of this study was to characterize the clinical profile and evalu- β2-agonists in 16 challenges, but the majority of them (54/79) received ate patients with a case-history of anaphylaxis related to ingestion of a no treatment or only antihistamine. The 36 patients with both laryn- product containing HWP. Furthermore, to describe patients with other geal and lower respiratory symptoms were treated in same manner as types of wheat allergy co-sensitized for HWP. patients with only lower respiratory symptoms, i.e. β2 agonist for their Methods: From May 2010 to August 2015 we investigated 56 patients bronchial