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Shin H, Lyons JJ. Alpha-Tryptase as a Risk-Modifying Factor for Mast Cell-Mediated Reactions. Curr Allergy Asthma Rep 2024; 24:199-209. [PMID: 38460022 DOI: 10.1007/s11882-024-01136-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/12/2024] [Indexed: 03/11/2024]
Abstract
PURPOSE OF REVIEW To provide an overview on the current understanding of genetic variability in human tryptases and summarize the literature demonstrating the differential impact of mature tryptases on mast cell-mediated reactions and associated clinical phenotypes. RECENT FINDINGS It is becoming increasingly recognized that tryptase gene composition, and in particular the common genetic trait hereditary alpha-tryptasemia (HαT), impacts clinical allergy. HαT has consistently been associated with clonal mast cell disorders (MCD) and has also been associated with more frequent anaphylaxis among these patients, and patients in whom no allergic trigger can be found, specifically idiopathic anaphylaxis. Additionally, more severe anaphylaxis among Hymenoptera venom allergy patients has been linked to HαT in both retrospective and prospective studies. An increased relative number of α-tryptase-encoding gene copies, even in the absence of HαT, has also been associated with systemic mastocytosis and has been shown to positively correlate with the severity of mast cell-mediated reactions to vibration and food. These findings may be due to increased generation of α/β-tryptase heterotetramers and differences in their enzymatic activity relative to β-tryptase homotetramers. HαT is a naturally occurring overexpression model of α-tryptase in humans. Increased relative α-tryptase expression modifies immediate hypersensitivity symptoms and is associated with more frequent and severe mast cell-mediated reactions, ostensibly due to increased α/β-tryptase heterotetramer production.
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Affiliation(s)
- Hannah Shin
- Division of Allergy & Immunology, Department of Medicine, University of California San Diego, La Jolla, CA, USA
| | - Jonathan J Lyons
- Division of Allergy & Immunology, Department of Medicine, University of California San Diego, La Jolla, CA, USA.
- Veterans Affairs San Diego Healthcare System, La Jolla, CA, USA.
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Valent P, Akin C, Arock M. Reversible Elevation of Tryptase Over the Individual's Baseline: Why is It the Best Biomarker for Severe Systemic Mast Cell Activation and MCAS? Curr Allergy Asthma Rep 2024; 24:133-141. [PMID: 38308674 PMCID: PMC10960756 DOI: 10.1007/s11882-024-01124-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/03/2024] [Indexed: 02/05/2024]
Abstract
PURPOSE OF REVIEW Mast cell (MC) activation syndromes (MCAS) are conditions defined by recurrent episodes of severe systemic anaphylaxis or similar systemic events triggered by MC-derived mediators that can be measured in biological fluids. Since some symptoms of MC activation may occur due to other, non-MC etiologies and lead to confusion over diagnosis, it is of crucial importance to document the involvement of MC and their products in the patients´ symptomatology. RECENT FINDINGS The most specific and generally accepted marker of severe systemic MC activation is an event-related, transient increase in the serum tryptase level over the individual baseline of the affected individual. However, baseline concentrations of serum tryptase vary among donors, depending on the genetic background, age, kidney function, and underlying disease. As a result, it is of critical importance to provide a flexible equation that defines the diagnostic increase in tryptase qualifying as MCAS criterion in all patients, all situations, and all ranges of baseline serum tryptase. In 2012, the consensus group proposed the 120% + 2 ng/ml formula, which covers the great majority of groups, including cases with low, normal, or elevated basal serum tryptase level. This formula has been validated in subsequent studies and has proven to be a robust and consistent diagnostic criterion of MCAS. The present article is discussing the impact of this formula and possible limitations as well as alternative markers and mediators that may be indicative of MCAS.
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Affiliation(s)
- Peter Valent
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, Medical University of Vienna, Vienna, Austria.
- Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria.
| | - Cem Akin
- Division of Allergy and Clinical Immunology, University of Michigan, Ann Arbor, MI, USA
| | - Michel Arock
- Platform of Molecular Analysis for Mastocytosis and MCAD (CEREMAST), Department of Biological Hematology, Pitié-Salpêtrière Hospital, AP-HP, Paris Sorbonne University, Paris, France
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Lang A, Kubala S, Grieco MC, Mateja A, Pongracic J, Liu Y, Frischmeyer-Guerrerio PA, Kumar R, Lyons JJ. Severe food allergy reactions are associated with α-tryptase. J Allergy Clin Immunol 2023; 152:933-939. [PMID: 37558059 PMCID: PMC10592152 DOI: 10.1016/j.jaci.2023.07.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 07/18/2023] [Accepted: 07/31/2023] [Indexed: 08/11/2023]
Abstract
BACKGROUND Increased TPSAB1 copy numbers encoding ⍺-tryptase are associated with severe reactions in adults with Hymenoptera venom allergy, systemic mastocytosis, and idiopathic anaphylaxis. OBJECTIVE The primary objective was to assess the association between ⍺-tryptase and severity of food allergy. METHODS A total of 119 subjects underwent tryptase genotyping; 82 of them were from an observational food allergy cohort at the National Institute of Allergy and Infectious Disease (NIAID), and 37 were from a cohort of children who reacted to peanut oral food challenge (OFC) at Lurie Children's Hospital of Chicago. The primary predictor was presence or absence of ⍺-tryptase. The primary outcomes for both cohorts were measures of severity of food allergy reaction. Secondary outcomes included OFC symptom scores (Bock/Practical Allergy [PRACTALL] and Severity Grading Score for Acute Reactions [SGSAR]). Correlation between total α-tryptase isoforms and OFC scores was also assessed to account for gene dosage effects. RESULTS Among the subjects in the NIAID cohort, the presence of ⍺-tryptase was associated with a higher prevalence of food-triggered anaphylaxis than in those with only β-tryptase (P = .026). Similarly, only 1 of 6 subjects in the OFC cohort with only β-tryptase (17%) had a severe reaction, whereas 20 of 31 of subjects with α-tryptase (65%) had a severe reaction (P = .066). Subjects with ⍺-tryptase also had higher total SGSAR scores than did the subjects with no ⍺-tryptase (P = .003). In addition, there were also significant positive correlations between ⍺-tryptase isoform copy numbers and both higher total SGSAR and Bock/PRACTALL OFC scores (P = .008 and P = .003, respectively). CONCLUSION The presence of α-tryptase in subjects is correlated with a higher prevalence of anaphylaxis or severe reaction to food than in subjects without any α-tryptase.
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Affiliation(s)
- Abigail Lang
- Division of Allergy and Immunology, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Ill; Northwestern University Feinberg School of Medicine, Chicago, Ill.
| | - Stephanie Kubala
- Food Allergy Research Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md
| | - Megan C Grieco
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md; Department of Biostatistics, Rollins School of Public Health, Emory University, Atlanta, Ga
| | - Allyson Mateja
- Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research, Frederick, Md
| | - Jacqueline Pongracic
- Division of Allergy and Immunology, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Ill; Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Yihui Liu
- Translational Allergic Immunopathology Unit, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md
| | - Pamela A Frischmeyer-Guerrerio
- Food Allergy Research Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md
| | - Rajesh Kumar
- Division of Allergy and Immunology, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Ill; Northwestern University Feinberg School of Medicine, Chicago, Ill
| | - Jonathan J Lyons
- Translational Allergic Immunopathology Unit, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md
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Nasr I, Mahdi AS, Al Shekaili J, Nasr I, Al Wahshi H, Al Juma S, Al Shukeili L, Al Zakwani I, Al Salmi I. Real World Management of Anaphylaxis Versus the National Institute for Health and Clinical Excellence (NICE) Guidelines. Cureus 2022; 14:e29336. [PMID: 36277549 PMCID: PMC9581108 DOI: 10.7759/cureus.29336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/19/2022] [Indexed: 11/05/2022] Open
Abstract
Objectives Anaphylaxis is an acute, life-threatening immediate allergic reaction caused by the sudden systemic release of mediators from mast cells. This study aims to assess the current practice of emergency management of children and adults diagnosed with anaphylaxis at the Royal Hospital, Muscat, Oman, in line with the National Institute for Health and Clinical Excellence (NICE) guidelines. Methods This is an observational retrospective study of all anaphylaxis cases seen at the emergency department (ED) from January 2013 to January 2018 and compared with the management of anaphylaxis in the ED as per the NICE guidelines. Inclusion criteria were all patients, children (age 16 and below), and adults diagnosed with anaphylaxis based on the World Allergy Organization (WAO) criteria. Exclusion criteria are all cases labeled as anaphylaxis that did not match the WAO criteria for anaphylaxis. Results Of 100 patients with a preliminary diagnosis of anaphylaxis, 49 patients (49%) were true-anaphylaxis cases based on the WAO definition 16 were children (age 16 years and below), and 33 were adults ( age 16 years and above). The other 51 patients (51%) with misdiagnosed anaphylaxis were later diagnosed with spontaneous urticaria, septic shock, vocal cord dysfunction, severe asthma, and anxiety attack. All 49 patients with true-anaphylaxis appropriately received adrenaline intramuscularly at the ED. All 16 children were admitted, seen by an allergist, and received an adrenaline auto-injector when indicated. Only 5 of the 33 adults were admitted and seen by an allergist, and 4 of those required an adrenaline auto-injector upon discharge. The remaining 28 adults were discharged from the ED, and only 3 of these were referred to the allergist. None received an adrenaline auto-injector upon discharge from the ED, and no mention in the ED notes on patient education regarding allergen avoidance. Conclusion Third of the patients who presented to ED were children (<16 years), and two third were adults. Insect venom was the main reason for anaphylaxis in both age groups. There was an underutilization of adrenaline auto-injector prescriptions for adult patients. This could be very well improved by disseminating policies and guidelines to adult physicians.
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Lyons JJ, Greiner G, Hoermann G, Metcalfe DD. Incorporating Tryptase Genotyping Into the Workup and Diagnosis of Mast Cell Diseases and Reactions. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY. IN PRACTICE 2022; 10:1964-1973. [PMID: 35597543 DOI: 10.1016/j.jaip.2022.05.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 04/29/2022] [Accepted: 05/10/2022] [Indexed: 12/18/2022]
Abstract
The measurement of mast cell tryptase levels in serum has found utility in the diagnosis and management of both clonal mast cell disorders and severe mast cell-dependent systemic reactions in the form of anaphylaxis. A more recent discovery is that a majority of individuals with elevated basal serum tryptase levels have increased germline TPSAB1 gene copy number encoding α-tryptase. This genetic trait is referred to as hereditary α-tryptasemia (HαT) and affects nearly 6% of the general population. In clinical practice, the presence or absence of HαT should thus now be determined when defining what constitutes an abnormal serum tryptase level in the diagnosis of mastocytosis. Further, as rises in serum tryptase levels are used to support the diagnosis of systemic anaphylaxis, variability in baseline serum tryptase levels should be factored into how significant a rise in serum tryptase is required to confirm the diagnosis of a systemic allergic reaction. In practicality, this dictates that symptomatic individuals undergoing evaluation for a mast cell-associated disorder or reaction with a baseline serum tryptase level exceeding 6.5 ng/mL should be considered for tryptase genotyping in order to screen for HαT. This review provides detailed information on how to use the results of such testing in the diagnosis and management of both mastocytosis and anaphylaxis.
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Affiliation(s)
- Jonathan J Lyons
- Translational Allergic Immunopathology Unit, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md.
| | - Georg Greiner
- Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria; Ihr Labor, Medical Diagnostic Laboratories Vienna, Vienna, Austria; Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Gregor Hoermann
- Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria; MLL Munich Leukemia Laboratory, Munich, Germany
| | - Dean D Metcalfe
- Mast Cell Biology Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Md
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Li X, Ma Q, Yin J, Zheng Y, Chen R, Chen Y, Li T, Wang Y, Yang K, Zhang H, Tang Y, Chen Y, Dong H, Gu Q, Guo D, Hu X, Xie L, Li B, Li Y, Lin T, Liu F, Liu Z, Lyu L, Mei Q, Shao J, Xin H, Yang F, Yang H, Yang W, Yao X, Yu C, Zhan S, Zhang G, Wang M, Zhu Z, Zhou B, Gu J, Xian M, Lyu Y, Li Z, Zheng H, Cui C, Deng S, Huang C, Li L, Liu P, Men P, Shao C, Wang S, Ma X, Wang Q, Zhai S. A Clinical Practice Guideline for the Emergency Management of Anaphylaxis (2020). Front Pharmacol 2022; 13:845689. [PMID: 35418863 PMCID: PMC8996305 DOI: 10.3389/fphar.2022.845689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 02/23/2022] [Indexed: 11/13/2022] Open
Abstract
Background: For anaphylaxis, a life-threatening allergic reaction, the incidence rate was presented to have increased from the beginning of the 21st century. Underdiagnosis and undertreatment of anaphylaxis are public health concerns. Objective: This guideline aimed to provide high-quality and evidence-based recommendations for the emergency management of anaphylaxis. Method: The panel of health professionals from fifteen medical areas selected twenty-five clinical questions and formulated the recommendations with the supervision of four methodologists. We collected evidence by conducting systematic literature retrieval and using the Grading of Recommendations, Assessment, Development, and Evaluation (GRADE) approach. Results: This guideline made twenty-five recommendations that covered the diagnosis, preparation, emergency treatment, and post-emergency management of anaphylaxis. We recommended the use of a set of adapted diagnostic criteria from the American National Institute of Allergy and Infectious Diseases and the Food Allergy and Anaphylaxis Network (NIAID/FAAN), and developed a severity grading system that classified anaphylaxis into four grades. We recommended epinephrine as the first-line treatment, with specific doses and routes of administration for different severity of anaphylaxis or different conditions. Proper dosage is critical in the administration of epinephrine, and the monitor is important in the IV administration. Though there was only very low or low-quality evidence supported the use of glucocorticoids and H1 antagonists, we still weakly recommended them as second-line medications. We could not make a well-directed recommendation regarding premedication for preventing anaphylaxis since it is difficult to weigh the concerns and potential effects. Conclusion: For the emergency management of anaphylaxis we conclude that: • NIAID/FAAN diagnostic criteria and the four-tier grading system should be used for the diagnosis • Prompt and proper administration of epinephrine is critical.
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Affiliation(s)
- Xiaotong Li
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,School of Pharmaceutical Science, Peking University, Beijing, China.,Institute for Drug Evaluation, Peking University Health Science Center, Beijing, China
| | - Qingbian Ma
- Emergency Department, Peking University Third Hospital, Beijing, China
| | - Jia Yin
- Department of Allergy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ya'an Zheng
- Emergency Department, Peking University Third Hospital, Beijing, China
| | - Rongchang Chen
- State Key Laboratory for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yuguo Chen
- Department of Emergency Medicine and Chest Pain Center, Qilu Hospital of Shandong University, Institute of Emergency and Critical Care Medicine of Shandong University, Ji'nan, China
| | - Tianzuo Li
- Department of Anesthesiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Yuqin Wang
- Pharmacy Department, Xuanwu Hospital of Capital Medical University, Beijing, China
| | - Kehu Yang
- Evidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China
| | - Hongjun Zhang
- Departments of Nursing, Peking University Third Hospital, Beijing, China
| | - Yida Tang
- Department of Internal Medicine, Coronary Heart Disease Center, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yaolong Chen
- Evidence-Based Medicine Center, School of Basic Medical Sciences, Lanzhou University, Lanzhou, China
| | - Hailong Dong
- Department of Anesthesiology and Perioperative Medicine, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | - Qinglong Gu
- Department of Otolaryngology, Children's Hospital Affiliated to Capital Institute of Pediatrics, Beijing, China
| | - Daihong Guo
- Pharmacy Department, Chinese PL A General Hospital, Beijing, China
| | - Xuehui Hu
- Department of Nursing, Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | - Lixin Xie
- Department of Pulmonary and Critical Care Medicine, Chinese PLA General Hospital, Beijing, China
| | - Baohua Li
- Departments of Nursing, Peking University Third Hospital, Beijing, China
| | - Yuzhen Li
- Department of Pharmacy, Peking University People's Hospital, Beijing, China
| | - Tongyu Lin
- State Key Laboratory of Oncology in South China, Department of Medical Oncology, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Fang Liu
- Department of Pharmacy, Peking University Third Hospital, Beijing, China
| | - Zhiqiang Liu
- Department of Anesthesiology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, China
| | - Lanting Lyu
- School of Public Administration and Policy, Renmin University of China, Beijing, China.,Health Technology Assessment and Health Policy Research Group at Renmin University of China, Beijing, China
| | - Quanxi Mei
- Department of Pharmacy, Shenzhen Bao'an Pure Chinese Medicine Treatment Hospital, Shenzhen, China
| | - Jie Shao
- Department of Pediatrics, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Huawen Xin
- Department of Clinical Pharmacology, General Hospital of Central Theater Command of PLA, Wuhan, China
| | - Fan Yang
- Institute of Antibiotics, Huashan Hospital Fudan University, Shanghai, China
| | - Hui Yang
- Departments of Nursing, The First Hospital of Shanxi Medical University, Taiyuan, China
| | - Wanhua Yang
- Department of Pharmacy, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xu Yao
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China
| | - Chunshui Yu
- Department of Radiology and Tianjin Key Laboratory of Functional Imaging, Tianjin Medical University General Hospital, Tianjin, China
| | - Siyan Zhan
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
| | - Guoqiang Zhang
- Department of Emergency, China-Japan Friendship Hospital, Beijing, China
| | - Minggui Wang
- Institute of Antibiotics, Huashan Hospital Fudan University, Shanghai, China
| | - Zhu Zhu
- Department of Pharmacy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing, China
| | - Baoguo Zhou
- Department of General Surgery, The First Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Jianqing Gu
- Department of Allergy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Mo Xian
- State Key Laboratory for Respiratory Disease, Guangzhou Institute of Respiratory Health, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yuan Lyu
- Department of Emergency Medicine and Chest Pain Center, Qilu Hospital of Shandong University, Institute of Emergency and Critical Care Medicine of Shandong University, Ji'nan, China
| | - Zhengqian Li
- Department of Anesthesiology, Peking University Third Hospital, Beijing, China
| | - Hangci Zheng
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,School of Pharmaceutical Science, Peking University, Beijing, China
| | - Chang Cui
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,School of Pharmaceutical Science, Peking University, Beijing, China
| | - Shuhua Deng
- Departments of Nursing, Peking University Third Hospital, Beijing, China
| | - Chao Huang
- National Center for Medical Service Administration, National Health Commission of the People's Republic of China, Beijing, China
| | - Lisha Li
- Department of Allergy, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Pengfei Liu
- Department of Anesthesiology, Beijing Shijitan Hospital, Capital Medical University, Beijing, China
| | - Peng Men
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,School of Pharmaceutical Science, Peking University, Beijing, China
| | - Chunli Shao
- Department of Internal Medicine, Coronary Heart Disease Center, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Sai Wang
- Pharmacy Department, Xuanwu Hospital of Capital Medical University, Beijing, China
| | - Xiang Ma
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,Department of Physiology, Oklahoma University Health Science Center, Oklahoma City, OK, United States
| | - Qiang Wang
- National Center for Medical Service Administration, National Health Commission of the People's Republic of China, Beijing, China
| | - Suodi Zhai
- Department of Pharmacy, Peking University Third Hospital, Beijing, China.,Institute for Drug Evaluation, Peking University Health Science Center, Beijing, China
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Mateja A, Wang Q, Chovanec J, Kim J, Wilson KJ, Schwartz LB, Glover SC, Carter MC, Metcalfe DD, Brittain E, Lyons JJ. Defining baseline variability of serum tryptase levels improves accuracy in identifying anaphylaxis. J Allergy Clin Immunol 2022; 149:1010-1017.e10. [PMID: 34425177 PMCID: PMC9126046 DOI: 10.1016/j.jaci.2021.08.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Revised: 07/16/2021] [Accepted: 08/12/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND Acute increases of ≥20% + 2 ng/mL (20 + 2 rule) over basal serum tryptase (BST) is the recommended threshold supporting a clinical diagnosis of anaphylaxis. Prospective studies have demonstrated high sensitivity for this algorithm after parenteral exposure, but specificity has not been evaluated. OBJECTIVE We sought to define a serum tryptase change that distinguishes baseline variability from anaphylaxis on the basis of intraindividual variation in BST. METHODS Ninety-three total subjects with atopy (n = 62) or hereditary α-tryptasemia (HαT) (n = 31) and ≥2 BST measurements were identified. Sequential BST variability measurements were modeled and threshold ratios that optimized sensitivity and/or specificity determined. Models were tested in 22 individuals with physician-diagnosed anaphylaxis and validated in independent cohorts of individuals with HαT (n = 33), indolent systemic mastocytosis (ISM) (n = 52), and ISM + HαT (n = 12). Mature tryptase levels were measured in HαT (n = 19) and ISM (n = 20). An online application was developed for clinical use. RESULTS As a result of BST variability, 9.7% (9/93) of primary cohort patients, and 18% (6/33) of HαT, 30% (16/53) of ISM, and 25% (3/12) of ISM + HαT patients from validation cohorts met the 20 + 2 rule despite absent immediate hypersensitivity symptoms; mature tryptase was noncontributory among individuals with HαT or ISM at baseline. A ratio of acute tryptase/BST exceeding 1.685 provided the optimized diagnostic rule for jointly maximizing sensitivity and specificity. Statistically significant improvement in specificity relative to the 20 + 2 rule was observed among individuals with elevated BST caused by HαT and ISM. CONCLUSIONS Using an acute tryptase/BST ratio of 1.685 improves specificity of measured changes among individuals with HαT and ISM while maintaining high sensitivity for confirmation of anaphylaxis.
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Affiliation(s)
- Allyson Mateja
- Clinical Monitoring Research Program Directorate, Frederick National Laboratory for Cancer Research
| | - Qinlu Wang
- Bioinformatics and Computational Biosciences Branch, Office of Cyber Infrastructure and Computational Biology, NIAID, NIH, Bethesda, MD
| | - Jack Chovanec
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Jiwon Kim
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Kenneth J. Wilson
- Division of Digestive Diseases, Department of Medicine, University of Mississippi Medical Center, Jackson, MS
| | - Lawrence B. Schwartz
- Department of Internal Medicine, Division of Rheumatology, Allergy and Immunology, Virginia Commonwealth University, Richmond, VA
| | - Sarah C. Glover
- Division of Digestive Diseases, Department of Medicine, University of Mississippi Medical Center, Jackson, MS,Division of Gastroenterology, Department of Medicine, University of Florida, Gainesville, FL
| | - Melody C. Carter
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Dean D. Metcalfe
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Erica Brittain
- Biostatistics Research Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD
| | - Jonathan J. Lyons
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD,Correspondence: Dr. Jonathan Lyons, NIH/NIAID/LAD, 9000 Rockville Pike, Building 29B, Room 5NN18, MSC 1889, Bethesda, MD 20892, Phone: (301) 443-5250, Fax: (301) 480-8384,
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Abstract
Purpose of Review The purpose of this review is to provide a better understanding of anaphylaxis pathophysiology and describe the underlying mechanisms, effector cells, and the potential biomarkers involved depending on the anaphylaxis endotypes. Recent Findings New insight into the potential relevance of pathways others than IgE-dependent anaphylaxis has been unraveled, as well as other biomarkers than tryptase, such as the role of platelet activation factor, basogranulin, dipeptidyl peptidase I, CCL-2, and other cytokines. Summary Gaining knowledge of all the mediators and cellular activation/communication pathways involved in each endotype of anaphylaxis will allow the application of precision medicine in patients with anaphylactic reactions, providing insights to the most appropriate approach in each case and helping to stratify severity and risk prediction.
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Röntynen P, Kukkonen K, Savinko T, Mäkelä MJ. Optimizing tools for evaluating challenge outcomes in children with cashew nut allergy. Ann Allergy Asthma Immunol 2021; 128:270-278. [PMID: 34896310 DOI: 10.1016/j.anai.2021.12.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 11/02/2021] [Accepted: 12/01/2021] [Indexed: 11/26/2022]
Abstract
BACKGROUND The incidence of cashew nut anaphylaxis is increasing and there is a need for accurate diagnostic tests. Age-specific cutoffs in children are lacking. Changes in serum tryptase levels are not well documented in pediatric food allergy, except in anaphylaxis. OBJECTIVE To evaluate the ability of various tests to diagnose cashew nut allergy and to predict reaction severity. We also investigated changes in tryptase and their correlation to reaction severity. METHODS We performed an open cashew nut challenge on 106 children (aged 1-16 years), who were sensitized to cashew nut with either previous allergic reaction to cashew nut or no known exposure. We analyzed the accuracy of Ana o 3 immunoglobulin E (IgE), cashew nut IgE, skin prick test, basophil activation test (BAT), and combinations thereof to diagnose cashew nut allergy and to predict reaction severity. Tryptase level was measured at the baseline and during an allergic reaction. RESULTS A total of 72 children had positive challenge outcomes. Ana o 3 IgE seemed to be the best single test to diagnose cashew allergy, with a 0.97 kU/L cutoff exhibiting 94.1% specificity and 61.1% sensitivity. Though BAT values of at least 22.8% best predicted reaction severity, with 91.7% specificity and 60.7% sensitivity, the cutoffs were age-specific. Tryptase levels increased substantially 1 to 2 hours after the first allergic symptoms compared with baseline. CONCLUSION Ana o 3 IgE seems to be the best diagnostic test in pediatric cashew nut allergy, and test combinations do not seem to improve the diagnostics. Cutoffs are age-specific. BAT is promising in predicting reaction severity. Tryptase levels should be measured 1 to 2 hours after initiation of an allergic reaction.
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Affiliation(s)
- Petteri Röntynen
- Skin and Allergy Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
| | - Kaarina Kukkonen
- Children's Hospital and Pediatric Research Center, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Terhi Savinko
- Skin and Allergy Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Mika J Mäkelä
- Skin and Allergy Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
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Srisuwatchari W, Tacquard CA, Borushko A, Viville S, Stenger R, Ehrhard Y, Malinovsky JM, Mertes PM, Demoly P, Chiriac AM. Diagnostic performance of serial serum total tryptase measurement to differentiate positive from negative allergy testing among patients with suspected perioperative hypersensitivity. Clin Exp Allergy 2021; 52:334-344. [PMID: 34741356 DOI: 10.1111/cea.14040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 09/27/2021] [Accepted: 10/28/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Serum total tryptase has been shown to increase during acute allergic reactions (acute tryptase, TA ); however, few studies have investigated the values of TA or a combination of TA and baseline tryptase (TB ) to discriminate positive from negative testing in perioperative hypersensitivity reaction (POH) allergy work up. The aim of this study was to determine the diagnostic performance of TA in order to differentiate positive from negative allergy testing suspected POH and analyze the diagnostic performance of serial tryptase levels using several formulas. METHODS All patients from the University hospital of Montpellier and Strasbourg, France who presented with suspected POH and underwent complete drug allergy work-up between March 2011 and December 2019 with available TA and TB were included. Four formulas, including a change in TA >11 (F1), or >2+1.2xTB (F2), or >3+TB (F3), or >120%TB (F4), were applied. RESULTS One hundred and sixty-two patients were included, and 131 of them (80.8%) had grade III or IV reactions. Ninety patients had positive allergy testing. The optimal cut-off value of TA to distinguish positive from negative allergy testing patients was 9.8 μg/L with an AUC of 0.817 (95%CI: 0.752-0.882, p<0.001). The 93% PPV threshold for TA was 33 μg/L (95.8% specificity). Paired tryptase levels according to formulas F2 and F3 yielded the highest Youden index (0.54 and 0.53, respectively). CONCLUSION The optimal cut-off point for TA for distinguishing positive from negative allergy testing suspected POH was 9.8 μg/L. TA value of 33 μg/L was required to achieve >90% PPV.
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Affiliation(s)
- Witchaya Srisuwatchari
- Department of Pulmonology, Division of Allergy, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Univ Montpellier, France.,Division of Allergy and Immunology, Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | | | - Anna Borushko
- Department of Pulmonology, Division of Allergy, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Univ Montpellier, France.,Allergology and Occupational Pathology Course, Belarusian Medical Academy of Post-Graduate Education, Minsk, Belarus
| | - Simon Viville
- Department of Anesthesia and Intensive Care, Strasbourg University Hospital, Strasbourg, France
| | - Rodolphe Stenger
- Chest Diseases Department, Strasbourg University Hospital, Strasbourg, France
| | - Yoann Ehrhard
- Department of Pulmonology, Division of Allergy, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Univ Montpellier, France
| | - Jean-Marc Malinovsky
- Département d'Anesthésie-Réanimation, Centre Hospitalier Universitaire de Reims, Hopital Maison Blanche, Reims, France
| | - Paul-Michel Mertes
- Department of Anesthesia and Intensive Care, Strasbourg University Hospital, Strasbourg, France
| | - Pascal Demoly
- Department of Pulmonology, Division of Allergy, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Univ Montpellier, France.,UA11 Institute, Desbrest of Epidemiology and Public Health, INSERM, Univ Montpellier, Montpellier, France
| | - Anca-Mirela Chiriac
- Department of Pulmonology, Division of Allergy, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier, Univ Montpellier, France.,UA11 Institute, Desbrest of Epidemiology and Public Health, INSERM, Univ Montpellier, Montpellier, France
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11
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D'Errico S, Santurro A, Scopetti M, Frati P, Fineschi V. Fatal food-induced anaphylaxis: Determination of tryptase and specific IgE on cadaveric blood samples. What else for a better methodological standard? Int J Immunopathol Pharmacol 2021; 34:2058738420950579. [PMID: 33016835 PMCID: PMC7543114 DOI: 10.1177/2058738420950579] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Post-mortem investigation in cases of fatal anaphylaxis is required to provide
clarifications on the presence of macroscopic pathological changes, histological
features, and immunohistochemical positivity suggestive of the diagnosis, on
biochemical evidence of anaphylaxis and on the presence of serological data
indicative of the allergen responsible for the anaphylactic reaction. We
describe the case of a 16-year-old boy with a medical history of allergic
asthma, celiac disease, and known food-induced allergy for fish, fresh milk,
peanuts, hazelnuts, walnuts, apples, kiwis, and peaches. Acute onset of dyspnea
followed by cyanosis of the lips and respiratory failure was described
immediately after having an ice cream sandwich. Unsuccessful rescues were
immediately attempted with oral administration of betamethasone, intramuscular
injection of adrenaline, and cardiopulmonary resuscitation. A complete
post-mortem examination was performed. Serum dosage of mast cell beta-tryptase
from femoral blood detecting serum values of 41.4 mg/l. Determination of
specific IgE on cadaveric blood samples confirmed the anamnestic data related to
sensitization for several food allergens, including cod parvalbumin,
tropomyosin, brazil nut, omega-5-gliadin of foods derived from wheat and gluten.
The cause of death was identified in a cardiorespiratory failure due to
anaphylactic shock in a poly-allergic subject and anaphylaxis was ascribed to
the wheat contained in the ice cream sandwich eaten immediately before the onset
of respiratory symptoms. The need is to implement an interdisciplinary approach
capable to ascertain the sensitivity and specificity of the diagnostic tests
currently in use as well as to evaluate the possibility of introducing new
biomarkers in practice.
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Affiliation(s)
- Stefano D'Errico
- Legal Medicine Division, Sant'Andrea University Hospital, Rome, Italy
| | - Alessandro Santurro
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, Rome, Italy
| | - Matteo Scopetti
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, Rome, Italy
| | - Paola Frati
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, Rome, Italy
| | - Vittorio Fineschi
- Department of Anatomical, Histological, Forensic and Orthopaedic Sciences, Sapienza University of Rome, Rome, Italy
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12
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Lyons JJ. Inherited and acquired determinants of serum tryptase levels in humans. Ann Allergy Asthma Immunol 2021; 127:420-426. [PMID: 34175497 DOI: 10.1016/j.anai.2021.06.019] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Revised: 06/06/2021] [Accepted: 06/19/2021] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To aid the clinician in correctly interpreting serum tryptase levels. DATA SOURCES Primary peer-reviewed literature. STUDY SELECTIONS Clinical and basic science peer-reviewed studies characterizing the genetic and physiological bases for tryptase generation, secretion, and elevation, including those describing serum tryptase levels in population-based cohort studies. RESULTS Clinically measured basal serum tryptase (BST) consists of ostensibly inactive alpha- and beta-tryptase precursors. The autosomal dominant genetic trait hereditary alpha-tryptasemia is the most often cause for elevated BST levels, with other acquired causes, such as renal failure and clonal myeloid diseases being far less common. Acute increases in serum tryptase levels resulting from release of mature tryptase from secretory granules is specific to mast cell degranulation but is not detected in all cases of systemic anaphylaxis. CONCLUSION Understanding the differences and distinguishing between acute increases in serum tryptase and chronic elevations in BST owing to inherited or acquired conditions is critical in the correct interpretation of this useful clinical biomarker.
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Affiliation(s)
- Jonathan J Lyons
- Translational Allergic Immunopathology Unit, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland.
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13
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Wu R, Lyons JJ. Hereditary Alpha-Tryptasemia: a Commonly Inherited Modifier of Anaphylaxis. Curr Allergy Asthma Rep 2021; 21:33. [PMID: 33970354 DOI: 10.1007/s11882-021-01010-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE OF REVIEW Hereditary alpha-tryptasemia (HαT) is an autosomal dominant genetic trait and a common cause of elevated basal serum tryptase in Western populations. It is a risk factor for severe anaphylaxis among individuals with venom allergy and an established modifier of anaphylaxis and mast cell mediator-associated symptoms among patients with systemic mastocytosis. Understanding the physiology of tryptases and how this may relate to the clinical features associated with HαT is the first step in identifying optimal medical management and targets for novel therapeutics. RECENT FINDINGS HαT prevalence is increased in both clonal and non-clonal mast cell-associated disorders where it augments symptoms of immediate hypersensitivity, including anaphylaxis. The unique properties of naturally occurring α/β-tryptase heterotetramers may explain certain elements of phenotypes associated with HαT, though additional mechanisms are being evaluated. This review provides an overview of the clinical and translational studies that have identified HαT as a modifier of mast cell-associated disorders and anaphylaxis and discusses mechanisms that may potentially explain some of these clinical findings.
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Affiliation(s)
- Richard Wu
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Building 29B, Room 5NN18, MSC 1889, Bethesda, MD, 20892, USA
| | - Jonathan J Lyons
- Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Building 29B, Room 5NN18, MSC 1889, Bethesda, MD, 20892, USA.
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14
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Heldring N, Kahn L, Zilg B. Fatal anaphylactic shock: A review of postmortem biomarkers and diagnostics. Forensic Sci Int 2021; 323:110814. [PMID: 33951572 DOI: 10.1016/j.forsciint.2021.110814] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 04/22/2021] [Accepted: 04/23/2021] [Indexed: 12/21/2022]
Abstract
Diagnosing anaphylactic shock postmortem is challenging since differential diagnoses exist and the forensic pathologist often faces subtle findings and lacks relevant information which prevents reaching an opinion of certainty. This review provides an overview of the literature covering research and existing recommendations on the postmortem diagnosis of anaphylactic shock. In order to harmonize the approach and provide guidance for diagnosing deaths from anaphylactic shock in the six forensic centers in Sweden, a guidance protocol aligned with the notion of a holistic view in the approach was devised. Areas in need of further studies include both immunohistological and biochemical investigations to stratify quantitative approaches based on condition and anaphylactic trigger and to lay the ground for and possibly establish alternative matrices.
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Affiliation(s)
- Nina Heldring
- Department of Forensic Medicine, Swedish National Board of Forensic Medicine, Retzius väg 5, SE-171 65 Stockholm, Sweden; Karolinska Institutet, Solnavägen 1, SE-171 77 Solna, Sweden.
| | - Lydia Kahn
- Department of Forensic Medicine, Swedish National Board of Forensic Medicine, Retzius väg 5, SE-171 65 Stockholm, Sweden; Karolinska Institutet, Solnavägen 1, SE-171 77 Solna, Sweden
| | - Brita Zilg
- Department of Forensic Medicine, Swedish National Board of Forensic Medicine, Retzius väg 5, SE-171 65 Stockholm, Sweden; Karolinska Institutet, Solnavägen 1, SE-171 77 Solna, Sweden
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15
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Post mortem tryptase: A review of literature on its use, sampling and interpretation in the investigation of fatal anaphylaxis. Forensic Sci Int 2020; 314:110415. [PMID: 32717658 DOI: 10.1016/j.forsciint.2020.110415] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Revised: 06/20/2020] [Accepted: 07/13/2020] [Indexed: 12/18/2022]
Abstract
Post mortem tryptase is a commonly-used ancillary test in the investigation of possible anaphylactic deaths. Ante mortem tryptase interpretation differs from post mortem interpretation due to differing priorities, biochemical behaviours and capacity for follow-up. Additionally, post mortem tryptase sampling site, method and even cut-off levels are not standardised between facilities. This review of the literature investigates the existing research and recommendations on the use of post mortem tryptase in suspected anaphylactic deaths. Currently, autopsy recommendations suggest early sampling, standardised sampling technique with clamping of and aspiration from the femoral vein, and for the results to be interpreted within the wider autopsy and clinical context. Areas in need of further research include the effects of cytolysis on tryptase levels and studies to stratify differing tryptase levels based on type of death and anaphylactic trigger.
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16
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Passia E, Jandus P. Using Baseline and Peak Serum Tryptase Levels to Diagnose Anaphylaxis: a Review. Clin Rev Allergy Immunol 2020; 58:366-376. [PMID: 32034676 DOI: 10.1007/s12016-020-08777-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The diagnosis of anaphylaxis relies on a suggestive clinical history after exposure to a potential triggering factor. Serum tryptase concentrations increase on degranulation of mast cells and therefore serum tryptase levels are measured to diagnose anaphylaxis. There is no standardized method for assessing total serum mast cell tryptase (MCT) in anaphylaxis. The Working Conference in 2010 proposed a consensus equation (peak MCT should be > 1.2x baseline tryptase + 2 ng/L) to diagnose acute mast cell activation (aMCA). Our objective was to narratively review the literature since the Working Conference in 2010, examining the use of the consensus equation and other equations comparing baseline and peak serum tryptase during anaphylaxis. Computerized bibliographic searches of PUBMED and EMBASE were supplemented with a manual search of reference lists. English-language studies were included. Eleven studies met our inclusion criteria with a total of 4551 participants. However, only four studies with 653 participants used the consensus equation. The other seven studies used other methods to compare peak and baseline serum tryptase concentrations. Measuring serum tryptase levels is valuable in the diagnosis of anaphylaxis but is unable to detect all anaphylactic reactions. Based on our current literature review, the consensus equation is underused in the diagnosis of anaphylaxis. There is also a need for exploration of other biomarkers which could be used in parallel to peak and baseline serum tryptase measurements for further diagnostic certainty. Serum tryptase is the most studied biomarker in anaphylaxis but is still far from being the ideal biomarker for this. There is a need to identify new potential useful biomarkers. Serum tryptase levels are valuable in the diagnosis of anaphylaxis, but are unable to detect all anaphylactic reactions. Additionally serial tryptase measurements are laborious in daily clinical practice.
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Affiliation(s)
| | - Peter Jandus
- Department of Medicine, Division of Immunology and Allergy, University Hospital and Medical Faculty, Geneva, Switzerland.
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17
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Diagnostic Challenges in Anaphylaxis. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2020; 8:1177-1184. [DOI: 10.1016/j.jaip.2019.11.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 12/18/2022]
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Abstract
Immediate administration of intramuscular epinephrine to a patient experiencing anaphylaxis is the first-line therapy for this life-threatening allergic reaction. Alhough anaphylaxis is generally a rare occurrence, it has dire consequences if left untreated. In infants, anaphylaxis is typically triggered by exposure to egg, cow's milk, or peanuts. The rapid onset of symptoms in multiple organ systems makes an accurate diagnosis in infants difficult because there are numerous ways in which anaphylaxis may present. The symptoms of infant anaphylaxis are often underrecognized or misdiagnosed for less serious illnesses or even normal findings, including drooling, loose stools, and irritability. Because infants are mostly nonverbal-and most pediatric emergency department visits for anaphylaxis cases are the first diagnosis-ascertaining potential exposure to common allergens is difficult; this further complicates diagnosis in these youngest patients for whom the clinical presentation of anaphylaxis varies widely. A key factor in diagnosing anaphylaxis is the temporal profile of symptom development following allergen exposure; however, some children with anaphylaxis develop symptoms that reoccur hours or days after an initial anaphylactic reaction, making diagnosis challenging. Advanced practice nurses are often the first health care provider to encounter a patient who may be experiencing anaphylaxis. Although diagnostic criteria exist for anaphylaxis, specific criteria for the diagnosis of anaphylaxis in infants have not been developed. As such, it is important to understand and recognize the variable presentation of anaphylaxis in infants and to rapidly diagnose and treat with epinephrine.
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19
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Mast cell activation in the context of elevated basal serum tryptase: genetics and presentations. Curr Allergy Asthma Rep 2019; 19:55. [PMID: 31776770 DOI: 10.1007/s11882-019-0887-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
PURPOSE OF REVIEW To describe inherited and acquired genetic variants and clinical entities associated with increased basal serum tryptase (BST), distinguish these levels from those which acutely rise due to mast cell activation, and finally to characterize the association between chronically elevated basal serum tryptase and episodic mast cell activation. RECENT FINDINGS Hereditary alpha-tryptasemia is a commonly inherited genetic cause for basally elevated serum tryptase and explains elevated BST in many individuals who do not have evidence of clonal myeloid or mast cell disease. When clonal myeloid disease is present, BST may be elevated and can be a biomarker of a number of disparate disorders of the myeloid compartment. Elevated BST is most commonly caused by hereditary alpha tryptasemia but may also be indicative of clonal myeloid disease. Clinical reports suggest that elevated BST is associated with increased risk for more severe systemic allergic reactions to a number of eliciting agents and exposures. Additional studies are needed to determine the role that inherited or acquired genetic variants associated with elevated BST and clonal or non-clonal myeloid diseases may play in these reactions.
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20
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Valent P, Bonadonna P, Hartmann K, Broesby-Olsen S, Brockow K, Butterfield JH, Triggiani M, Lyons JJ, Oude Elberink JNG, Arock M, Metcalfe DD, Akin C. Why the 20% + 2 Tryptase Formula Is a Diagnostic Gold Standard for Severe Systemic Mast Cell Activation and Mast Cell Activation Syndrome. Int Arch Allergy Immunol 2019; 180:44-51. [PMID: 31256161 DOI: 10.1159/000501079] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Accepted: 05/20/2019] [Indexed: 12/16/2022] Open
Abstract
Mast cell activation syndrome (MCAS) is a condition characterized by recurrent episodes of clinically relevant, systemic, severe reactions to mast cell (MC)-derived mediators released in the context of anaphylaxis or another acute MC-related event. It is important to document MC involvement in these reactions in order to establish the diagnosis MCAS. The most specific and reliable marker of systemic MC activation is an acute and substantial event-related (transient) increase in the serum tryptase level over the individual's baseline value. However, the baseline level of tryptase varies depending on the underlying disease and the genetic background. For example, an estimated 3-5% of healthy individuals exhibit duplications or multiple copies of the TPSAB1 gene encoding for alpha-tryptase, and over 30% of all patients with myeloid neoplasms, including mastocytosis, have elevated basal tryptase levels. Therefore, it is of utmost importance to adjust the event-related diagnostic (MCAS-confirming) increase in tryptase over the individual baseline in a robust approach. To address this challenge, the 20% + 2 formula was proposed by the consensus group in 2012. Since then, this approach has been validated in clinical practice by independent groups and found to be sound. In the current article, we discuss the emerging importance and value of the 20% + 2 formula in clinical practice and its role as a criterion of severe systemic MC activation and MCAS.
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Affiliation(s)
- Peter Valent
- Department of Internal Medicine I, Division of Hematology and Hemostaseology, and Ludwig Boltzmann Institute for Hematology and Oncology, Medical University of Vienna, Vienna, Austria,
| | | | - Karin Hartmann
- Division of Allergy, Department of Dermatology, University of Basel, Basel, Switzerland
| | - Sigurd Broesby-Olsen
- Department of Dermatology and Allergy Centre, Odense University Hospital, Odense, Denmark
| | - Knut Brockow
- Department of Dermatology and Allergy Biederstein, Technical University of Munich, Munich, Germany
| | | | - Massimo Triggiani
- Division of Allergy and Clinical Immunology, University of Salerno, Salerno, Italy
| | - Jonathan J Lyons
- Laboratory of Allergic Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Joanna N G Oude Elberink
- Department of Allergology, University Medical Center of Groningen, University of Groningen, Groningen, The Netherlands
| | - Michel Arock
- Department of Hematological Biology, Pitié-Salpêtrière Hospital, Pierre et Marie Curie University (UPMC), Paris, France
| | - Dean D Metcalfe
- Laboratory of Allergic Diseases, NIAID, NIH, Bethesda, Maryland, USA
| | - Cem Akin
- Division of Allergy and Clinical Immunology, University of Michigan, Ann Arbor, Michigan, USA
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21
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Szari S, Wong PH, Crisp HC, Champoux E, Rans TS, Coop CA. Evaluation of tryptase after subcutaneous immunotherapy-associated systemic reactions. Ann Allergy Asthma Immunol 2019; 122:413-415.e1. [PMID: 30684737 DOI: 10.1016/j.anai.2019.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 01/08/2019] [Accepted: 01/10/2019] [Indexed: 10/27/2022]
Affiliation(s)
- Sofia Szari
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas.
| | - Priscilla H Wong
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas
| | - Howard C Crisp
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas
| | - Edward Champoux
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas
| | - Tonya S Rans
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas
| | - Christopher A Coop
- Allergy/Immunology Clinic, Wilford Hall Medical Center, Lackland AFB, Texas
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22
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Dua S, Dowey J, Foley L, Islam S, King Y, Ewan P, Clark AT. Diagnostic Value of Tryptase in Food Allergic Reactions: A Prospective Study of 160 Adult Peanut Challenges. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2018; 6:1692-1698.e1. [DOI: 10.1016/j.jaip.2018.01.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2017] [Revised: 12/28/2017] [Accepted: 01/03/2018] [Indexed: 10/17/2022]
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23
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Buka RJ, Knibb RC, Crossman RJ, Melchior CL, Huissoon AP, Hackett S, Dorrian S, Cooke MW, Krishna MT. Anaphylaxis and Clinical Utility of Real-World Measurement of Acute Serum Tryptase in UK Emergency Departments. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2018; 5:1280-1287.e2. [PMID: 28888252 DOI: 10.1016/j.jaip.2017.06.021] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 05/27/2017] [Accepted: 06/22/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND British guidelines recommend that serial acute serum tryptase measurements be checked in all adults and a subset of children presenting with anaphylaxis. This is the first study reporting the clinical utility of acute serum tryptase in a "real-world" emergency department (ED) setting following the publication of the World Allergy Organization (WAO) criteria for anaphylaxis. OBJECTIVES To (1) assess sensitivity, specificity, and positive and negative predictive values (PPV, NPV) of acute serum tryptase in anaphylaxis; (b) determine factors associated with higher acute serum tryptase levels; and (c) audit compliance of acute serum tryptase measurement in the ED. METHODS The methods used were retrospective electronic search for ED admissions to 3 acute care hospitals in Birmingham, UK, with anaphylaxis in 2012 using wide search terms followed by scrutiny of electronic clinical records and application of the WAO diagnostic criteria for anaphylaxis. Patients with an acute serum tryptase measurement were included in the analysis. RESULTS Acute serum tryptase level was measured in 141 of 426 (33.1%) cases. Mean time from the onset of symptoms to the measurement of acute serum tryptase level was 4 hours 42 minutes (SD ± 05:03 hours) and no patients had serial measurements conforming to British guidelines. Acute serum tryptase level of more than 12.4 ng/mL (75th centile) was associated with a sensitivity, specificity, PPV, and NPV of 28%, 88%, 0.93, and 0.17, respectively. Multiple regression analysis showed that male sex (odds ratio, 2.66; P = .003) and hypotension (odds ratio, 7.08; P = .001) predicted higher acute serum tryptase level. CONCLUSIONS An acute serum tryptase level of more than 12.4 ng/mL in an ED setting carries high PPV and specificity, but poor sensitivity and NPV.
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Affiliation(s)
- Richard J Buka
- Department of Allergy and Immunology, Heart of England NHS Foundation Trust, Birmingham, United Kingdom; Institute of Inflammation & Ageing, University of Birmingham, Birmingham, United Kingdom.
| | - Rebecca C Knibb
- Department of Psychology, Aston University, Birmingham, United Kingdom
| | | | - Cathryn L Melchior
- Department of Allergy and Immunology, Heart of England NHS Foundation Trust, Birmingham, United Kingdom
| | - Aarnoud P Huissoon
- Department of Allergy and Immunology, Heart of England NHS Foundation Trust, Birmingham, United Kingdom
| | - Scott Hackett
- Department of Pediatric Allergy, Immunology and Infectious Diseases, Heart of England NHS Foundation Trust, Birmingham, United Kingdom
| | - Susan Dorrian
- Department of Emergency Medicine, Heart of England NHS Foundation Trust, Birmingham, United Kingdom
| | - Matthew W Cooke
- Department of Emergency Medicine, Heart of England NHS Foundation Trust, Birmingham, United Kingdom
| | - Mamidipudi T Krishna
- Department of Allergy and Immunology, Heart of England NHS Foundation Trust, Birmingham, United Kingdom; Institute of Immunology & Immunotherapy, University of Birmingham, Birmingham, United Kingdom
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Wong JT, Long A. Rituximab Hypersensitivity: Evaluation, Desensitization, and Potential Mechanisms. THE JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY-IN PRACTICE 2017; 5:1564-1571. [DOI: 10.1016/j.jaip.2017.08.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 08/11/2017] [Accepted: 08/14/2017] [Indexed: 01/24/2023]
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25
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Benedé S, Garrido-Arandia M, Martín-Pedraza L, Bueno C, Díaz-Perales A, Villalba M. Multifactorial Modulation of Food-Induced Anaphylaxis. Front Immunol 2017; 8:552. [PMID: 28559894 PMCID: PMC5432630 DOI: 10.3389/fimmu.2017.00552] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 04/25/2017] [Indexed: 01/26/2023] Open
Abstract
Prevalence of food-induced anaphylaxis increases progressively and occurs in an unpredictable manner, seriously affecting the quality of life of patients. Intrinsic factors including age, physiological, and genetic features of the patient as well as extrinsic factors such as the intake of drugs and exposure to environmental agents modulate this disorder. It has been proven that diseases, such as mastocytosis, defects in HLA, or filaggrin genes, increase the risk of severe allergic episodes. Certain allergen families such as storage proteins, lipid transfer proteins, or parvalbumins have also been linked to anaphylaxis. Environmental factors such as inhaled allergens or sensitization through the skin can exacerbate or trigger acute anaphylaxis. Moreover, the effect of dietary habits such as the early introduction of certain foods in the diet, and the advantage of the breastfeeding remain as yet unresolved. Interaction of allergens with the intestinal cell barrier together with a set of effector cells represents the primary pathways of food-induced anaphylaxis. After an antigen cross-links the IgEs on the membrane of effector cells, a complex intracellular signaling cascade is initiated, which leads cells to release preformed mediators stored in their granules that are responsible for the acute symptoms of anaphylaxis. Afterward, they can also rapidly synthesize lipid compounds such as prostaglandins or leukotrienes. Cytokines or chemokines are also released, leading to the recruitment and activation of immune cells in the inflammatory microenvironment. Multiple factors that affect food-induced anaphylaxis are discussed in this review, paying special attention to dietary habits and environmental and genetic conditions.
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Affiliation(s)
- Sara Benedé
- Dpto. Bioquímica y Biología Molecular I, Universidad Complutense de Madrid, Madrid, Spain
| | - María Garrido-Arandia
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Pozuelo de Alarcón, Madrid, Spain
| | - Laura Martín-Pedraza
- Dpto. Bioquímica y Biología Molecular I, Universidad Complutense de Madrid, Madrid, Spain
| | - Cristina Bueno
- Dpto. Bioquímica y Biología Molecular I, Universidad Complutense de Madrid, Madrid, Spain
| | - Araceli Díaz-Perales
- Centro de Biotecnología y Genómica de Plantas (UPM-INIA), Campus de Montegancedo, Pozuelo de Alarcón, Madrid, Spain
| | - Mayte Villalba
- Dpto. Bioquímica y Biología Molecular I, Universidad Complutense de Madrid, Madrid, Spain
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Egner W, Sargur R, Shrimpton A, York M, Green K. A 17-year experience in perioperative anaphylaxis 1998-2015: harmonizing optimal detection of mast cell mediator release. Clin Exp Allergy 2016; 46:1465-1473. [DOI: 10.1111/cea.12785] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Revised: 05/24/2016] [Accepted: 07/20/2016] [Indexed: 12/20/2022]
Affiliation(s)
- W. Egner
- Clinical Immunology and Allergy Unit and Department of Immunology and Protein Reference Unit; Sheffield Teaching Hospitals NHS Trust; Sheffield UK
| | - R. Sargur
- Clinical Immunology and Allergy Unit and Department of Immunology and Protein Reference Unit; Sheffield Teaching Hospitals NHS Trust; Sheffield UK
| | - A. Shrimpton
- Clinical Immunology and Allergy Unit and Department of Immunology and Protein Reference Unit; Sheffield Teaching Hospitals NHS Trust; Sheffield UK
| | - M. York
- Clinical Immunology and Allergy Unit and Department of Immunology and Protein Reference Unit; Sheffield Teaching Hospitals NHS Trust; Sheffield UK
| | - K. Green
- Clinical Immunology and Allergy Unit and Department of Immunology and Protein Reference Unit; Sheffield Teaching Hospitals NHS Trust; Sheffield UK
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27
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Badellino H, Jares E. Advances in Food-Induced Anaphylaxis. CURRENT TREATMENT OPTIONS IN ALLERGY 2016. [DOI: 10.1007/s40521-016-0093-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Tryptase levels in children presenting with anaphylaxis: Temporal trends and associated factors. J Allergy Clin Immunol 2016; 137:1138-1142. [DOI: 10.1016/j.jaci.2015.09.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 08/11/2015] [Accepted: 09/03/2015] [Indexed: 01/13/2023]
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29
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Lomas JM, Järvinen KM. Managing nut-induced anaphylaxis: challenges and solutions. J Asthma Allergy 2015; 8:115-23. [PMID: 26604803 PMCID: PMC4631427 DOI: 10.2147/jaa.s89121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The prevalence of peanut and tree nut allergy in the USA has increased, especially in the pediatric population. Nut allergy remains the leading cause of fatal anaphylactic reactions. Management of anaphylaxis includes not only treatment of symptoms during a reaction, but strict dietary avoidance and education on potential situations, which may place the patient at high risk for accidental exposure. Cross-reactivity between various nuts along with various cross-contamination sources should be discussed with all nut-allergic individuals. Exciting research continues to emerge on other potential treatments for patients allergic to nuts, including allergen immunotherapy. Results of such interventions have been encouraging, though further studies are needed regarding safety and long-term outcomes before these can be applied to clinical practice.
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Affiliation(s)
- Jeanne M Lomas
- Division of Pediatric Allergy and Immunology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Kirsi M Järvinen
- Division of Pediatric Allergy and Immunology, University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
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30
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Simons FER, Ebisawa M, Sanchez-Borges M, Thong BY, Worm M, Tanno LK, Lockey RF, El-Gamal YM, Brown SG, Park HS, Sheikh A. 2015 update of the evidence base: World Allergy Organization anaphylaxis guidelines. World Allergy Organ J 2015; 8:32. [PMID: 26525001 PMCID: PMC4625730 DOI: 10.1186/s40413-015-0080-1] [Citation(s) in RCA: 322] [Impact Index Per Article: 35.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 09/25/2015] [Indexed: 11/10/2022] Open
Abstract
The World Allergy Organization (WAO) Guidelines for the assessment and management of anaphylaxis provide a unique global perspective on this increasingly common, potentially life-threatening disease. Recommendations made in the original WAO Anaphylaxis Guidelines remain clinically valid and relevant, and are a widely accessed and frequently cited resource. In this 2015 update of the evidence supporting recommendations in the Guidelines, new information based on anaphylaxis publications from January 2014 through mid- 2015 is summarized. Advances in epidemiology, diagnosis, and management in healthcare and community settings are highlighted. Additionally, new information about patient factors that increase the risk of severe and/or fatal anaphylaxis and patient co-factors that amplify anaphylactic episodes is presented and new information about anaphylaxis triggers and confirmation of triggers to facilitate specific trigger avoidance and immunomodulation is reviewed. The update includes tables summarizing important advances in anaphylaxis research.
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Affiliation(s)
- F Estelle R Simons
- Department of Pediatrics & Child Health and Department of Immunology, College of Medicine, Faculty of Health Sciences, The University of Manitoba, Room FE125, 820 Sherbrook Street, Winnipeg, R3A 1R9 MB Canada
| | - Motohiro Ebisawa
- Department of Allergy, Clinical Research Center for Allergy & Rheumatology, Sagamihara National Hospital, Sagamihara, Kanagawa Japan
| | - Mario Sanchez-Borges
- Allergy and Clinical Immunology Department, Centro Medico-Docente La Trinidad, Caracas, Venezuela
| | - Bernard Y Thong
- Department of Rheumatology, Allergy & Immunology, Tan Tock Seng Hospital, Singapore, Singapore
| | - Margitta Worm
- Allergie-Centrum-Charite, Klinik fur Dermatologie, Venerologie und Allergologie, Campus Charite Mitte, Universitatsmedizin, Berlin, Germany
| | - Luciana Kase Tanno
- Department of Allergy and Clinical Immunology, Hospital Servidor Publico Estadual de Sao Paulo and Hospital Sirio-Libanes, Sao Paulo, Brazil
| | | | - Yehia M El-Gamal
- Pediatric Allergy and Immunology Unit, Children's Hospital, Ain Shams University, Cairo, Egypt
| | - Simon Ga Brown
- Royal Hobart Hospital, Tasmania, and University of Western Australia and Royal Perth Hospital, Perth, Western Australia
| | - Hae-Sim Park
- Department of Allergy & Clinical Immunology, Ajou University School of Medicine, Seoul, South Korea
| | - Aziz Sheikh
- Allergy & Respiratory Research Group, Usher Institute of Population Health Sciences and Informatics, The University of Edinburgh, Edinburgh, UK
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Tsoumani M, Sharma V, Papadopoulos NG. Food-Induced Anaphylaxis Year in Review. CURRENT TREATMENT OPTIONS IN ALLERGY 2015. [DOI: 10.1007/s40521-015-0054-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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