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PubMed This is a summary of 16 peer-reviewed journal articles Updated
Allergy

Building Your Care Team and Navigating the ER

At a Glance

When visiting the ER for Hereditary Angioedema (HAE), you must bring your own rescue medications, as most hospitals do not stock them. Carry a formal Emergency Action Plan from your specialist stating that standard allergy treatments will not work for HAE swelling.

Managing Hereditary Angioedema (HAE) is not a solo effort. Because the condition is rare and complex, you need a specialized medical team that understands the latest science and an ironclad plan for navigating the emergency room (ER) [1][2].

Building Your Expert Care Team

The cornerstone of HAE management is an Allergist or Immunologist who has specific experience with bradykinin-mediated swelling [2][3]. Because the treatment landscape is moving so fast—with new oral drugs and gene-targeting therapies—your doctor must be someone who stays current with the latest international guidelines [4][5].

A comprehensive care team may also include:

  • Specialized HAE Centers: If possible, establish care at a center of excellence to coordinate complex needs like pregnancy care or surgical planning [2][1].
  • Nurses and Educators: These professionals are essential for training you on self-administration, which is the gold standard for maintaining independence and quality of life [6][7].

Navigating the ER: The Crucial Reality

Many ER physicians have never seen a case of HAE. Without guidance, they may treat you for a standard allergy or assume your abdominal pain is a surgical emergency [8][9]. To prevent dangerous delays, you must understand one fundamental rule:

Most local emergency rooms DO NOT stock HAE-specific rescue medications.
If you go to the ER assuming they will have icatibant or C1-inhibitors on hand, you may be left vulnerable during a life-threatening airway attack. You must physically bring your own rescue medications with you to the ER and advocate for the medical staff to administer them (or allow you to self-administer) [10][11].

If you absolutely do not have your medication, you must inform the ER doctors that Fresh Frozen Plasma (FFP) can sometimes be used as a last-resort backup treatment to provide C1-inhibitor enzymes, though it is secondary to targeted therapies [12].

The Emergency Action Plan

You must carry a formal Emergency Action Plan [10]. Your Action Plan should be a signed letter from your specialist that states:

  1. The Diagnosis: Explicitly name “Hereditary Angioedema” and your specific type.
  2. What NOT to Give: State clearly that epinephrine, antihistamines, and steroids will not work [13][14].
  3. The Required Treatment: List your specific rescue medications and correct dosages [15].
  4. Specialist Contact Info: Provide a 24/7 phone number for your HAE expert so the ER doctor can consult them directly [1].

Your Essential “Go-Bag”

An HAE patient should never be without their “tools.” Always carry:

  • Two Doses of Rescue Therapy: Attacks can “rebound,” so having a second dose is critical [10].
  • Medical Alert Identification: A bracelet listing “Hereditary Angioedema” and “No Hives” [16].
  • The Physical Action Plan: Keep a laminated copy in your bag and a digital copy on your phone.

Return to Home Page

Common questions in this guide

Why do I need to bring my own HAE medications to the emergency room?
Most local emergency rooms do not stock HAE-specific rescue medications like icatibant or C1-inhibitors. Bringing your own ensures you are not left vulnerable to dangerous delays during a life-threatening attack.
Will standard allergy medications stop an HAE attack?
No, standard allergy treatments like epinephrine, antihistamines, and steroids will not work for a hereditary angioedema attack. HAE requires specific targeted therapies to stop bradykinin-mediated swelling.
What should I include in my HAE emergency action plan?
Your plan should be a signed letter from your specialist stating your diagnosis, warning the ER not to use standard allergy medications, listing your specific rescue medications and dosages, and providing a 24/7 contact number for your doctor.
What kind of doctor should manage my HAE?
The cornerstone of your care team should be an allergist or immunologist who specializes in bradykinin-mediated swelling. They should stay current with the latest international guidelines for HAE management.
What is the backup treatment in the ER if I don't have my HAE medication?
If specialized medications are absolutely unavailable, Fresh Frozen Plasma (FFP) can sometimes be used as a last-resort backup in the ER. It provides the necessary C1-inhibitor enzymes to help manage the attack.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.How many patients with HAE do you currently manage in your practice?
  2. 2.Are you familiar with the most recent WAO/EAACI guidelines for HAE management?
  3. 3.Can we create and sign a formal Emergency Action Plan that I can keep on my phone and in my wallet?
  4. 4.Does your office have a 24/7 on-call specialist who can speak directly to ER physicians if I have a severe attack?
  5. 5.Which HAE-specific patient advocacy groups do you recommend I join for additional support?
  6. 6.If I require a procedure, what is your protocol for coordinating with my surgeon or dentist for short-term prophylaxis?

Questions For You

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References

References (16)
  1. 1

    [Hereditary angioedema due to C1-inhibitor deficiency, a national disease management programme].

    Aberer W, Altrichter S, Cerpes U, et al.

    Wiener klinische Wochenschrift 2023; (135(Suppl 8)):785-798 doi:10.1007/s00508-023-02298-x.

    PMID: 38063938
  2. 2

    Comprehensive care for hereditary angioedema: lessons learned from HAEmophilia Treatment Centers.

    Uminski K, Goodyear D

    Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology 2026; (22(1)).

    PMID: 42129879
  3. 3

    The multifactorial impact of receiving a hereditary angioedema diagnosis.

    Raasch J, Glaum MC, O'Connor M

    The World Allergy Organization journal 2023; (16(6)):100792 doi:10.1016/j.waojou.2023.100792.

    PMID: 37448849
  4. 4

    The international WAO/EAACI guideline for the management of hereditary angioedema - The 2021 revision and update.

    Maurer M, Magerl M, Betschel S, et al.

    The World Allergy Organization journal 2022; (15(3)):100627 doi:10.1016/j.waojou.2022.100627.

    PMID: 35497649
  5. 5

    Current and Emerging Therapeutics in Hereditary Angioedema.

    Do T, Riedl MA

    Immunology and allergy clinics of North America 2024; (44(3)):561-576 doi:10.1016/j.iac.2024.03.009.

    PMID: 38937016
  6. 6

    Hereditary angioedema: an update on causes, manifestations and treatment.

    Longhurst HJ, Bork K

    British journal of hospital medicine (London, England : 2005) 2019; (80(7)):391-398 doi:10.12968/hmed.2019.80.7.391.

    PMID: 31283393
  7. 7

    Training patients for self-administration of a new subcutaneous C1-inhibitor concentrate for hereditary angioedema.

    Murphy E, Donahue C, Omert L, et al.

    Nursing open 2019; (6(1)):126-135 doi:10.1002/nop2.194.

    PMID: 30534402
  8. 8

    Impact of providing education on the recognition and differential diagnosis of angioedema among emergency department physicians.

    Unal D, Demir S, Işik SR, et al.

    The World Allergy Organization journal 2025; (18(8)):101101 doi:10.1016/j.waojou.2025.101101.

    PMID: 40822745
  9. 9

    Misdiagnosis trends in patients with hereditary angioedema from the real-world clinical setting.

    Zanichelli A, Longhurst HJ, Maurer M, et al.

    Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology 2016; (117(4)):394-398 doi:10.1016/j.anai.2016.08.014.

    PMID: 27742086
  10. 10

    Breakthrough attacks in patients with hereditary angioedema receiving long-term prophylaxis are responsive to icatibant: findings from the Icatibant Outcome Survey.

    Aberer W, Maurer M, Bouillet L, et al.

    Allergy, asthma, and clinical immunology : official journal of the Canadian Society of Allergy and Clinical Immunology 2017; (13()):31 doi:10.1186/s13223-017-0203-z.

    PMID: 28690642
  11. 11

    HEREDITARY ANGIOEDEMA DUE TO C1-INHIBITOR DEFICIENCY IN PEDIATRIC PATIENTS IN CROATIA - FIRST NATIONAL STUDY, DIAGNOSTIC AND PROPHYLACTIC CHALLENGES.

    Karadža-Lapić L, Barešić M, Vrsalović R, et al.

    Acta clinica Croatica 2019; (58(1)):139-146 doi:10.20471/acc.2019.58.01.18.

    PMID: 31363336
  12. 12

    Short-term prophylaxis for children and adolescents with hereditary angioedema.

    Ajewole O, Lanlokun M, Dimanche S, Craig T

    Allergy and asthma proceedings 2021; (42(3)):205-213 doi:10.2500/aap.2021.42.210006.

    PMID: 33980333
  13. 13

    Hereditary angioedema: Pathophysiology (HAE type I, HAE type II, and HAE nC1-INH).

    Wedner HJ

    Allergy and asthma proceedings 2020; (41(Suppl 1)):S14-S17 doi:10.2500/aap.2020.41.200081.

    PMID: 33109319
  14. 14

    Hereditary angioedema: current therapeutic management and future approaches.

    Lamacchia D, Nappi E, Marzio V, et al.

    Current opinion in allergy and clinical immunology 2024; (24(4)):257-265 doi:10.1097/ACI.0000000000000992.

    PMID: 38743499
  15. 15

    Management of hereditary angioedema in resource-constrained settings: A consensus statement from Indian subcontinent.

    Jindal AK, Sil A, Aggarwal R, et al.

    Asia Pacific allergy 2023; (13(2)):60-65 doi:10.5415/apallergy.0000000000000100.

    PMID: 37388810
  16. 16

    Case Report: Early presentation of hereditary angioedema symptoms in a 2-year-old boy.

    Staikuniene-Kozonis J, Staikunaite J, Gasiuniene E, Sematonyte J

    Frontiers in pediatrics 2024; (12()):1408110 doi:10.3389/fped.2024.1408110.

    PMID: 38978843

This page provides general guidance on navigating emergencies with Hereditary Angioedema. It is for educational purposes only and does not replace a personalized emergency action plan developed with your specialist.

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