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Angioedema Therapy – Treatment and Emergency Care

Angioedema therapy covers all treatments for angioedema – a sudden, deep swelling of the skin and mucous membranes. Depending on the underlying cause, different medications and emergency measures are used.

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Things worth knowing about "Angioedema Therapy"

Angioedema therapy covers all treatments for angioedema – a sudden, deep swelling of the skin and mucous membranes. Depending on the underlying cause, different medications and emergency measures are used.

What Is Angioedema?

Angioedema is a rapid, deep swelling of the skin and mucous membranes, most commonly affecting the face, lips, tongue, throat, larynx, extremities, and abdomen. Unlike urticaria (hives), which involves the surface layers of the skin, angioedema affects deeper tissue layers. Involvement of the upper airways can be life-threatening and requires immediate medical intervention.

Causes and Types of Angioedema

The treatment of angioedema depends critically on its underlying cause. The main types include:

Allergic angioedema: Triggered by allergic reactions to foods, insect stings, medications, or other allergens. Often accompanied by urticaria and anaphylaxis.
Hereditary angioedema (HAE): A rare genetic disorder caused by a deficiency or dysfunction of the C1-esterase inhibitor (C1-INH), leading to uncontrolled bradykinin release and recurrent swelling episodes.
ACE inhibitor-induced angioedema: A known side effect of ACE inhibitors (e.g., ramipril, lisinopril), caused by accumulation of bradykinin. Can occur months or even years after starting therapy.
Idiopathic angioedema: Angioedema with no identifiable cause; further diagnostic workup is needed in recurrent cases.

Treatment of Allergic Angioedema

Allergic angioedema is mediated by histamine and other mast cell-derived mediators. Treatment is guided by the severity of the reaction:

Antihistamines (e.g., cetirizine, loratadine, clemastine): Counter histamine-mediated swelling and itching. Used in mild to moderate reactions.
Corticosteroids (e.g., prednisolone, dexamethasone): Suppress the inflammatory response and reduce swelling. Administered systemically (orally or intravenously).
Adrenaline (epinephrine): The first-line treatment in severe anaphylactic reactions with angioedema. Administered intramuscularly (preferably into the outer thigh) using an auto-injector (e.g., EpiPen). Acts as a bronchodilator and vasoconstrictor to prevent life-threatening airway obstruction.

Treatment of Hereditary Angioedema (HAE)

HAE does not respond to antihistamines or corticosteroids because it is bradykinin-mediated, not histamine-mediated. Treatment options include:

Acute Attack Treatment

C1-esterase inhibitor concentrate (C1-INH) (e.g., Berinert, Ruconest): Replaces the deficient or dysfunctional C1-INH and stops uncontrolled bradykinin production. Administered intravenously.
Icatibant (Firazyr): A selective bradykinin B2 receptor antagonist that blocks the action of bradykinin at its receptor. Administered subcutaneously and can be self-injected by the patient.
Ecallantide (Kalbitor): A plasma kallikrein inhibitor that reduces bradykinin production. Primarily approved in the United States.

Long-term Prophylaxis

C1-INH concentrate for prophylaxis: Regular intravenous or subcutaneous administration to prevent attacks.
Lanadelumab (Takhzyro): A monoclonal antibody that inhibits plasma kallikrein. Administered subcutaneously every two to four weeks and significantly reduces attack frequency.
Berotralstat (Orladeyo): An oral plasma kallikrein inhibitor taken daily, offering a convenient prophylactic option.
Tranexamic acid and danazol: Older prophylactic agents, now less commonly used due to a less favorable side effect profile.

Treatment of ACE Inhibitor-Induced Angioedema

ACE inhibitor-induced angioedema is also bradykinin-mediated. The most important step is immediate discontinuation of the causative ACE inhibitor. Antihistamines and corticosteroids are generally ineffective. In severe cases, icatibant may be used as an off-label treatment. Angiotensin II receptor blockers (ARBs/sartans) are typically prescribed as an alternative, as they do not cause angioedema.

Emergency Management and Inpatient Care

When angioedema involves the tongue, larynx, or pharynx, there is a risk of airway obstruction – a medical emergency. Essential steps include:

Immediate presentation to an emergency department or activation of emergency services (call 911 or local emergency number)
Securing the airway (intubation or emergency cricothyrotomy if necessary)
Intramuscular adrenaline administration (for allergic angioedema)
Intravenous access and continuous vital sign monitoring
Inpatient observation for at least 24 hours after a severe reaction

References

Zuberbier T, Aberer W, Asero R et al. – The EAACI/GA2LEN/EDF/WAO guideline for the definition, classification, diagnosis and management of urticaria. Allergy. 2022;77(3):734–766.
Cicardi M, Aberer W, Banerji A et al. – Classification, diagnosis, and approach to treatment for angioedema: consensus report from the Hereditary Angioedema International Working Group. Allergy. 2014;69(5):602–616.
Bas M, Greve J, Stelter K et al. – A Randomized Trial of Icatibant in ACE-Inhibitor-Induced Angioedema. New England Journal of Medicine. 2015;372(5):418–425.

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