What is hereditary angioneurotic edema?

General Discussion. Hereditary angioedema is a rare inherited disorder characterized by recurrent episodes of the accumulation of fluids outside of the blood vessels, blocking the normal flow of blood or lymphatic fluid and causing rapid swelling of tissues in the hands, feet, limbs, face, intestinal tract, or airway.

What is the cause of hereditary angioedema?

Hereditary angioedema (HAE) is caused by a low level or improper function of a protein called the C1 inhibitor. It affects the blood vessels. An HAE attack can result in rapid swelling of the hands, feet, limbs, face, intestinal tract, larynx (voicebox), or trachea (windpipe).

What factor deficiency leads to hereditary angioneurotic edema?

Hereditary angioedema is a disease characterized by deficiency of C1 inhibitor, whereby uncontrolled activation of the kallikreinkinin system leads to excessive bradykinin formation and subsequent angioedema attacks.

Is angioneurotic edema the same as hereditary angioedema?

Angioneurotic edema, hereditary: A genetic form of angioedema. (Angioedema is also referred to as Quinke’s disease.) Persons with it are born lacking an inhibitor protein (called C1 esterase inhibitor) that normally prevents activation of a cascade of proteins leading to the swelling of angioedema.

What are the symptoms of HAE?

The early warning signs of an HAE attack

  • painless, non-itchy rash.
  • tingling skin.
  • skin tightness.
  • fatigue.
  • irritability.
  • sudden mood changes.
  • anxiety.

What is Type 2 HAE?

Disease definition. Hereditary angioedema type 2 (HAE 2) is a form of hereditary angioedema (see this term) characterized by acute edema in subcutaneous tissues, viscera and/or the upper airway.

What are the types of hereditary angioedema?

There are three types of hereditary angioedema, called types I, II, and III, which can be distinguished by their underlying causes and levels of a protein called C1 inhibitor in the blood. The different types have similar signs and symptoms.

What does C1 inhibitor do?

C1-inhibitor (C1-inh, C1 esterase inhibitor) is a protease inhibitor belonging to the serpin superfamily. Its main function is the inhibition of the complement system to prevent spontaneous activation but also as the major regulator of the contact system.

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What is Type 3 angioedema?

Disease definition. Hereditary angioedema type 3 (HAE 3) is a form of hereditary angioedema (see this term) characterized by acute edema in subcutaneous tissues, viscera and/or the upper airway.

How many types of HAE are there?

There are two main types of HAE: type 1 and type 2. The third type, HAE with normal C1 inhibitor, is rare and not fully understood.

Why are C4 levels low in hereditary angioedema?

If a C4 level is found to be low or clinical suspicion of hereditary or acquired angioedema is high, testing of C1-inhibitor (INH) level and function is warranted. C4 levels are often low due to improper handling; therefore, repeating a C4 level when further testing is performed is also advisable.

What is C1 inhibitor deficiency?

Background. Acquired angioedema due to C1-inhibitor (C1-INH) deficiency (AAE-C1-INH) is a serious condition that may result in life-threatening asphyxiation due to laryngeal edema. It is associated with malignant B-cell lymphoma and other disorders.

What is a HAE?

Hereditary angioedema (HAE) is a rare genetic condition that causes swelling under the skin. A certain protein in your body is not in balance. This causes tiny blood vessels to push fluid into nearby areas. That leads to sudden swelling. Although you’ll always have the disease, treatment helps you manage it.

What kind of doctor treats HAE?

Your healthcare team should feature a doctor who has treated HAE, usually an allergist-immunologist. Other specialists who may be on your HAE care team include dermatologists, genetic counselors, OB-GYNs, and gastroenterologists.

What does HAE stand for?


Acronym Definition
HAE High Altitude Endurance
HAE Height Above Ellipsoid
HAE Hitachi Architects & Engineers (Japan)
HAE Host Application Equipment

What HAE looks like?

About 25 percent of people with HAE experience a non-itchy, blotchy red rash that happens before or during an attack. This rash can also appear as red circles.

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How is HAE treated?

In HAE types I and II, the treatment of choice in acute attacks consists of replacement with commercially available C1 inhibitor (C1-INH) concentrates or kallikrein inhibitor or, if those are unavailable, fresh-frozen plasma. In HAE with normal C1 inhibitor levels, infusion of C1-INH has proven to be ineffective.

Is HAE an autoimmune disease?

Occasional reports link HAE with autoimmune conditions and only few studies have been conducted on large patient populations with controversial results. Although several immunoregulatory disorders have been documented, the prevalence of defined autoimmune diseases in patients with HAE remains debated.

Is HAE common?

Hereditary angioedema (HAE) is a rare disease that can typically cause attacks of swelling in the stomach (abdomen), face, feet, genitals, hands, and throat. It is estimated that HAE affects between 1 in 10,000 and 1 in 50,000 people.

What causes low C1 esterase inhibitor?

The main causes of acquired C1-inhibitor deficiency are lymphoproliferative disease and autoimmune disease.

What are the different types of angioedema?

There are four main kinds of angioedema: Allergic, idiopathic, drug-induced, and hereditary.

What type of disease is Hae?

Hereditary angioedema (HAE) is a disease characterized by recurrent episodes (also called attacks) of severe swelling of the skin and mucous membranes. The age at which attacks begin varies, but most people have their first one in childhood or adolescence. The frequency of attacks usually increases after puberty.

What is deficiency in hereditary angioedema?

Hereditary angioedema (HAE) caused by C1-esterase inhibitor deficiency is an autosomal-dominant disease resulting from a mutation in the C1-inhibitor gene[1,2]. Although HAE is an inherited disorder, 25% of cases arise from spontaneous mutations[3].

What autoimmune disease causes angioedema?

In contrast, chronic angioedema with urticaria is most often caused by autoimmune disease, such as Hashimoto’s thyroiditis,10 or drug reactions (eg, NSAIDs).

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What is C1 lab test?

The test checks the level of a substance called C1 esterase inhibitor in your blood. This substance is important in regulating the immune system. A very low level of C1 esterase inhibitor would suggest you have an inherited problem affecting how much of this substance your body is able to produce.

Does C1 inhibitor break down bradykinin?

The C1 inhibitor (C1 INH) is not only the inhibitor of activated C1r and C1s, but it is the key control protein of the plasma bradykinin-forming cascade.

What is the incidence of hereditary angioedema?

Hereditary angioedema is an autosomal dominant genetic disorder characterized by a deficiency in functional C1INH. The condition is thought to affect anywhere between 1 in 10,000 and 1 in 150,000 individuals worldwide, but its rarity makes accurate prevalence estimations difficult.

What is the ICD 10 code for hereditary angioedema?

Patients with at least 1 diagnosis code for C1-INH-HAE including ICD-9-CM 277.6 and 277.8 or ICD-10-D84.

What is idiopathic angioedema?

Idiopathic angioedema is a broad class of angioedema, a type of swelling that can occur anywhere on the body, but most frequently appears around the lips and eyes. Less commonly, the tongue or the mucous membranes of the throat and the mouth can swell which, if severe, can be life-threatening.