Hereditary angioedema Health Article

Definition

Hereditary angioedema is a rare but serious problem with the immune system that is passed down through families. It causes swelling, particularly of the face and airways, and abdominal cramping.

See also: Angioedema

Alternative Names

Quincke's disease

Causes, incidence, and risk factors

Hereditary angioedema (HAE) is caused by low levels or improper function of a protein called C1 inhibitor. This problem affects the blood vessels. People with hereditary angioedema can develop rapid swelling of the hands, feet, limbs, face, intestinal tract, larynx (voicebox), or trachea (windpipe).

There is usually no itching or hives. Swelling of the gut can cause intestinal cramping. If swelling closes the airway, it can be deadly. Attacks of swelling can become more severe in late childhood and adolescence.

There is usually a family history of the condition. However, relatives may be unaware of previous cases, which may have just been reported as an unexpected, sudden, and premature death of a parent, aunt, uncle, or grandparent.

Dental procedures, sickness (including colds and the flu), and surgery have been shown to trigger certain attacks of hereditary angioedema.

Symptoms

• Airway blockage -- involves throat swelling and sudden hoarseness
• Repeat episodes of abdominal cramping without obvious cause
• Swelling in the arms, legs, lips, eyes, tongue, or throat
• Swelling of the intestines -- can be severe and leads to vomiting, dehydration, diarrhea, pain, and occasionally shock

Signs and tests

Blood tests will be done to check the levels of C1 inhibiting factor, C4 and C2.

Treatment

Antihistamines and other related treatments are of limited benefit in hereditary angioedema.

Attenuated androgens, which are derivatives of normal sex hormones, can reduce the frequency and severity of attacks.

Once an attack occurs, treatment includes pain relief and fluids given by an intravenous (IV) line.

Helicobacter pylori, a bacteria found in the stomach, can trigger abdominal attacks. Getting rid of the bacteria with antibiotic therapy decreases these abdominal attacks.

Expectations (prognosis)

Hereditary angioedema can be life threatening and treatment options are limited. How well a person does depends on the individual's specific symptoms.

Complications

Swelling of the airways may be deadly.