Dermatologic Manifestations of Hereditary Angioedema Clinical Presentation
- Author: Warren R Heymann, MD; Chief Editor: Dirk M Elston, MD more...
History
Note the following for patient history:
- A family history of hereditary angioedema (HAE) is typically obtained, although spontaneous mutations may occur.
- Symptoms are referable to 3 prominent sites: subcutaneous tissues (face, hands, arms, legs, genitals, and buttocks); abdominal organs (stomach, intestines, bladder, and kidneys), which may manifest as vomiting, diarrhea, or paroxysmal colicky pain and mimic a surgical emergency; and the upper airway (larynx) and tongue, which may result in laryngeal edema and upper airway obstruction.
- Attacks usually occur at a single site, but simultaneous involvement of subcutaneous tissue, viscera, and the larynx is not uncommon. Nonpitting cutaneous swelling is the most commonly reported symptom, and it mainly affects the extremities, the genitalia, and the face. Acute abdominal pain, nausea, and vomiting are the dominant symptoms in 25% of patients with HAE and are rarely seen in people with other forms of angioedema. The lifetime incidence of a laryngeal attack is estimated at 70%.
- Mucosal edema of the bladder or urethra can result in urinary retention, stammering, pain, or anuria.
- Episodes of severe headaches, visual disturbances (eg, blurred vision, diplopia), and ataxia have been reported.
- Cases of painful muscle swelling and unilateral hip or shoulder involvement have also been cited.
- Attacks may be preceded several hours in advance by sudden mood changes, anxiety, sensory changes, or exhaustion.
- Patients often report episodes of swelling worsening over a period of 12-24 hours, usually with resolution within 72 hours. Symptoms can persist for up to 5 days, with migration of swelling to different sites. The edema is usually unresponsive to antihistamines. Attacks are usually periodic and are commonly followed by weeks of remission.
- Pediatric episodes are usually less frequent and commonly manifest as abdominal involvement.
Physical
Physical examination findings may include the following:
- Physical signs of hereditary angioedema (HAE) include overt, noninflammatory swelling of the skin and mucous membranes. Typical involvement includes the face, hands, arms, legs, genitalia, and buttocks, although the edema can localize subcutaneously at any site. Type III HAE patients tend to have more facial attacks.[8] In some patients with severe edema, tension vesicles or bullae may develop.
- In approximately 25% of patients, erythema may precede the occurrence of edema. An estimated 30-50% of patients with HAE reportedly have erythema marginatum preceding or accompanying the attacks. Urticaria is not usually associated with HAE.[9]
- Abdominal examination may reveal signs consistent with acute abdomen or abdominal obstruction. Ascites is often present with an abdominal attack associated with angioedema.
- Mucosal involvement with glossal, pharyngeal, or laryngeal edema may cause respiratory obstruction and signs of distress.
- Additional rare physical findings that have been reported are pleuritic symptoms with pleural effusions, seizures and hemiparesis secondary to cerebral edema, and bladder edema.
Causes
Causes are as follows:
- Precipitating factors of hereditary angioedema (HAE) attacks may include trauma (especially dental trauma), anxiety, menstruation, infection, exercise, alcohol consumption, and stress. Medications (eg, estrogen, ACE inhibitors, angiotensin II type 1 receptor antagonists) have also been shown to induce attacks.[10]
- During pregnancy, symptoms may increase or decrease for HAE types I and II. In HAE type III, studies have reported first episodes or recurrences associated with estrogen-containing oral contraceptives, estrogen replacement therapy, or pregnancy.
- As many as 2% of patients with HAE may have systemic lupus erythematosus. Less commonly, other autoimmune disorders, such as glomerulonephritis, rheumatoid arthritis, thyroiditis, Sjögren syndrome, and pernicious anemia, may be associated with HAE.
- Those HAE patients infected with Helicobacter pylori have been found to be more symptomatic than those who are not infected.
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